2018-01-31T22:42:48.075528Z 0 [Note] Giving 0 client threads a chance to die gracefully
2018-01-31T22:42:48.075571Z 0 [Note] Shutting down slave threads
2018-01-31T22:42:48.075585Z 0 [Note] Forcefully disconnecting 0 remaining clients
2018-01-31T22:42:48.075591Z 0 [Note] Event Scheduler: Purging the queue. 0 events
2018-01-31T22:42:48.079773Z 0 [Note] Binlog end
2018-01-31T22:42:48.086447Z 0 [Note] Shutting down plugin 'auth_pam'
2018-01-31T22:42:48.086493Z 0 [Note] Shutting down plugin 'ngram'
2018-01-31T22:42:48.086498Z 0 [Note] Shutting down plugin 'BLACKHOLE'
2018-01-31T22:42:48.086502Z 0 [Note] Shutting down plugin 'partition'
2018-01-31T22:42:48.086505Z 0 [Note] Shutting down plugin 'ARCHIVE'
2018-01-31T22:42:48.086508Z 0 [Note] Shutting down plugin 'MRG_MYISAM'
2018-01-31T22:42:48.086511Z 0 [Note] Shutting down plugin 'INNODB_SYS_VIRTUAL'
2018-01-31T22:42:48.087509Z 0 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'
2018-01-31T22:42:48.087517Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'
2018-01-31T22:42:48.087520Z 0 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'
2018-01-31T22:42:48.087522Z 0 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'
2018-01-31T22:42:48.087525Z 0 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'
2018-01-31T22:42:48.087527Z 0 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'
2018-01-31T22:42:48.087530Z 0 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'
2018-01-31T22:42:48.087532Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'
2018-01-31T22:42:48.087535Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLES'
2018-01-31T22:42:48.087537Z 0 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'
2018-01-31T22:42:48.087540Z 0 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'
2018-01-31T22:42:48.087542Z 0 [Note] Shutting down plugin 'INNODB_FT_CONFIG'
2018-01-31T22:42:48.087544Z 0 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'
2018-01-31T22:42:48.087547Z 0 [Note] Shutting down plugin 'INNODB_FT_DELETED'
2018-01-31T22:42:48.087549Z 0 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'
2018-01-31T22:42:48.087552Z 0 [Note] Shutting down plugin 'INNODB_METRICS'
2018-01-31T22:42:48.087554Z 0 [Note] Shutting down plugin 'INNODB_TEMP_TABLE_INFO'
2018-01-31T22:42:48.087557Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'
2018-01-31T22:42:48.087559Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'
2018-01-31T22:42:48.087561Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'
2018-01-31T22:42:48.087564Z 0 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'
2018-01-31T22:42:48.087566Z 0 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'
2018-01-31T22:42:48.087569Z 0 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'
2018-01-31T22:42:48.087571Z 0 [Note] Shutting down plugin 'INNODB_CMPMEM'
2018-01-31T22:42:48.087573Z 0 [Note] Shutting down plugin 'INNODB_CMP_RESET'
2018-01-31T22:42:48.087576Z 0 [Note] Shutting down plugin 'INNODB_CMP'
2018-01-31T22:42:48.087578Z 0 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'
2018-01-31T22:42:48.087581Z 0 [Note] Shutting down plugin 'INNODB_LOCKS'
2018-01-31T22:42:48.087583Z 0 [Note] Shutting down plugin 'INNODB_TRX'
2018-01-31T22:42:48.087586Z 0 [Note] Shutting down plugin 'InnoDB'
2018-01-31T22:42:48.087691Z 0 [Note] InnoDB: FTS optimize thread exiting.
2018-01-31T22:42:48.087762Z 0 [Note] InnoDB: Starting shutdown...
2018-01-31T22:42:48.188118Z 0 [Note] InnoDB: Dumping buffer pool(s) to /var/lib/mysql/ib_buffer_pool
2018-01-31T22:42:48.189354Z 0 [Note] InnoDB: Buffer pool(s) dump completed at 180131 23:42:48
2018-01-31T22:42:49.209065Z 0 [Note] InnoDB: Shutdown completed; log sequence number 167214439601
2018-01-31T22:42:49.210903Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:42:49.212607Z 0 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'
2018-01-31T22:42:49.212684Z 0 [Note] Shutting down plugin 'MEMORY'
2018-01-31T22:42:49.212694Z 0 [Note] Shutting down plugin 'CSV'
2018-01-31T22:42:49.212702Z 0 [Note] Shutting down plugin 'MyISAM'
2018-01-31T22:42:49.212713Z 0 [Note] Shutting down plugin 'sha256_password'
2018-01-31T22:42:49.212730Z 0 [Note] Shutting down plugin 'mysql_native_password'
2018-01-31T22:42:49.244716Z 0 [Note] Shutting down plugin 'binlog'
2018-01-31T22:42:49.248102Z 0 [Note] /usr/sbin/mysqld: Shutdown complete

2018-01-31T22:43:13.090403Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:43:13.090443Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:43:13.245638Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:43:13.246577Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 19769 ...
2018-01-31T22:43:13.249911Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:43:13.249933Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:43:13.249937Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:43:13.249941Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:43:13.249944Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:43:13.249947Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:43:13.250187Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:43:13.250307Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:43:13.251730Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:43:13.259341Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:43:13.261744Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:43:13.276817Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:43:13.293824Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:43:13.293886Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:43:13.337822Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:43:13.338644Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:43:13.338654Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:43:13.339204Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:43:13.339350Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:43:13.339478Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:43:13 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f4628332390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f4627804045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f460c06338b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f46276d6830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:43:43.465548Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:43:43.465605Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:43:43.616296Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:43:43.617225Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 19895 ...
2018-01-31T22:43:43.620613Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:43:43.620630Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:43:43.620635Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:43:43.620639Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:43:43.620645Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:43:43.620649Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:43:43.620891Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:43:43.621004Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:43:43.622455Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:43:43.630187Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:43:43.632249Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:43:43.644697Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:43:43.669334Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:43:43.669358Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:43:43.669405Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:43:43.733527Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:43:43.734209Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:43:43.734220Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:43:43.734733Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:43:43.784881Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:43:43.785606Z 0 [Note] Plugin 'FEDERATED' is disabled.
2018-01-31T22:43:43.789442Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
22:43:43 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fd1e7318390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fd1e67ea045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fd1cc04b38b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fd1e66bc830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:44:13.708840Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:44:13.708885Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:44:13.864187Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:44:13.865953Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 2963 ...
2018-01-31T22:44:13.869905Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:44:13.869926Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:44:13.869931Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:44:13.869935Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:44:13.869939Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:44:13.869943Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:44:13.870188Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:44:13.870295Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:44:13.871768Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:44:13.879892Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:44:13.882024Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:44:13.893751Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:44:13.922794Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:44:13.922824Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:44:13.922861Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:44:13.968225Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:44:13.969113Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:44:13.969124Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:44:13.969690Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:44:14.019838Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:44:14.020921Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:44:14.021145Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:44:14 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f606f4a3390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f606e975045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f60541d638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f606e847830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:44:43.964841Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:44:43.964913Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:44:44.118464Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:44:44.119357Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 16727 ...
2018-01-31T22:44:44.122889Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:44:44.122911Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:44:44.122916Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:44:44.122919Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:44:44.122923Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:44:44.122926Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:44:44.123164Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:44:44.123276Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:44:44.124669Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:44:44.132337Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:44:44.134318Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:44:44.145959Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:44:44.161712Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:44:44.161739Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:44:44.161779Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:44:44.218879Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:44:44.219636Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:44:44.219647Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:44:44.220173Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:44:44.270339Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:44:44.270711Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:44:44.270925Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:44:44 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fa5ceb81390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fa5ce053045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fa5b40b538b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fa5cdf25830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:45:14.472187Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:45:14.472260Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:45:14.625122Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:45:14.626731Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 16831 ...
2018-01-31T22:45:14.630835Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:45:14.630857Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:45:14.630862Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:45:14.630865Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:45:14.630869Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:45:14.630873Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:45:14.631111Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:45:14.631225Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:45:14.632640Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:45:14.639958Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:45:14.641961Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:45:14.653900Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:45:14.668909Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:45:14.668935Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:45:14.668974Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:45:14.725691Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:45:14.726943Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:45:14.726961Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:45:14.727714Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:45:14.777950Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:45:14.778282Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:45:14.778981Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:45:14 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7ff4a3820390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7ff4a2cf2045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7ff48801338b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7ff4a2bc4830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:45:44.965025Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:45:44.965095Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:45:45.114013Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:45:45.115468Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 16935 ...
2018-01-31T22:45:45.119289Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:45:45.119306Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:45:45.119310Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:45:45.119314Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:45:45.119318Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:45:45.119321Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:45:45.119551Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:45:45.119656Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:45:45.121007Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:45:45.128067Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:45:45.130552Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:45:45.142827Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:45:45.159614Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:45:45.159640Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:45:45.159676Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:45:45.223583Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:45:45.224848Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:45:45.224867Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:45:45.225757Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:45:45.225889Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:45:45.226204Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:45:45 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f16801d8390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f167f6aa045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f165c5f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f167f57c830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:46:15.460953Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:46:15.461023Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:46:15.617157Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:46:15.618710Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 17038 ...
2018-01-31T22:46:15.622783Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:46:15.622806Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:46:15.622810Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:46:15.622814Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:46:15.622818Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:46:15.622821Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:46:15.623070Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:46:15.623177Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:46:15.624530Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:46:15.631808Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:46:15.633079Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:46:15.645053Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:46:15.662699Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:46:15.662726Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:46:15.662763Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:46:15.717318Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:46:15.718650Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:46:15.718674Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:46:15.719460Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:46:15.769672Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:46:15.770206Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:46:15.770581Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:46:15 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f65d6ad0390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f65d5fa2045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f65bc00438b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f65d5e74830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:46:45.972595Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:46:45.972650Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:46:46.124927Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:46:46.126441Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 17145 ...
2018-01-31T22:46:46.130489Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:46:46.130510Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:46:46.130515Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:46:46.130520Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:46:46.130524Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:46:46.130527Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:46:46.130781Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:46:46.130896Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:46:46.132305Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:46:46.139682Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:46:46.141118Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:46:46.154062Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:46:46.171318Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:46:46.171346Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:46:46.171391Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:46:46.229868Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:46:46.230732Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:46:46.230742Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:46:46.231373Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:46:46.281519Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:46:46.282031Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:46:46.282189Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:46:46 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f8b3fcc5390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f8b3f197045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f8b241f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f8b3f069830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:46:47.484031Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:46:47.484080Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:46:47.636024Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:46:47.637582Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 17206 ...
2018-01-31T22:46:47.641518Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:46:47.641540Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:46:47.641544Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:46:47.641548Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:46:47.641551Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:46:47.641555Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:46:47.641789Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:46:47.641892Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:46:47.643213Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:46:47.650727Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:46:47.652880Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:46:47.664439Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:46:47.678718Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:46:47.678742Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:46:47.678779Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:46:47.725325Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:46:47.726324Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:46:47.726337Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:46:47.726917Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:46:47.777168Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:46:47.777733Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:46:47.777945Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:46:47 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f050ba83390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f050af55045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f04e85f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f050ae27830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:47:17.960499Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:47:17.960554Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:47:18.114228Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:47:18.115770Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 17332 ...
2018-01-31T22:47:18.119180Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:47:18.119200Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:47:18.119205Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:47:18.119209Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:47:18.119212Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:47:18.119216Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:47:18.119450Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:47:18.119558Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:47:18.120942Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:47:18.128230Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:47:18.130206Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:47:18.141907Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:47:18.155949Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:47:18.155974Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:47:18.156010Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:47:18.201463Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:47:18.202181Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:47:18.202191Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:47:18.202762Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:47:18.203128Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:47:18.203133Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:47:18 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f9ba93b4390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f9ba8886045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f9b8c0e338b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f9ba8758830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:47:48.474936Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:47:48.474989Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:47:48.623106Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:47:48.624664Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 17434 ...
2018-01-31T22:47:48.628578Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:47:48.628600Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:47:48.628604Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:47:48.628608Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:47:48.628612Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:47:48.628615Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:47:48.628828Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:47:48.628928Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:47:48.630328Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:47:48.637426Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:47:48.639315Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:47:48.651071Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:47:48.666650Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:47:48.666674Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:47:48.666711Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:47:48.720504Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:47:48.721203Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:47:48.721218Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:47:48.721874Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:47:48.722371Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:47:48.722564Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:47:48 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fbd77abe390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fbd76f90045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fbd545f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fbd76e62830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:48:18.974421Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:48:18.974496Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:48:19.135265Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:48:19.136142Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 17537 ...
2018-01-31T22:48:19.139400Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:48:19.139416Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:48:19.139422Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:48:19.139426Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:48:19.139429Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:48:19.139432Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:48:19.139655Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:48:19.139763Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:48:19.141127Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:48:19.148817Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:48:19.150909Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:48:19.162523Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:48:19.178230Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:48:19.178255Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:48:19.178290Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:48:19.228354Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:48:19.229177Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:48:19.229186Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:48:19.229733Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:48:19.229876Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:48:19.230022Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:48:19 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f60e912b390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f60e85fd045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f60c55f938b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f60e84cf830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:48:49.464848Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:48:49.464914Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:48:49.615187Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:48:49.616681Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 17639 ...
2018-01-31T22:48:49.620669Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:48:49.620690Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:48:49.620695Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:48:49.620699Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:48:49.620703Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:48:49.620708Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:48:49.620953Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:48:49.621057Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:48:49.622450Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:48:49.629913Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:48:49.631930Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:48:49.643515Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:48:49.658572Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:48:49.658598Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:48:49.658637Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:48:49.698317Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:48:49.699105Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:48:49.699115Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:48:49.699637Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:48:49.699798Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:48:49.699994Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:48:49 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f07d1cc0390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f07d1192045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f07b81f638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f07d1064830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:49:19.972315Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:49:19.972367Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:49:20.123455Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:49:20.125041Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 17741 ...
2018-01-31T22:49:20.128340Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:49:20.128358Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:49:20.128362Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:49:20.128372Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:49:20.128376Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:49:20.128379Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:49:20.128611Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:49:20.128722Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:49:20.130094Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:49:20.137643Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:49:20.139512Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:49:20.151198Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:49:20.170184Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:49:20.170208Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:49:20.170245Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:49:20.215578Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:49:20.216860Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:49:20.216881Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:49:20.217843Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:49:20.218020Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:49:20.218358Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:49:20 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f59801ba390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f597f68c045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f595c5f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f597f55e830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:49:50.466131Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:49:50.466201Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:49:50.618143Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:49:50.619760Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 17841 ...
2018-01-31T22:49:50.623957Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:49:50.623977Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:49:50.623984Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:49:50.623988Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:49:50.623991Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:49:50.623995Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:49:50.624243Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:49:50.624356Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:49:50.625828Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:49:50.633840Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:49:50.635904Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:49:50.647538Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:49:50.662836Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:49:50.662860Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:49:50.662909Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:49:50.709022Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:49:50.709997Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:49:50.710008Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:49:50.710519Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:49:50.760666Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:49:50.761025Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:49:50.761246Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:49:50 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fc8ce8b1390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fc8cdd83045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fc8b40a638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fc8cdc55830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:50:20.968746Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:50:20.968806Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:50:21.116780Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:50:21.118380Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 17944 ...
2018-01-31T22:50:21.122091Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:50:21.122109Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:50:21.122112Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:50:21.122116Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:50:21.122119Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:50:21.122122Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:50:21.122345Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:50:21.122447Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:50:21.123916Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:50:21.131419Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:50:21.133313Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:50:21.145226Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:50:21.159352Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:50:21.159376Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:50:21.159412Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:50:21.209228Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:50:21.210026Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:50:21.210038Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:50:21.210583Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:50:21.260782Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:50:21.260949Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:50:21.262707Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:50:21 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fe95eee9390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fe95e3bb045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fe93c33638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fe95e28d830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:50:51.467588Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:50:51.467637Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:50:51.622652Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:50:51.623544Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 18104 ...
2018-01-31T22:50:51.626951Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:50:51.626972Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:50:51.626976Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:50:51.626980Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:50:51.626983Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:50:51.626987Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:50:51.627206Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:50:51.627333Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:50:51.628659Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:50:51.635932Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:50:51.637766Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:50:51.649574Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:50:51.664949Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:50:51.664974Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:50:51.665010Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:50:51.703601Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:50:51.704261Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:50:51.704271Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:50:51.704786Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:50:51.755017Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:50:51.755602Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:50:51.755878Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:50:51 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fac6a38d390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fac6985f045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fac500c238b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fac69731830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:51:21.965309Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:51:21.965375Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:51:22.117956Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:51:22.118921Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 18206 ...
2018-01-31T22:51:22.122776Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:51:22.122795Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:51:22.122800Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:51:22.122804Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:51:22.122808Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:51:22.122812Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:51:22.123071Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:51:22.123183Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:51:22.124705Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:51:22.133148Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:51:22.135268Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:51:22.147209Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:51:22.165656Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:51:22.165683Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:51:22.165722Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:51:22.215385Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:51:22.216093Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:51:22.216103Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:51:22.216637Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:51:22.266852Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:51:22.267111Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:51:22.267440Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:51:22 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7ff475959390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7ff474e2b045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7ff4545f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7ff474cfd830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:51:52.464312Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:51:52.464371Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:51:52.614894Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:51:52.615784Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 18307 ...
2018-01-31T22:51:52.619088Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:51:52.619116Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:51:52.619120Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:51:52.619124Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:51:52.619127Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:51:52.619131Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:51:52.619352Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:51:52.619485Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:51:52.620833Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:51:52.628243Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:51:52.630127Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:51:52.642351Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:51:52.660456Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:51:52.660480Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:51:52.660512Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:51:52.714847Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:51:52.715588Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:51:52.715596Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:51:52.716207Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:51:52.716419Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:51:52.716523Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:51:52 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f1668b7b390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f166804d045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f164c0ab38b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f1667f1f830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:52:22.966162Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:52:22.966245Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:52:23.115723Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:52:23.116666Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 18411 ...
2018-01-31T22:52:23.120104Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:52:23.120125Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:52:23.120129Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:52:23.120132Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:52:23.120136Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:52:23.120139Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:52:23.120364Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:52:23.120469Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:52:23.121925Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:52:23.129269Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:52:23.131226Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:52:23.143120Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:52:23.158265Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:52:23.158289Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:52:23.158328Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:52:23.199108Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:52:23.199797Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:52:23.199806Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:52:23.200295Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:52:23.250546Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:52:23.250724Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:52:23.251180Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:52:23 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7ff662f2e390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7ff662400045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7ff64033638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7ff6622d2830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:52:37.013426Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:52:37.013483Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:52:37.164174Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:52:37.165782Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 18495 ...
2018-01-31T22:52:37.169287Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:52:37.169311Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:52:37.169316Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:52:37.169320Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:52:37.169326Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:52:37.169330Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:52:37.169589Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:52:37.169700Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:52:37.171139Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:52:37.178974Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:52:37.180882Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:52:37.192640Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:52:37.207072Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:52:37.207098Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:52:37.207136Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:52:37.250800Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:52:37.252072Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:52:37.252090Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:52:37.252904Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:52:37.253007Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:52:37.253338Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:52:37 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f6abdbc2390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f6abd094045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f6aa40f838b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f6abcf66830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:53:07.462642Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:53:07.462709Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:53:07.614612Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:53:07.616156Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 18623 ...
2018-01-31T22:53:07.620248Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:53:07.620267Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:53:07.620271Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:53:07.620275Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:53:07.620278Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:53:07.620282Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:53:07.620502Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:53:07.620611Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:53:07.621978Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:53:07.629182Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:53:07.631571Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:53:07.643153Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:53:07.657269Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:53:07.657293Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:53:07.657332Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:53:07.708502Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:53:07.709226Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:53:07.709237Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:53:07.709775Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:53:07.759998Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:53:07.760195Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:53:07.760890Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:53:07 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f578f9d9390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f578eeab045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f576c5f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f578ed7d830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:53:37.966066Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:53:37.966118Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:53:38.116753Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:53:38.118311Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 18728 ...
2018-01-31T22:53:38.122290Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:53:38.122311Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:53:38.122316Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:53:38.122319Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:53:38.122323Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:53:38.122326Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:53:38.122547Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:53:38.122651Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:53:38.123960Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:53:38.131428Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:53:38.133404Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:53:38.145325Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:53:38.163577Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:53:38.163603Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:53:38.163639Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:53:38.216168Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:53:38.217186Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:53:38.217196Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:53:38.217733Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:53:38.267918Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:53:38.268471Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:53:38.268620Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:53:38 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f5da2e7f390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f5da2351045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f5d8033638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f5da2223830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:53:59.775682Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:53:59.775733Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:53:59.922377Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:53:59.923260Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 18912 ...
2018-01-31T22:53:59.926563Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:53:59.926581Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:53:59.926585Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:53:59.926589Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:53:59.926592Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:53:59.926595Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:53:59.926845Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:53:59.926947Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:53:59.928311Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:53:59.935663Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:53:59.937740Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:53:59.949462Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:53:59.965237Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:53:59.965278Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:53:59.965324Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:54:00.010557Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:54:00.011216Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:54:00.011226Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:54:00.011764Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:54:00.061982Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:54:00.062538Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:54:00.062899Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:54:00 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fe82a726390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fe829bf8045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fe80833638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fe829aca830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:54:30.211085Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:54:30.211135Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:54:30.364136Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:54:30.365757Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 19038 ...
2018-01-31T22:54:30.369763Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:54:30.369779Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:54:30.369783Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:54:30.369788Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:54:30.369792Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:54:30.369795Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:54:30.370024Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:54:30.370138Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:54:30.371535Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:54:30.378611Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:54:30.380521Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:54:30.392177Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:54:30.406531Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:54:30.406553Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:54:30.406589Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:54:30.451943Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:54:30.453591Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:54:30.453612Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:54:30.454441Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:54:30.454587Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:54:30.454921Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:54:30 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fef5c232390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fef5b704045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fef385f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fef5b5d6830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:55:00.712933Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:55:00.713010Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:55:00.864368Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:55:00.865926Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 19140 ...
2018-01-31T22:55:00.869874Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:55:00.869892Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:55:00.869896Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:55:00.869900Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:55:00.869903Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:55:00.869907Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:55:00.870134Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:55:00.870240Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:55:00.871591Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:55:00.878911Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:55:00.880829Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:55:00.892633Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:55:00.909654Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:55:00.909680Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:55:00.909731Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:55:00.968925Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:55:00.969978Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:55:00.969990Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:55:00.970580Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:55:01.020748Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:55:01.021248Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:55:01.021425Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:55:01 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f729bab1390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f729af83045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f72785f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f729ae55830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:55:30.955749Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:55:30.955796Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:55:31.103078Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:55:31.103980Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 19242 ...
2018-01-31T22:55:31.107352Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:55:31.107372Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:55:31.107376Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:55:31.107380Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:55:31.107384Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:55:31.107387Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:55:31.107644Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:55:31.107748Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:55:31.109142Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:55:31.116533Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:55:31.118480Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:55:31.130196Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:55:31.145279Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:55:31.145304Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:55:31.145341Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:55:31.211703Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:55:31.212448Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:55:31.212458Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:55:31.213065Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:55:31.263240Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:55:31.263637Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:55:31.263855Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:55:31 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f6e6213a390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f6e6160c045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f6e405f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f6e614de830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:56:01.213184Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:56:01.213227Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:56:01.361989Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:56:01.363531Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 19345 ...
2018-01-31T22:56:01.366971Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:56:01.366987Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:56:01.366992Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:56:01.366998Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:56:01.367001Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:56:01.367005Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:56:01.367229Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:56:01.367335Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:56:01.368691Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:56:01.375897Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:56:01.377928Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:56:01.389649Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:56:01.403562Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:56:01.403587Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:56:01.403629Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:56:01.465892Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:56:01.466971Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:56:01.466990Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:56:01.467711Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:56:01.517900Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:56:01.518378Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:56:01.518588Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:56:01 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f5963db6390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f5963288045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f59482e838b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f596315a830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:56:31.705753Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:56:31.705797Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:56:31.854936Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:56:31.855840Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 19448 ...
2018-01-31T22:56:31.859195Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:56:31.859211Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:56:31.859215Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:56:31.859219Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:56:31.859224Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:56:31.859235Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:56:31.859466Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:56:31.859573Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:56:31.860911Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:56:31.868271Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:56:31.870192Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:56:31.881991Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:56:31.899987Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:56:31.900012Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:56:31.900045Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:56:31.952344Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:56:31.953452Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:56:31.953465Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:56:31.953985Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:56:32.004192Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:56:32.004778Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:56:32.005068Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:56:32 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f6dfe332390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f6dfd804045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f6de406738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f6dfd6d6830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:56:48.593705Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:56:48.593772Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:56:48.743148Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:56:48.744681Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 19625 ...
2018-01-31T22:56:48.748528Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:56:48.748551Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:56:48.748555Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:56:48.748558Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:56:48.748561Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:56:48.748566Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:56:48.748795Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:56:48.748908Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:56:48.750269Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:56:48.757585Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:56:48.759696Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:56:48.771203Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:56:48.793590Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:56:48.793615Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:56:48.793649Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:56:48.918330Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:56:48.919592Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:56:48.919608Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:56:48.920510Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:56:48.920641Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:56:48.920813Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:56:48 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fe0aceb5390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fe0ac387045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fe08933838b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fe0ac259830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:57:18.967842Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:57:18.967895Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:57:19.116910Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:57:19.117907Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 19750 ...
2018-01-31T22:57:19.121581Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:57:19.121600Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:57:19.121605Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:57:19.121609Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:57:19.121612Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:57:19.121616Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:57:19.121884Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:57:19.122003Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:57:19.123574Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:57:19.131562Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:57:19.133629Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:57:19.145430Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:57:19.161887Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:57:19.161914Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:57:19.161953Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:57:19.209547Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:57:19.210783Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:57:19.210800Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:57:19.211731Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:57:19.211889Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:57:19.212230Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:57:19 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fa3c5d1f390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fa3c51f1045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fa3ac25538b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fa3c50c3830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:57:49.468180Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:57:49.468231Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:57:49.622701Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:57:49.623596Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 19853 ...
2018-01-31T22:57:49.626890Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:57:49.626910Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:57:49.626917Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:57:49.626921Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:57:49.626924Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:57:49.626928Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:57:49.627146Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:57:49.627256Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:57:49.628547Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:57:49.635852Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:57:49.637709Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:57:49.649275Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:57:49.664085Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:57:49.664117Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:57:49.664159Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:57:49.727976Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:57:49.729234Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:57:49.729252Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:57:49.730094Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:57:49.780344Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:57:49.780567Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:57:49.780933Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:57:49 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fba2d0f0390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fba2c5c2045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fba095f938b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fba2c494830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:58:19.967032Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:58:19.967096Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:58:20.116434Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:58:20.117958Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 19956 ...
2018-01-31T22:58:20.122007Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:58:20.122026Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:58:20.122031Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:58:20.122035Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:58:20.122044Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:58:20.122048Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:58:20.122281Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:58:20.122400Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:58:20.123839Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:58:20.131138Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:58:20.133092Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:58:20.144817Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:58:20.164933Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:58:20.164959Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:58:20.164999Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:58:20.224050Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:58:20.224746Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:58:20.224756Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:58:20.225368Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:58:20.225829Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:58:20.225987Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:58:20 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f08379eb390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f0836ebd045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f08145f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f0836d8f830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:58:46.129761Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:58:46.129804Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:58:46.282190Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:58:46.283083Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 20191 ...
2018-01-31T22:58:46.286236Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:58:46.286253Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:58:46.286257Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:58:46.286261Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:58:46.286264Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:58:46.286267Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:58:46.286508Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:58:46.286613Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:58:46.288029Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:58:46.295484Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:58:46.297505Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:58:46.309232Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:58:46.326401Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:58:46.326424Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:58:46.326458Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:58:46.369078Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:58:46.369820Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:58:46.369831Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:58:46.370489Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:58:46.370885Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:58:46.371034Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:58:46 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f334210f390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f33415e1045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f33205f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f33414b3830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:59:16.478079Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:59:16.478124Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:59:16.634063Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:59:16.635655Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 20296 ...
2018-01-31T22:59:16.639676Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:59:16.639692Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:59:16.639697Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:59:16.639700Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:59:16.639704Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:59:16.639708Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:59:16.639961Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:59:16.640073Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:59:16.641470Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:59:16.649256Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:59:16.651789Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:59:16.663490Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:59:16.677930Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:59:16.677959Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:59:16.677997Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:59:16.734508Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:59:16.735185Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:59:16.735198Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:59:16.735684Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T22:59:16.785872Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:59:16.786432Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:59:16 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f17273d7390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f17268a9045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f170c10a38b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f172677b830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T22:59:46.962533Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T22:59:46.962592Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T22:59:47.117278Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T22:59:47.118873Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 20424 ...
2018-01-31T22:59:47.122121Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T22:59:47.122139Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T22:59:47.122144Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T22:59:47.122147Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T22:59:47.122151Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T22:59:47.122154Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T22:59:47.122374Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T22:59:47.122477Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T22:59:47.123832Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T22:59:47.131088Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T22:59:47.132981Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T22:59:47.145869Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T22:59:47.161445Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T22:59:47.161469Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T22:59:47.161505Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T22:59:47.201260Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T22:59:47.201931Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T22:59:47.201941Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T22:59:47.202466Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T22:59:47.202649Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T22:59:47.202801Z 0 [Note] Plugin 'FEDERATED' is disabled.
22:59:47 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fbef01b7390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fbeef689045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fbecc5f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fbeef55b830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:00:17.465191Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:00:17.465241Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:00:17.616820Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:00:17.618445Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 20572 ...
2018-01-31T23:00:17.622389Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:00:17.622404Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:00:17.622409Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:00:17.622414Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:00:17.622417Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:00:17.622421Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:00:17.622644Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:00:17.622785Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:00:17.624196Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:00:17.631963Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:00:17.634040Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:00:17.645904Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:00:17.670936Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:00:17.670967Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:00:17.671016Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:00:17.953644Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:00:17.954360Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:00:17.954371Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:00:17.954880Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:00:18.005031Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:00:18.005456Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:00:18.005619Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:00:18 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fafc65b3390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fafc5a85045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fafac2e838b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fafc5957830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:00:47.964155Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:00:47.964221Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:00:48.115041Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:00:48.116500Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 20672 ...
2018-01-31T23:00:48.120599Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:00:48.120617Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:00:48.120622Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:00:48.120625Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:00:48.120629Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:00:48.120633Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:00:48.120859Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:00:48.120965Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:00:48.122368Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:00:48.129603Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:00:48.131623Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:00:48.144615Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:00:48.160484Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:00:48.160508Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:00:48.160543Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:00:48.218576Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:00:48.219257Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:00:48.219272Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:00:48.219820Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:00:48.219953Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:00:48.220075Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:00:48 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f4a87fee390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f4a874c0045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f4a6433638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f4a87392830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:01:18.459657Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:01:18.459725Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:01:18.615610Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:01:18.616515Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 20773 ...
2018-01-31T23:01:18.619996Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:01:18.620014Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:01:18.620018Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:01:18.620022Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:01:18.620025Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:01:18.620028Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:01:18.620273Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:01:18.620381Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:01:18.621746Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:01:18.629057Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:01:18.630939Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:01:18.642839Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:01:18.657516Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:01:18.657541Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:01:18.657576Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:01:18.703688Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:01:18.704933Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:01:18.704951Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:01:18.705844Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:01:18.705973Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:01:18.706319Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:01:18 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fc508770390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fc507c42045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fc4e4b3738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fc507b14830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:01:48.959556Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:01:48.959611Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:01:49.114350Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:01:49.115796Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 20876 ...
2018-01-31T23:01:49.119627Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:01:49.119644Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:01:49.119648Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:01:49.119652Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:01:49.119655Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:01:49.119659Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:01:49.119878Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:01:49.119986Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:01:49.121324Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:01:49.128361Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:01:49.129616Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:01:49.141121Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:01:49.154667Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:01:49.154690Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:01:49.154724Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:01:49.208109Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:01:49.208815Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:01:49.208824Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:01:49.209323Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:01:49.259509Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:01:49.259954Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:01:49.260109Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:01:49 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f29364de390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f29359b0045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f291c21338b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f2935882830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:02:19.464585Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:02:19.464645Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:02:19.618019Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:02:19.619558Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 20976 ...
2018-01-31T23:02:19.623411Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:02:19.623427Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:02:19.623431Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:02:19.623435Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:02:19.623438Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:02:19.623441Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:02:19.623657Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:02:19.623775Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:02:19.625162Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:02:19.632702Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:02:19.634698Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:02:19.646812Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:02:19.662769Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:02:19.662794Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:02:19.662830Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:02:19.720827Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:02:19.722120Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:02:19.722140Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:02:19.722963Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:02:19.723148Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:02:19.723468Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:02:19 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f8649c10390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f86490e2045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f863014638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f8648fb4830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:02:49.962666Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:02:49.962724Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:02:50.114981Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:02:50.115896Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 21080 ...
2018-01-31T23:02:50.119163Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:02:50.119179Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:02:50.119185Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:02:50.119189Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:02:50.119193Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:02:50.119196Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:02:50.119420Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:02:50.119525Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:02:50.120865Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:02:50.127945Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:02:50.129772Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:02:50.142694Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:02:50.158256Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:02:50.158281Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:02:50.158318Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:02:50.204464Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:02:50.205205Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:02:50.205214Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:02:50.205751Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:02:50.255968Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:02:50.256126Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:02:50.256298Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:02:50 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f6c0137f390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f6c00851045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f6be40ae38b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f6c00723830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:03:20.466960Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:03:20.467006Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:03:20.616661Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:03:20.618366Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 21180 ...
2018-01-31T23:03:20.622023Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:03:20.622042Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:03:20.622047Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:03:20.622051Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:03:20.622055Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:03:20.622061Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:03:20.622298Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:03:20.622411Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:03:20.623877Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:03:20.631781Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:03:20.633897Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:03:20.646181Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:03:20.661782Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:03:20.661824Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:03:20.661863Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:03:20.698688Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:03:20.699404Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:03:20.699415Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:03:20.700035Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:03:20.750256Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:03:20.750853Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:03:20.751144Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:03:20 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f55839be390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f5582e90045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f55605f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f5582d62830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:03:50.968303Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:03:50.968356Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:03:51.117483Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:03:51.118412Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 21281 ...
2018-01-31T23:03:51.121974Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:03:51.121992Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:03:51.121998Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:03:51.122003Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:03:51.122007Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:03:51.122011Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:03:51.122248Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:03:51.122360Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:03:51.123772Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:03:51.131406Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:03:51.133492Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:03:51.145147Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:03:51.162630Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:03:51.162656Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:03:51.162693Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:03:51.217203Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:03:51.218490Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:03:51.218510Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:03:51.219258Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:03:51.269481Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:03:51.269701Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:03:51.270041Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:03:51 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f9ad4f17390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f9ad43e9045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f9ab133838b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f9ad42bb830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:04:21.468807Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:04:21.468851Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:04:21.615864Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:04:21.616887Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 21383 ...
2018-01-31T23:04:21.620370Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:04:21.620387Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:04:21.620391Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:04:21.620394Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:04:21.620398Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:04:21.620401Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:04:21.620636Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:04:21.620753Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:04:21.622149Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:04:21.630250Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:04:21.632238Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:04:21.643941Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:04:21.658392Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:04:21.658418Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:04:21.658456Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:04:21.717147Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:04:21.717833Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:04:21.717842Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:04:21.718370Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:04:21.718597Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:04:21.718774Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:04:21 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f1891d57390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f1891229045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f187828d38b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f18910fb830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:04:51.964852Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:04:51.964910Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:04:52.116184Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:04:52.117738Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 21486 ...
2018-01-31T23:04:52.120973Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:04:52.120994Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:04:52.120998Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:04:52.121002Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:04:52.121006Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:04:52.121016Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:04:52.121248Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:04:52.121351Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:04:52.122680Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:04:52.129907Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:04:52.131752Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:04:52.143634Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:04:52.162179Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:04:52.162203Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:04:52.162236Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:04:52.218032Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:04:52.219290Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:04:52.219308Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:04:52.220111Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:04:52.220398Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:04:52.220616Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:04:52 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fb7c13cc390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fb7c089e045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fb7a40fb38b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fb7c0770830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:05:22.461499Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:05:22.461550Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:05:22.614736Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:05:22.616305Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 21610 ...
2018-01-31T23:05:22.619577Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:05:22.619593Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:05:22.619597Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:05:22.619608Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:05:22.619612Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:05:22.619615Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:05:22.619863Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:05:22.619973Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:05:22.621363Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:05:22.628496Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:05:22.630495Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:05:22.642462Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:05:22.658335Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:05:22.658358Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:05:22.658395Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:05:22.718188Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:05:22.719464Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:05:22.719481Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:05:22.720248Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:05:22.770467Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:05:22.770681Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:05:22.770839Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:05:22 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fe83d5b3390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fe83ca85045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fe81c13138b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fe83c957830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:06:06.740183Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:06:06.742285Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:06:06.909028Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:06:06.913442Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 1212 ...
2018-01-31T23:06:06.994119Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:06:06.994149Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:06:06.994156Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:06:06.994166Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:06:06.994170Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:06:06.994174Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:06:07.013848Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:06:07.035819Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:06:07.037317Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:06:07.060597Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:06:07.068026Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:06:07.101585Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:06:07.346956Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:06:07.346984Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:06:07.347024Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:06:07.413742Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:06:07.415297Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:06:07.415323Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:06:07.416266Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:06:07.417226Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:06:07.422412Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:06:07 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f2386b3b390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f238600d045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f236c06f38b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f2385edf830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:06:37.054864Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:06:37.054911Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:06:37.214280Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:06:37.215160Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 1728 ...
2018-01-31T23:06:37.218616Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:06:37.218636Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:06:37.218640Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:06:37.218644Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:06:37.218648Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:06:37.218651Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:06:37.218881Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:06:37.218988Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:06:37.220339Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:06:37.227986Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:06:37.229933Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:06:37.241593Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:06:37.264518Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:06:37.264541Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:06:37.264580Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:06:37.316941Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:06:37.317640Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:06:37.317652Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:06:37.318238Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:06:37.318396Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:06:37.318495Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:06:37 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fb287fab390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fb28747d045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fb26433638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fb28734f830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:07:07.565380Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:07:07.565429Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:07:07.720737Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:07:07.722323Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 1871 ...
2018-01-31T23:07:07.726341Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:07:07.726360Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:07:07.726365Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:07:07.726369Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:07:07.726373Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:07:07.726376Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:07:07.726611Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:07:07.726717Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:07:07.728120Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:07:07.735901Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:07:07.737846Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:07:07.749471Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:07:07.766571Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:07:07.766597Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:07:07.766633Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:07:07.823914Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:07:07.824620Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:07:07.824629Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:07:07.825173Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:07:07.875386Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:07:07.876242Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:07:07.876481Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:07:07 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f5cf64b5390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f5cf5987045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f5cdc1ea38b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f5cf5859830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:07:38.062381Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:07:38.062438Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:07:38.210158Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:07:38.211580Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 1971 ...
2018-01-31T23:07:38.215687Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:07:38.215703Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:07:38.215708Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:07:38.215711Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:07:38.215715Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:07:38.215720Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:07:38.215958Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:07:38.216062Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:07:38.217397Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:07:38.224520Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:07:38.226483Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:07:38.238070Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:07:38.253141Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:07:38.253164Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:07:38.253198Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:07:38.302251Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:07:38.302958Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:07:38.302968Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:07:38.303516Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:07:38.353696Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:07:38.354141Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:07:38.354229Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:07:38 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fa175fd5390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fa1754a7045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fa15433638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fa175379830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:08:08.565932Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:08:08.565990Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:08:08.719839Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:08:08.721277Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 2072 ...
2018-01-31T23:08:08.725024Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:08:08.725040Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:08:08.725045Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:08:08.725049Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:08:08.725053Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:08:08.725056Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:08:08.725277Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:08:08.725378Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:08:08.726688Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:08:08.734086Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:08:08.735960Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:08:08.747453Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:08:08.761882Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:08:08.761905Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:08:08.761941Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:08:08.820956Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:08:08.821904Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:08:08.821914Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:08:08.822436Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:08:08.872598Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:08:08.873035Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:08:08.873196Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:08:08 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f6f3f499390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f6f3e96b045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f6f241cc38b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f6f3e83d830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:08:39.060839Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:08:39.060893Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:08:39.210979Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:08:39.212412Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 2287 ...
2018-01-31T23:08:39.216184Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:08:39.216199Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:08:39.216203Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:08:39.216208Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:08:39.216212Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:08:39.216216Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:08:39.216437Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:08:39.216540Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:08:39.217868Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:08:39.224863Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:08:39.226656Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:08:39.238766Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:08:39.252609Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:08:39.252634Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:08:39.252670Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:08:39.293769Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:08:39.294581Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:08:39.294595Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:08:39.295187Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:08:39.345371Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:08:39.345935Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:08:39.346093Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:08:39 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f96420e1390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f96415b3045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f96205f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f9641485830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:08:49.808254Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:08:49.808307Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:08:49.961435Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:08:49.962418Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 2355 ...
2018-01-31T23:08:49.966088Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:08:49.966110Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:08:49.966115Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:08:49.966119Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:08:49.966123Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:08:49.966126Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:08:49.966373Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:08:49.966486Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:08:49.967981Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:08:49.975908Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:08:49.978053Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:08:49.989861Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:08:50.005416Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:08:50.005444Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:08:50.005483Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:08:50.050287Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:08:50.051568Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:08:50.051588Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:08:50.052515Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:08:50.052680Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:08:50.053001Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:08:50 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7ff318da2390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7ff318274045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7ff2fc2d238b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7ff318146830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:09:20.314239Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:09:20.314281Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:09:20.471008Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:09:20.472527Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 2497 ...
2018-01-31T23:09:20.476488Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:09:20.476503Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:09:20.476508Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:09:20.476512Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:09:20.476516Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:09:20.476519Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:09:20.476735Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:09:20.476836Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:09:20.478177Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:09:20.485351Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:09:20.487236Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:09:20.498951Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:09:20.513758Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:09:20.513783Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:09:20.513819Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:09:20.557240Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:09:20.558923Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:09:20.558947Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:09:20.559664Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:09:20.609845Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:09:20.610117Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:09:20.610271Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:09:20 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fadf0c92390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fadf0164045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fadd41c238b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fadf0036830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:09:50.809655Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:09:50.809702Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:09:50.959158Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:09:50.960651Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 2600 ...
2018-01-31T23:09:50.964325Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:09:50.964342Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:09:50.964346Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:09:50.964350Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:09:50.964353Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:09:50.964356Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:09:50.964570Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:09:50.964667Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:09:50.966013Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:09:50.972955Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:09:50.974797Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:09:50.986370Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:09:50.999918Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:09:50.999940Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:09:50.999974Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:09:51.047971Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:09:51.049104Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:09:51.049115Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:09:51.049726Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:09:51.099914Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:09:51.100359Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:09:51.100587Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:09:51 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f5b3a62a390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f5b39afc045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f5b1833638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f5b399ce830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:10:21.053954Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:10:21.053996Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:10:21.212220Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:10:21.213709Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 2763 ...
2018-01-31T23:10:21.217747Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:10:21.217765Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:10:21.217769Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:10:21.217775Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:10:21.217779Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:10:21.217782Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:10:21.218015Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:10:21.218121Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:10:21.219498Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:10:21.226849Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:10:21.228778Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:10:21.240389Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:10:21.256898Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:10:21.256932Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:10:21.256983Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:10:21.323018Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:10:21.323975Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:10:21.323988Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:10:21.324576Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:10:21.374714Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:10:21.375134Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:10:21.375335Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:10:21 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7faa8bc38390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7faa8b10a045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7faa7016a38b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7faa8afdc830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:10:51.558593Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:10:51.558666Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:10:51.709360Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:10:51.710252Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 2866 ...
2018-01-31T23:10:51.713543Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:10:51.713558Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:10:51.713562Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:10:51.713601Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:10:51.713609Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:10:51.713615Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:10:51.713835Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:10:51.713934Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:10:51.715197Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:10:51.725597Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:10:51.729040Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:10:51.740778Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:10:51.755308Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:10:51.755334Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:10:51.755372Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:10:51.812890Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:10:51.814191Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:10:51.814211Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:10:51.815030Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:10:51.815523Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:10:51.815849Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:10:51 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f49223a4390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f4921876045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f49080d938b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f4921748830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:11:22.060586Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:11:22.060639Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:11:22.210898Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:11:22.211811Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 2967 ...
2018-01-31T23:11:22.215183Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:11:22.215200Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:11:22.215204Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:11:22.215208Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:11:22.215212Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:11:22.215215Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:11:22.215439Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:11:22.215541Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:11:22.216895Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:11:22.224231Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:11:22.226206Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:11:22.237882Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:11:22.252017Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:11:22.252050Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:11:22.252088Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:11:22.299341Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:11:22.300022Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:11:22.300033Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:11:22.300647Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:11:22.300825Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:11:22.301053Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:11:22 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f3a8c386390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f3a8b858045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f3a700b738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f3a8b72a830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:11:52.570810Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:11:52.570860Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:11:52.718910Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:11:52.720380Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 3070 ...
2018-01-31T23:11:52.724322Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:11:52.724340Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:11:52.724344Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:11:52.724348Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:11:52.724351Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:11:52.724355Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:11:52.724573Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:11:52.724674Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:11:52.726058Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:11:52.733730Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:11:52.735558Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:11:52.747222Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:11:52.763060Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:11:52.763084Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:11:52.763120Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:11:52.814055Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:11:52.814718Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:11:52.814729Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:11:52.815208Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:11:52.865338Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:11:52.865831Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:11:52.866380Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:11:52 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fbd022c0390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fbd01792045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fbce05f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fbd01664830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:12:23.064610Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:12:23.064665Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:12:23.211720Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:12:23.213192Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 3171 ...
2018-01-31T23:12:23.217056Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:12:23.217073Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:12:23.217077Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:12:23.217080Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:12:23.217084Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:12:23.217087Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:12:23.217305Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:12:23.217433Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:12:23.218822Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:12:23.226430Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:12:23.228322Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:12:23.239799Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:12:23.253889Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:12:23.253914Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:12:23.253949Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:12:23.305613Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:12:23.306522Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:12:23.306532Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:12:23.307112Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:12:23.357304Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:12:23.357489Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:12:23.358178Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:12:23 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f7477aab390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f7476f7d045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f74545f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f7476e4f830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:12:53.568189Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:12:53.568243Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:12:53.721769Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:12:53.723272Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 3272 ...
2018-01-31T23:12:53.727571Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:12:53.727594Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:12:53.727598Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:12:53.727602Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:12:53.727606Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:12:53.727620Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:12:53.727868Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:12:53.727983Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:12:53.729377Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:12:53.736720Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:12:53.738070Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:12:53.749859Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:12:53.766831Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:12:53.766856Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:12:53.766890Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:12:53.813535Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:12:53.814821Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:12:53.814840Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:12:53.815735Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:12:53.815888Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:12:53.816237Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:12:53 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fc39c2c4390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fc39b796045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fc3785f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fc39b668830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:13:24.063346Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:13:24.063396Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:13:24.211522Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:13:24.212383Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 3373 ...
2018-01-31T23:13:24.215683Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:13:24.215704Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:13:24.215708Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:13:24.215719Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:13:24.215723Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:13:24.215726Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:13:24.215949Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:13:24.216057Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:13:24.217397Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:13:24.225022Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:13:24.226960Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:13:24.240136Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:13:24.255357Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:13:24.255396Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:13:24.255434Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:13:24.290538Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:13:24.291186Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:13:24.291195Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:13:24.291713Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:13:24.293941Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:13:24 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fe81574d390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7fe814c1f045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7fe7f433638b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fe814af1830]
2018-01-31T23:13:24.301595Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:13:54.312702Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:13:54.312749Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:13:54.458051Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:13:54.458913Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 3474 ...
2018-01-31T23:13:54.462222Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:13:54.462238Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:13:54.462242Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:13:54.462247Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:13:54.462251Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:13:54.462254Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:13:54.462484Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:13:54.462591Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:13:54.463903Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:13:54.471170Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:13:54.473112Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:13:54.484599Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:13:54.498683Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:13:54.498712Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:13:54.498758Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:13:54.553425Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:13:54.554153Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:13:54.554165Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:13:54.554678Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:13:54.604833Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:13:54.605059Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:13:54.605171Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:13:54 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f7f95b81390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f7f95053045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f7f7c0b738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f7f94f25830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:14:24.807766Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:14:24.807809Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:14:24.958046Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:14:24.959601Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 3743 ...
2018-01-31T23:14:24.962871Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:14:24.962889Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:14:24.962893Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:14:24.962896Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:14:24.962900Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:14:24.962903Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:14:24.963116Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:14:24.963215Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:14:24.964519Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:14:24.972099Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:14:24.973984Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:14:24.985516Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:14:25.006366Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:14:25.006394Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:14:25.006432Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:14:25.051697Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:14:25.052393Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:14:25.052403Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:14:25.052978Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:14:25.103135Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:14:25.103513Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:14:25.103760Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:14:25 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f33529b0390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7f3351e82045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7f33305f738b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f3351d54830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
2018-01-31T23:14:55.066207Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-01-31T23:14:55.066271Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2018-01-31T23:14:55.217858Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-01-31T23:14:55.219339Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 4097 ...
2018-01-31T23:14:55.223509Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-01-31T23:14:55.223528Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-01-31T23:14:55.223532Z 0 [Note] InnoDB: Uses event mutexes
2018-01-31T23:14:55.223536Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-01-31T23:14:55.223540Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-01-31T23:14:55.223544Z 0 [Note] InnoDB: Using Linux native AIO
2018-01-31T23:14:55.223765Z 0 [Note] InnoDB: Number of pools: 1
2018-01-31T23:14:55.223867Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-01-31T23:14:55.225312Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-01-31T23:14:55.232464Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-01-31T23:14:55.234319Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-01-31T23:14:55.245778Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-01-31T23:14:55.259750Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-01-31T23:14:55.259773Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-01-31T23:14:55.259807Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-01-31T23:14:55.308307Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-01-31T23:14:55.309051Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-01-31T23:14:55.309061Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-01-31T23:14:55.309560Z 0 [Note] InnoDB: Waiting for purge to start
2018-01-31T23:14:55.359716Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 167214439601
2018-01-31T23:14:55.360070Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-01-31T23:14:55.360262Z 0 [Note] Plugin 'FEDERATED' is disabled.
23:14:55 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 76385 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3b)[0xe8f29b]
/usr/sbin/mysqld(handle_fatal_signal+0x489)[0x787029]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7feb9edd5390]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e045)[0x7feb9e2a7045]
/usr/sbin/mysqld(_Z22find_or_create_programP10PFS_thread16enum_object_typePKcjS3_j+0x439)[0x11ccee9]
/usr/lib/mysql/plugin/auth_pam.so(+0x238b)[0x7feb8430938b]
/usr/sbin/mysqld[0xc70134]
/usr/sbin/mysqld[0xc766ef]
/usr/sbin/mysqld(_Z36plugin_register_dynamic_and_init_allPiPPci+0xf6)[0xc782e6]
/usr/sbin/mysqld[0x77f4bb]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xa29)[0x780e49]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7feb9e179830]
/usr/sbin/mysqld(_start+0x29)[0x7772d9]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.