Full log: [root@mysql-57 bin]# ./xtrabackup --prepare --target-dir=/home/backup_dir/full/ --defaults-file=backup-my.cnf xtrabackup: Error: --defaults-file must be specified first on the command line [root@mysql-57 bin]# ./xtrabackup --defaults-file=backup-my.cnf --prepare --target-dir=/home/backup_dir/full/ xtrabackup: [ERROR] Could not open required defaults file: /usr/local/xtrabackup/bin/backup-my.cnf xtrabackup: [ERROR] Fatal error in defaults handling. Program aborted! ./xtrabackup version 2.3.1beta1 based on MySQL server 5.7.10 Linux (x86_64) (revision id: ) xtrabackup: cd to /home/backup_dir/full xtrabackup: This target seems to be not prepared yet. InnoDB: Number of pools: 1 xtrabackup: xtrabackup_logfile detected: size=2097152, start_lsn=(2491701) xtrabackup: using the following InnoDB configuration for recovery: xtrabackup: innodb_data_home_dir = . xtrabackup: innodb_data_file_path = ibdata1:10M:autoextend xtrabackup: innodb_log_group_home_dir = . xtrabackup: innodb_log_files_in_group = 1 xtrabackup: innodb_log_file_size = 2097152 xtrabackup: using the following InnoDB configuration for recovery: xtrabackup: innodb_data_home_dir = . xtrabackup: innodb_data_file_path = ibdata1:10M:autoextend xtrabackup: innodb_log_group_home_dir = . xtrabackup: innodb_log_files_in_group = 1 xtrabackup: innodb_log_file_size = 2097152 xtrabackup: Starting InnoDB instance for recovery. xtrabackup: Using 104857600 bytes for buffer pool (set by --use-memory parameter) InnoDB: PUNCH HOLE support available InnoDB: Mutexes and rw_locks use GCC atomic builtins InnoDB: Uses event mutexes InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier InnoDB: Compressed tables use zlib 1.2.7 InnoDB: Number of pools: 1 InnoDB: Using CPU crc32 instructions InnoDB: Initializing buffer pool, total size = 100M, instances = 1, chunk size = 100M InnoDB: Completed initialization of buffer pool InnoDB: page_cleaner coordinator priority: -20 InnoDB: Highest supported file format is Barracuda. InnoDB: Log scan progressed past the checkpoint lsn 2491701 InnoDB: Doing recovery: scanned up to log sequence number 2491710 (0%) InnoDB: Doing recovery: scanned up to log sequence number 2491710 (0%) InnoDB: Database was not shutdown normally! InnoDB: Starting crash recovery. InnoDB: Creating shared tablespace for temporary tables InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ... InnoDB: File './ibtmp1' size is now 12 MB. InnoDB: 96 redo rollback segment(s) found. 1 redo rollback segment(s) are active. InnoDB: 32 non-redo rollback segment(s) are active. InnoDB: 5.7.10 started; log sequence number 2491710 InnoDB: Loading buffer pool(s) from /home/backup_dir/full/(null) InnoDB: not started InnoDB: Cannot open '/home/backup_dir/full/(null)' for reading: No such file or directory [notice (again)] If you use binary log and don't use any hack of group commit, the binary log position seems to be: xtrabackup: starting shutdown with innodb_fast_shutdown = 1 InnoDB: FTS optimize thread exiting. InnoDB: Starting shutdown... InnoDB: Dumping buffer pool(s) to /home/backup_dir/full/(null) InnoDB: Buffer pool(s) dump completed at 160107 6:08:17 InnoDB: Shutdown completed; log sequence number 2491729 InnoDB: Number of pools: 1 xtrabackup: using the following InnoDB configuration for recovery: xtrabackup: innodb_data_home_dir = . xtrabackup: innodb_data_file_path = ibdata1:10M:autoextend xtrabackup: innodb_log_group_home_dir = . xtrabackup: innodb_log_files_in_group = 2 xtrabackup: innodb_log_file_size = 50331648 InnoDB: PUNCH HOLE support available InnoDB: Mutexes and rw_locks use GCC atomic builtins InnoDB: Uses event mutexes InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier InnoDB: Compressed tables use zlib 1.2.7 InnoDB: Number of pools: 1 InnoDB: Using CPU crc32 instructions InnoDB: Initializing buffer pool, total size = 100M, instances = 1, chunk size = 100M InnoDB: Completed initialization of buffer pool InnoDB: page_cleaner coordinator priority: -20 InnoDB: Setting log file ./ib_logfile101 size to 48 MB InnoDB: Setting log file ./ib_logfile1 size to 48 MB InnoDB: Renaming log file ./ib_logfile101 to ./ib_logfile0 InnoDB: New log files created, LSN=2491729 InnoDB: Highest supported file format is Barracuda. InnoDB: Log scan progressed past the checkpoint lsn 2491916 InnoDB: Doing recovery: scanned up to log sequence number 2491925 (0%) InnoDB: Doing recovery: scanned up to log sequence number 2491925 (0%) InnoDB: Database was not shutdown normally! InnoDB: Starting crash recovery. InnoDB: Removed temporary tablespace data file: "ibtmp1" InnoDB: Creating shared tablespace for temporary tables InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ... InnoDB: File './ibtmp1' size is now 12 MB. InnoDB: 96 redo rollback segment(s) found. 1 redo rollback segment(s) are active. InnoDB: 32 non-redo rollback segment(s) are active. InnoDB: 5.7.10 started; log sequence number 2491925 InnoDB: Loading buffer pool(s) from /home/backup_dir/full/(null) xtrabackup: starting shutdown with innodb_fast_shutdown = 1 InnoDB: not started InnoDB: Buffer pool(s) load completed at 160107 6:08:19 InnoDB: Buffer pool(s) load completed at 160107 6:08:19 InnoDB: Starting shutdown... InnoDB: Dumping buffer pool(s) to /home/backup_dir/full/(null) InnoDB: Buffer pool(s) dump completed at 160107 6:08:19 InnoDB: Shutdown completed; log sequence number 2491944 completed OK! 11:08:21 UTC - xtrabackup got signal 11 ; This could be because you hit a bug or data is corrupted. 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. 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 0x10000 ./xtrabackup(my_print_stacktrace+0x2c)[0xf8955c] ./xtrabackup(handle_fatal_signal+0x262)[0x9fabe2] /lib64/libpthread.so.0(+0xf100)[0x7fb0fee4a100] ./xtrabackup(free_root+0x36)[0xf85856] ./xtrabackup(free_defaults+0x6b)[0x73b20b] ./xtrabackup(main+0x954)[0x6f0374] /lib64/libc.so.6(__libc_start_main+0xf5)[0x7fb0fd39ab15] ./xtrabackup[0x709ae5] Please report a bug at https://bugs.launchpad.net/percona-xtrabackup