Hi after chnage to MariaDB i faced tonight that the third time on one of our dbmail-replication-slaves while that never happened with MySQL over years :-( 140221 3:19:50 InnoDB: Assertion failure in thread 139652707100416 in file buf0buf.c line 4172 InnoDB: We intentionally generate a memory trap. InnoDB: Submit a detailed bug report to http://bugs.mysql.com. InnoDB: If you get repeated assertion failures or crashes, even InnoDB: immediately after the mysqld startup, there may be InnoDB: corruption in the InnoDB tablespace. Please refer to InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html InnoDB: about forcing recovery. 140221 3:19:50 [ERROR] mysqld got signal 6 ; 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. To report this bug, see http://kb.askmonty.org/en/reporting-bugs We will try our best to scrape up some info that will hopefully help diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail. Server version: 5.5.35-MariaDB key_buffer_size=10485760 read_buffer_size=131072 max_used_connections=1 max_threads=502 thread_count=0 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 211932 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x0x0 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 = 0x0 thread_stack 0x48000 /usr/libexec/mysqld(my_print_stacktrace+0x2e)[0x7f037fbde42e] /usr/libexec/mysqld(handle_fatal_signal+0x505)[0x7f037f847a25] /lib64/libpthread.so.0(+0xef90)[0x7f037d686f90] /lib64/libc.so.6(gsignal+0x39)[0x7f037d2ec9e9] /lib64/libc.so.6(abort+0x148)[0x7f037d2ee0f8] /usr/libexec/mysqld(+0x63f008)[0x7f037fa03008] /usr/libexec/mysqld(+0x676218)[0x7f037fa3a218] /usr/libexec/mysqld(+0x5f8048)[0x7f037f9bc048] /lib64/libpthread.so.0(+0x7c53)[0x7f037d67fc53] /lib64/libc.so.6(clone+0x6d)[0x7f037d3acdbd] 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. 140221 3:19:52 InnoDB: The InnoDB memory heap is disabled 140221 3:19:52 InnoDB: Mutexes and rw_locks use GCC atomic builtins 140221 3:19:52 InnoDB: Compressed tables use zlib 1.2.7 140221 3:19:52 InnoDB: Using Linux native AIO 140221 3:19:52 InnoDB: Initializing buffer pool, size = 64.0M 140221 3:19:52 InnoDB: Completed initialization of buffer pool 140221 3:19:52 InnoDB: highest supported file format is Barracuda. InnoDB: Log scan progressed past the checkpoint lsn 153930874326 140221 3:19:52 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... InnoDB: Doing recovery: scanned up to log sequence number 153931613156 140221 3:19:53 InnoDB: Starting an apply batch of log records to the database... InnoDB: Progress in percents: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 InnoDB: Apply batch completed InnoDB: In a MySQL replication slave the last master binlog file InnoDB: position 75471956, file name bin.000375 InnoDB: and relay log file InnoDB: position 75472234, file name ./mysql-relay-bin.001426 InnoDB: Last MySQL binlog file position 0 1179902, file name /data/mysql/mysql_dbmail/bin.000224 140221 3:19:53 InnoDB: Waiting for the background threads to start 140221 3:19:54 Percona XtraDB (http://www.percona.com) 5.5.35-MariaDB-33.0 started; log sequence number 153931613156 140221 3:19:54 [Note] Plugin 'FEDERATED' is disabled. 140221 3:19:54 [Note] Plugin 'FEEDBACK' is disabled. 140221 3:19:54 [Note] Server socket created on IP: '0.0.0.0'. 140221 3:19:55 [Note] Slave SQL thread initialized, starting replication in log 'bin.000375' at position 75471956, relay log './mysql-relay-bin.001426' position: 75472234 140221 3:19:55 [Note] Slave I/O thread: connected to master 'replication@******:3307',replication started in log 'bin.000376' at position 245 140221 3:19:55 [Note] Event Scheduler: Loaded 0 events 140221 3:19:55 [Note] /usr/libexec/mysqld: ready for connections. Version: '5.5.35-MariaDB' socket: '/var/lib/mysql/mysqld_dbmail.sock' port: 3307