(gdb) +thread apply all bt

Thread 35 (LWP 9382):
+bt
#0  0x0000003fde20ec0d in fsync () from /lib64/libpthread.so.0
#1  0x000000000098376d in os_file_fsync (file=11) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:2282
#2  0x0000000000983819 in os_file_flush_func (file=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:2383
#3  0x0000000000973d84 in pfs_os_file_flush_func (src_file=0xbe5750 "/bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/log/log0online.cc", file=11, src_line=1117) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/include/os0file.ic:355
#4  log_online_write_bitmap_page (block=0x7f849c007800 "") at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/log/log0online.cc:1117
#5  log_online_write_bitmap () at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/log/log0online.cc:1183
#6  log_online_follow_redo_log () at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/log/log0online.cc:1245
#7  0x00000000009e957d in srv_redo_log_follow_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0srv.cc:2213
#8  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#9  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 34 (LWP 9389):
+bt
#0  0x0000003fde20b43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000009887c3 in os_cond_wait (fast_mutex=0x2c726f0, cond=0x2c72730) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:214
#2  os_event_wait_low (event=0x2c726f0, reset_sig_count=126) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:610
#3  0x00000000009f54a4 in sync_array_wait_event (arr=0x2c25540, index=2) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/sync/sync0arr.cc:424
#4  0x00000000009f6908 in mutex_spin_wait (mutex=0x2c72618, file_name=0xc06d80 "/bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc", line=5595) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/sync/sync0sync.cc:583
#5  0x0000000000a82676 in mutex_enter_func (line=5595, mutex=0x2c72618, file_name=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/include/sync0sync.ic:220
#6  pfs_mutex_enter_func (mutex=0x2c72618, line=5595, file_name=0xc06d80 "/bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc") at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/include/sync0sync.ic:251
#7  0x0000000000a83efa in fil_flush (space_id=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:5595
#8  0x0000000000a84e96 in fil_flush_file_spaces (purpose=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:5698
#9  0x0000000000a4b9ad in buf_dblwr_flush_buffered_writes () at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/buf/buf0dblwr.cc:750
#10 0x0000000000a51db8 in buf_flush_common (page_count=64, flush_type=BUF_FLUSH_LIST) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/buf/buf0flu.cc:1722
#11 buf_flush_list (min_n=200, lsn_limit=18446744073709551615, n_processed=0x7f84883f5d90) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/buf/buf0flu.cc:1934
#12 0x0000000000a5265a in page_cleaner_do_flush_batch (lsn_limit=18446744073709551615, n_to_flush=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/buf/buf0flu.cc:2136
#13 buf_flush_page_cleaner_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/buf/buf0flu.cc:2398
#14 0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#15 0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 33 (LWP 9722):
+bt
#0  0x0000003fde20b43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000009887c3 in os_cond_wait (fast_mutex=0x300f8e0, cond=0x300f920) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:214
#2  os_event_wait_low (event=0x300f8e0, reset_sig_count=1922) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:610
#3  0x00000000009f54a4 in sync_array_wait_event (arr=0x2c25540, index=0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/sync/sync0arr.cc:424
#4  0x00000000009f5eae in rw_lock_x_lock_func (lock=0x1318460 <dict_operation_lock>, pass=0, file_name=0xc050e8 "/bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/dict/dict0stats.cc", line=2237) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/sync/sync0rw.cc:710
#5  0x0000000000a7c528 in pfs_rw_lock_x_lock_func (line=2237, lock=<optimized out>, pass=<optimized out>, file_name=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/include/sync0rw.ic:594
#6  dict_stats_save (table_orig=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/dict/dict0stats.cc:2237
#7  0x0000000000a7f53c in dict_stats_update (table=0x7f83dc037b68, stats_upd_option=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/dict/dict0stats.cc:2993
#8  0x0000000000936d9c in ha_innobase::create (this=<optimized out>, name=0x0, form=<optimized out>, create_info=0x0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/handler/ha_innodb.cc:10087
#9  0x00000000005ae2fd in ha_create_table (thd=0x3182f30, path=<optimized out>, db=0x7f83dc004e90 "query19701", table_name=0x7f83dc004ea0 "t4", create_info=0x7f8485a6a3e0, update_create_info=false, is_temp_table=false) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/handler.cc:4830
#10 0x000000000077b612 in rea_create_table (thd=0x3182f30, path=0x7f8485a68ea0 "./query19701/t4", db=0x7f83dc004e90 "query19701", table_name=0x7f83dc004ea0 "t4", create_info=0x7f8485a6a3e0, create_fields=..., keys=40, key_info=0x7f83dc07e8d0, file=0x7f83dc07c8e0, no_ha_table=false) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/unireg.cc:526
#11 0x000000000072b817 in create_table_impl (thd=0x3182f30, db=0x7f83dc004e90 "query19701", table_name=0x7f83dc004ea0 "t4", path=0x7f8485a68ea0 "./query19701/t4", create_info=0x7f8485a6a3e0, alter_info=0x7f8485a6a4c0, internal_tmp_table=false, select_field_count=0, no_ha_table=false, is_trans=0x7f8485a6a5df, key_info=0x7f8485a690b0, key_count=0x7f8485a690b8) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_table.cc:4841
#12 0x000000000072be97 in mysql_create_table_no_lock (thd=0x3182f30, db=0x7f83dc004e90 "query19701", table_name=0x7f83dc004ea0 "t4", create_info=0x7f8485a6a3e0, alter_info=0x7f8485a6a4c0, select_field_count=0, is_trans=0x7f8485a6a5df) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_table.cc:4953
#13 0x000000000072c219 in mysql_create_like_table (thd=0x3182f30, table=0x7f83dc004ed8, src_table=0x7f83dc0054e0, create_info=0x7f8485a6ac80) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_table.cc:5275
#14 0x00000000006e04e8 in mysql_execute_command (thd=0x3182f30) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:3246
#15 0x00000000006e1568 in mysql_parse (thd=0x3182f30, rawbuf=<optimized out>, length=51925688, parser_state=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:6451
#16 0x00000000006e2421 in dispatch_command (command=COM_QUERY, thd=0x3182f30, packet=0x30e7d61 "CREATE TABLE query19701 . t4 LIKE test . `table500_innodb_default`", packet_length=66) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:1376
#17 0x00000000006b006f in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1615
#18 0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#19 0x00000000009196a9 in pfs_spawn_thread (arg=0x3120e70) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#20 0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#21 0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 32 (LWP 9379):
+bt
#0  0x0000003fdda00614 in ?? () from /lib64/libaio.so.1
#1  0x0000000000984d6b in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x2c645c0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5086
#2  os_aio_linux_handle (global_seg=7, message1=0x7f848e6abd98, message2=0x7f848e6abd90, type=0x7f848e6abd88, space_id=0x7f848e6abd80) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5231
#3  0x0000000000a83ce8 in fil_aio_wait (segment=7) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:5469
#4  0x00000000009ef9c8 in io_handler_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0start.cc:479
#5  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#6  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 31 (LWP 9381):
+bt
#0  0x0000003fdda00614 in ?? () from /lib64/libaio.so.1
#1  0x0000000000984d6b in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x2c645c0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5086
#2  os_aio_linux_handle (global_seg=9, message1=0x7f848d2a9d98, message2=0x7f848d2a9d90, type=0x7f848d2a9d88, space_id=0x7f848d2a9d80) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5231
#3  0x0000000000a83ce8 in fil_aio_wait (segment=9) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:5469
#4  0x00000000009ef9c8 in io_handler_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0start.cc:479
#5  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#6  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 30 (LWP 9671):
+bt
#0  0x0000003fde20b43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x000000000059a5ef in inline_mysql_cond_wait (src_line=2652, mutex=0x12b8be0 <LOCK_thread_count>, that=0x12bab40 <COND_thread_cache>, src_file=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/include/mysql/psi/mysql_thread.h:1162
#2  block_until_new_connection () at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:2652
#3  one_thread_per_connection_end (thd=<optimized out>, block_pthread=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:2746
#4  0x00000000006affee in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1629
#5  0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#6  0x00000000009196a9 in pfs_spawn_thread (arg=0x30d9220) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#7  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#8  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 29 (LWP 9662):
+bt
#0  0x0000003fde20b43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x000000000059a5ef in inline_mysql_cond_wait (src_line=2652, mutex=0x12b8be0 <LOCK_thread_count>, that=0x12bab40 <COND_thread_cache>, src_file=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/include/mysql/psi/mysql_thread.h:1162
#2  block_until_new_connection () at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:2652
#3  one_thread_per_connection_end (thd=<optimized out>, block_pthread=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:2746
#4  0x00000000006affee in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1629
#5  0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#6  0x00000000009196a9 in pfs_spawn_thread (arg=0x30748e0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#7  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#8  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 28 (LWP 9387):
+bt
#0  0x0000003fddee14f3 in select () from /lib64/libc.so.6
#1  0x00000000009894bf in os_thread_sleep (tm=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0thread.cc:255
#2  0x00000000009ef013 in srv_master_sleep () at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0srv.cc:2803
#3  srv_master_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0srv.cc:2847
#4  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#5  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 27 (LWP 9641):
+bt
#0  0x0000003fde20b43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x000000000059a5ef in inline_mysql_cond_wait (src_line=2652, mutex=0x12b8be0 <LOCK_thread_count>, that=0x12bab40 <COND_thread_cache>, src_file=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/include/mysql/psi/mysql_thread.h:1162
#2  block_until_new_connection () at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:2652
#3  one_thread_per_connection_end (thd=<optimized out>, block_pthread=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:2746
#4  0x00000000006affee in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1629
#5  0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#6  0x00000000009196a9 in pfs_spawn_thread (arg=0x31a6440) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#7  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#8  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 26 (LWP 9385):
+bt
#0  0x0000003fde20b7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000000988f2b in os_cond_wait_timed (abstime=0x7f848a1f8cc0, fast_mutex=0x2c261e0, cond=0x2c26220) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:177
#2  os_event_wait_time_low (event=0x2c261e0, time_in_usec=<optimized out>, reset_sig_count=1) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:723
#3  0x00000000009eaa76 in srv_error_monitor_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0srv.cc:2084
#4  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#5  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 25 (LWP 9388):
+bt
#0  0x0000003fde20b43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000009887c3 in os_cond_wait (fast_mutex=0x2c26150, cond=0x2c26190) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:214
#2  os_event_wait_low (event=0x2c26150, reset_sig_count=16109) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:610
#3  0x00000000009ede98 in srv_purge_coordinator_suspend (rseg_history_len=1309, slot=0x2c25f60) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0srv.cc:3140
#4  srv_purge_coordinator_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0srv.cc:3257
#5  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#6  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 24 (LWP 9394):
+bt
#0  0x0000003fddedf253 in poll () from /lib64/libc.so.6
#1  0x0000000000b44c3f in vio_io_wait (vio=<optimized out>, event=<optimized out>, timeout=28800000) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/vio/viosocket.c:820
#2  0x0000000000b44d33 in vio_socket_io_wait (vio=<optimized out>, event=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/vio/viosocket.c:68
#3  0x0000000000b45368 in vio_read (vio=0x31b1fc0, buf=0x31b21b0 "\a", size=4) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/vio/viosocket.c:123
#4  0x00000000006584b3 in net_read_raw_loop (net=0x30d59b0, count=4) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:663
#5  0x0000000000658d4b in net_read_packet_header (net=0x30d59b0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:745
#6  net_read_packet (net=<optimized out>, complen=0x7f848c867cb8) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:810
#7  0x0000000000658fbc in my_net_read (net=0x30d59b0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:888
#8  0x00000000006e31ed in do_command (thd=0x30d5740) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:985
#9  0x00000000006b006f in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1615
#10 0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#11 0x00000000009196a9 in pfs_spawn_thread (arg=0x31a6440) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#12 0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#13 0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 23 (LWP 9378):
+bt
#0  0x0000003fdda00614 in ?? () from /lib64/libaio.so.1
#1  0x0000000000984d6b in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x2c645c0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5086
#2  os_aio_linux_handle (global_seg=6, message1=0x7f848f0acd98, message2=0x7f848f0acd90, type=0x7f848f0acd88, space_id=0x7f848f0acd80) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5231
#3  0x0000000000a83ce8 in fil_aio_wait (segment=6) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:5469
#4  0x00000000009ef9c8 in io_handler_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0start.cc:479
#5  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#6  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 22 (LWP 9659):
+bt
#0  0x0000003fde20b43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x000000000059a5ef in inline_mysql_cond_wait (src_line=2652, mutex=0x12b8be0 <LOCK_thread_count>, that=0x12bab40 <COND_thread_cache>, src_file=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/include/mysql/psi/mysql_thread.h:1162
#2  block_until_new_connection () at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:2652
#3  one_thread_per_connection_end (thd=<optimized out>, block_pthread=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:2746
#4  0x00000000006affee in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1629
#5  0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#6  0x00000000009196a9 in pfs_spawn_thread (arg=0x30748e0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#7  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#8  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 21 (LWP 9393):
+bt
#0  0x0000003fde20f2a5 in sigwait () from /lib64/libpthread.so.0
#1  0x000000000059959b in signal_hand (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:3158
#2  0x00000000009196a9 in pfs_spawn_thread (arg=0x306d360) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#3  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#4  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 20 (LWP 9384):
+bt
#0  0x0000003fde20b7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000000988f2b in os_cond_wait_timed (abstime=0x7f848abf9d00, fast_mutex=0x2fe93a0, cond=0x2fe93e0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:177
#2  os_event_wait_time_low (event=0x2fe93a0, time_in_usec=<optimized out>, reset_sig_count=19) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:723
#3  0x0000000000969f31 in lock_wait_timeout_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/lock/lock0wait.cc:502
#4  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#5  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 19 (LWP 9392):
+bt
#0  0x0000003fde20b7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000000988f2b in os_cond_wait_timed (abstime=0x7f84865f2c90, fast_mutex=0x304b890, cond=0x304b8d0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:177
#2  os_event_wait_time_low (event=0x304b890, time_in_usec=<optimized out>, reset_sig_count=1) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:723
#3  0x0000000000a19802 in ib_wqueue_timedwait (wq=0x304b708, wait_in_usecs=5000000) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/ut/ut0wqueue.cc:154
#4  0x0000000000aad3d3 in fts_optimize_thread (arg=0x304b708) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fts/fts0opt.cc:2932
#5  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#6  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 18 (LWP 9697):
+bt
#0  0x0000003fde20b43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000009887c3 in os_cond_wait (fast_mutex=0x300f6d0, cond=0x300f710) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:214
#2  os_event_wait_low (event=0x300f6d0, reset_sig_count=2035) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:610
#3  0x00000000009f54a4 in sync_array_wait_event (arr=0x2c25540, index=1) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/sync/sync0arr.cc:424
#4  0x00000000009f6908 in mutex_spin_wait (mutex=0x300f618, file_name=0xc050e8 "/bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/dict/dict0stats.cc", line=728) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/sync/sync0sync.cc:583
#5  0x0000000000a7c509 in pfs_mutex_enter_func (line=728, mutex=0x300f618, file_name=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/include/sync0sync.ic:251
#6  dict_stats_snapshot_create (table=0x7f83f4031cd8) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/dict/dict0stats.cc:728
#7  dict_stats_save (table_orig=0x7f83f4031cd8) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/dict/dict0stats.cc:2232
#8  0x0000000000a7fad6 in dict_stats_update (table=0x7f83f4031cd8, stats_upd_option=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/dict/dict0stats.cc:2960
#9  0x0000000000946865 in alter_stats_rebuild (thd=0x310f030, table_name=0x7f83f402c1bb "t3", table=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/handler/handler0alter.cc:5185
#10 ha_innobase::commit_inplace_alter_table (this=<optimized out>, altered_table=0x7f83f402cd90, ha_alter_info=0x7f8485befdb0, commit=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/handler/handler0alter.cc:5760
#11 0x000000000072ec75 in mysql_inplace_alter_table (thd=0x310f030, table_list=0x7f83f40268a8, table=0x7f83f4028790, altered_table=0x7f83f402cd90, ha_alter_info=0x7f8485befdb0, inplace_supported=HA_ALTER_INPLACE_NO_LOCK_AFTER_PREPARE, target_mdl_request=0x7f8485befb20, alter_ctx=0x7f8485bee500) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_table.cc:6527
#12 0x0000000000730fe7 in mysql_alter_table (thd=<optimized out>, new_db=0x7f8485bf0520 "", new_name=<optimized out>, create_info=<optimized out>, table_list=0x7f83f40268a8, alter_info=<optimized out>, order_num=0, order=0x0, ignore=false) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_table.cc:8369
#13 0x0000000000818957 in Sql_cmd_alter_table::execute (this=<optimized out>, thd=0x310f030) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_alter.cc:317
#14 0x00000000006de1b0 in mysql_execute_command (thd=0x310f030) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:5132
#15 0x00000000006e1568 in mysql_parse (thd=0x310f030, rawbuf=<optimized out>, length=51450808, parser_state=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:6451
#16 0x00000000006e2421 in dispatch_command (command=COM_QUERY, thd=0x310f030, packet=0x3130741 "ALTER TABLE query19683 . `t3` DROP COLUMN `c59`", packet_length=47) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:1376
#17 0x00000000006b006f in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1615
#18 0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#19 0x00000000009196a9 in pfs_spawn_thread (arg=0x311b010) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#20 0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#21 0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 17 (LWP 9391):
+bt
#0  0x0000003fde20b7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000000988f2b in os_cond_wait_timed (abstime=0x7f8486ff3d00, fast_mutex=0x300bd90, cond=0x300bdd0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:177
#2  os_event_wait_time_low (event=0x300bd90, time_in_usec=<optimized out>, reset_sig_count=82) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:723
#3  0x0000000000a805e7 in dict_stats_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/dict/dict0stats_bg.cc:349
#4  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#5  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 16 (LWP 9373):
+bt
#0  0x0000003fdda00614 in ?? () from /lib64/libaio.so.1
#1  0x0000000000984d6b in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x2c49080) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5086
#2  os_aio_linux_handle (global_seg=1, message1=0x7f84922b1d98, message2=0x7f84922b1d90, type=0x7f84922b1d88, space_id=0x7f84922b1d80) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5231
#3  0x0000000000a83ce8 in fil_aio_wait (segment=1) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:5469
#4  0x00000000009ef9c8 in io_handler_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0start.cc:479
#5  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#6  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 15 (LWP 9375):
+bt
#0  0x0000003fdda00614 in ?? () from /lib64/libaio.so.1
#1  0x0000000000984d6b in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x2c1c330) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5086
#2  os_aio_linux_handle (global_seg=3, message1=0x7f8490eafd98, message2=0x7f8490eafd90, type=0x7f8490eafd88, space_id=0x7f8490eafd80) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5231
#3  0x0000000000a83ce8 in fil_aio_wait (segment=3) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:5469
#4  0x00000000009ef9c8 in io_handler_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0start.cc:479
#5  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#6  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 14 (LWP 9377):
+bt
#0  0x0000003fdda00614 in ?? () from /lib64/libaio.so.1
#1  0x0000000000984d6b in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x2c1c330) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5086
#2  os_aio_linux_handle (global_seg=5, message1=0x7f848faadd98, message2=0x7f848faadd90, type=0x7f848faadd88, space_id=0x7f848faadd80) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5231
#3  0x0000000000a83ce8 in fil_aio_wait (segment=5) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:5469
#4  0x00000000009ef9c8 in io_handler_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0start.cc:479
#5  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#6  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 13 (LWP 9370):
+bt
#0  0x0000003fddedf253 in poll () from /lib64/libc.so.6
#1  0x000000000059ab7a in handle_connections_sockets () at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:6311
#2  0x00000000005a2831 in mysqld_main (argc=59, argv=0x2aa1118) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:5726
#3  0x0000003fdde1ecdd in __libc_start_main () from /lib64/libc.so.6
#4  0x0000000000593a59 in _start ()

Thread 12 (LWP 9380):
+bt
#0  0x0000003fdda00614 in ?? () from /lib64/libaio.so.1
#1  0x0000000000984d6b in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x2c645c0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5086
#2  os_aio_linux_handle (global_seg=8, message1=0x7f848dcaad98, message2=0x7f848dcaad90, type=0x7f848dcaad88, space_id=0x7f848dcaad80) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5231
#3  0x0000000000a83ce8 in fil_aio_wait (segment=8) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:5469
#4  0x00000000009ef9c8 in io_handler_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0start.cc:479
#5  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#6  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 11 (LWP 9376):
+bt
#0  0x0000003fdda00614 in ?? () from /lib64/libaio.so.1
#1  0x0000000000984d6b in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x2c1c330) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5086
#2  os_aio_linux_handle (global_seg=4, message1=0x7f84904aed98, message2=0x7f84904aed90, type=0x7f84904aed88, space_id=0x7f84904aed80) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5231
#3  0x0000000000a83ce8 in fil_aio_wait (segment=4) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:5469
#4  0x00000000009ef9c8 in io_handler_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0start.cc:479
#5  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#6  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 10 (LWP 9374):
+bt
#0  0x0000003fdda00614 in ?? () from /lib64/libaio.so.1
#1  0x0000000000984d6b in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x2c1c330) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5086
#2  os_aio_linux_handle (global_seg=2, message1=0x7f84918b0d98, message2=0x7f84918b0d90, type=0x7f84918b0d88, space_id=0x7f84918b0d80) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5231
#3  0x0000000000a83ce8 in fil_aio_wait (segment=2) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:5469
#4  0x00000000009ef9c8 in io_handler_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0start.cc:479
#5  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#6  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 9 (LWP 9386):
+bt
#0  0x0000003fde20b7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000000988f2b in os_cond_wait_timed (abstime=0x7f84897f7cf0, fast_mutex=0x2c26270, cond=0x2c262b0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:177
#2  os_event_wait_time_low (event=0x2c26270, time_in_usec=<optimized out>, reset_sig_count=1) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:723
#3  0x00000000009ecd44 in srv_monitor_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0srv.cc:1822
#4  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#5  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 8 (LWP 9390):
+bt
#0  0x0000003fde20b43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000009887c3 in os_cond_wait (fast_mutex=0x2c26300, cond=0x2c26340) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:214
#2  os_event_wait_low (event=0x2c26300, reset_sig_count=1) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0sync.cc:610
#3  0x0000000000a4de4c in buf_dump_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/buf/buf0dump.cc:594
#4  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#5  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 7 (LWP 9372):
+bt
#0  0x0000003fdda00614 in ?? () from /lib64/libaio.so.1
#1  0x0000000000984d6b in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x2c56b20) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5086
#2  os_aio_linux_handle (global_seg=0, message1=0x7f84a29cdd98, message2=0x7f84a29cdd90, type=0x7f84a29cdd88, space_id=0x7f84a29cdd80) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/os/os0file.cc:5231
#3  0x0000000000a83ce8 in fil_aio_wait (segment=0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:5469
#4  0x00000000009ef9c8 in io_handler_thread (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/srv/srv0start.cc:479
#5  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#6  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 6 (LWP 9699):
+bt
#0  0x0000003fddedf253 in poll () from /lib64/libc.so.6
#1  0x0000000000b44c3f in vio_io_wait (vio=<optimized out>, event=<optimized out>, timeout=28800000) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/vio/viosocket.c:820
#2  0x0000000000b44d33 in vio_socket_io_wait (vio=<optimized out>, event=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/vio/viosocket.c:68
#3  0x0000000000b45368 in vio_read (vio=0x3091d20, buf=0x31fce60 "(", size=4) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/vio/viosocket.c:123
#4  0x00000000006584b3 in net_read_raw_loop (net=0x31f97a0, count=4) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:663
#5  0x0000000000658d4b in net_read_packet_header (net=0x31f97a0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:745
#6  net_read_packet (net=<optimized out>, complen=0x7f8485bb0cb8) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:810
#7  0x0000000000658fbc in my_net_read (net=0x31f97a0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:888
#8  0x00000000006e31ed in do_command (thd=0x31f9530) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:985
#9  0x00000000006b006f in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1615
#10 0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#11 0x00000000009196a9 in pfs_spawn_thread (arg=0x31919d0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#12 0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#13 0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 5 (LWP 9702):
+bt
#0  0x0000003fddedf253 in poll () from /lib64/libc.so.6
#1  0x0000000000b44c3f in vio_io_wait (vio=<optimized out>, event=<optimized out>, timeout=28800000) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/vio/viosocket.c:820
#2  0x0000000000b44d33 in vio_socket_io_wait (vio=<optimized out>, event=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/vio/viosocket.c:68
#3  0x0000000000b45368 in vio_read (vio=0x30a46e0, buf=0x32047a0 "(", size=4) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/vio/viosocket.c:123
#4  0x00000000006584b3 in net_read_raw_loop (net=0x32010e0, count=4) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:663
#5  0x0000000000658d4b in net_read_packet_header (net=0x32010e0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:745
#6  net_read_packet (net=<optimized out>, complen=0x7f8485b6fcb8) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:810
#7  0x0000000000658fbc in my_net_read (net=0x32010e0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:888
#8  0x00000000006e31ed in do_command (thd=0x3200e70) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:985
#9  0x00000000006b006f in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1615
#10 0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#11 0x00000000009196a9 in pfs_spawn_thread (arg=0x3120e70) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#12 0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#13 0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 4 (LWP 9684):
+bt
#0  0x0000003fddedf253 in poll () from /lib64/libc.so.6
#1  0x0000000000b44c3f in vio_io_wait (vio=<optimized out>, event=<optimized out>, timeout=28800000) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/vio/viosocket.c:820
#2  0x0000000000b44d33 in vio_socket_io_wait (vio=<optimized out>, event=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/vio/viosocket.c:68
#3  0x0000000000b45368 in vio_read (vio=0x312ca30, buf=0x30ef6a0 "(", size=4) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/vio/viosocket.c:123
#4  0x00000000006584b3 in net_read_raw_loop (net=0x30ebfe0, count=4) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:663
#5  0x0000000000658d4b in net_read_packet_header (net=0x30ebfe0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:745
#6  net_read_packet (net=<optimized out>, complen=0x7f848c59ccb8) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:810
#7  0x0000000000658fbc in my_net_read (net=0x30ebfe0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/net_serv.cc:888
#8  0x00000000006e31ed in do_command (thd=0x30ebd70) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:985
#9  0x00000000006b006f in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1615
#10 0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#11 0x00000000009196a9 in pfs_spawn_thread (arg=0x3085da0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#12 0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#13 0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 3 (LWP 9737):
+bt
#0  0x0000003fde20b43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x000000000059a5ef in inline_mysql_cond_wait (src_line=2652, mutex=0x12b8be0 <LOCK_thread_count>, that=0x12bab40 <COND_thread_cache>, src_file=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/include/mysql/psi/mysql_thread.h:1162
#2  block_until_new_connection () at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:2652
#3  one_thread_per_connection_end (thd=<optimized out>, block_pthread=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:2746
#4  0x00000000006affee in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1629
#5  0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#6  0x00000000009196a9 in pfs_spawn_thread (arg=0x3085da0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#7  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#8  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 2 (LWP 9689):
+bt
#0  0x0000003fde20b43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x000000000059a5ef in inline_mysql_cond_wait (src_line=2652, mutex=0x12b8be0 <LOCK_thread_count>, that=0x12bab40 <COND_thread_cache>, src_file=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/include/mysql/psi/mysql_thread.h:1162
#2  block_until_new_connection () at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:2652
#3  one_thread_per_connection_end (thd=<optimized out>, block_pthread=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/mysqld.cc:2746
#4  0x00000000006affee in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1629
#5  0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#6  0x00000000009196a9 in pfs_spawn_thread (arg=0x3127e30) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#7  0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#8  0x0000003fddee890d in clone () from /lib64/libc.so.6

Thread 1 (LWP 9674):
+bt
#0  0x0000003fde20c69c in pthread_kill () from /lib64/libpthread.so.0
#1  0x0000000000661f7e in handle_fatal_signal (sig=6) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/signal_handler.cc:251
#2  <signal handler called>
#3  0x0000003fdde328a5 in raise () from /lib64/libc.so.6
#4  0x0000003fdde34085 in abort () from /lib64/libc.so.6
#5  0x0000000000a8bb46 in fil_rename_tablespace (old_name_in=0x7f848c65baf0 "query19698/#sql-ib649", id=140206968837207, new_name=0x7f8418089d00 "query19698/t3", new_path_in=0x0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/fil/fil0fil.cc:3041
#6  0x0000000000a69cbc in dict_table_rename_in_cache (table=0x7f841805df48, new_name=0x7f8418089d00 "query19698/t3", rename_also_foreigns=0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/dict/dict0dict.cc:1510
#7  0x0000000000945bb7 in commit_cache_rebuild (ctx=0x7f8418005630) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/handler/handler0alter.cc:4892
#8  ha_innobase::commit_inplace_alter_table (this=<optimized out>, altered_table=0x7f841808b780, ha_alter_info=0x7f848c65ddb0, commit=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/innobase/handler/handler0alter.cc:5566
#9  0x000000000072ec75 in mysql_inplace_alter_table (thd=0x3114700, table_list=0x7f8418004bf8, table=0x7f841808e410, altered_table=0x7f841808b780, ha_alter_info=0x7f848c65ddb0, inplace_supported=HA_ALTER_INPLACE_NO_LOCK_AFTER_PREPARE, target_mdl_request=0x7f848c65db20, alter_ctx=0x7f848c65c500) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_table.cc:6527
#10 0x0000000000730fe7 in mysql_alter_table (thd=<optimized out>, new_db=0x7f848c65e520 "", new_name=<optimized out>, create_info=<optimized out>, table_list=0x7f8418004bf8, alter_info=<optimized out>, order_num=0, order=0x0, ignore=false) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_table.cc:8369
#11 0x0000000000818957 in Sql_cmd_alter_table::execute (this=<optimized out>, thd=0x3114700) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_alter.cc:317
#12 0x00000000006de1b0 in mysql_execute_command (thd=0x3114700) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:5132
#13 0x00000000006e1568 in mysql_parse (thd=0x3114700, rawbuf=<optimized out>, length=51473032, parser_state=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:6451
#14 0x00000000006e2421 in dispatch_command (command=COM_QUERY, thd=0x3114700, packet=0x3078e61 "ALTER TABLE query19698 . `t3` DROP COLUMN `c57`", packet_length=47) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_parse.cc:1376
#15 0x00000000006b006f in do_handle_one_connection (thd_arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1615
#16 0x00000000006b0147 in handle_one_connection (arg=<optimized out>) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/sql/sql_connect.cc:1526
#17 0x00000000009196a9 in pfs_spawn_thread (arg=0x3085da0) at /bzr/5.6_opt/Percona-Server-5.6.11-alpha60.3/storage/perfschema/pfs.cc:1853
#18 0x0000003fde207851 in start_thread () from /lib64/libpthread.so.0
#19 0x0000003fddee890d in clone () from /lib64/libc.so.6
(gdb) +set logging off