Just saw this in Percona Server 5.1.42, just after corruption was detected. Perhaps it will help for those cases where corruption is not involved (or perhaps others need to check for corruption): InnoDB: Page directory corruption: infimum not pointed to 131217 7:35:32 InnoDB: Page dump in ascii and hex (16384 bytes): len 16384; hex 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asc ; InnoDB: End of page dump 131217 7:35:32 InnoDB: Page checksum 1575996416, prior-to-4.0.14-form checksum 1371122432 InnoDB: stored checksum 0, prior-to-4.0.14-form stored checksum 0 InnoDB: Page lsn 0 0, low 4 bytes of lsn at page end 0 InnoDB: Page number (if stored to page already) 0, InnoDB: space id (if created with >= MySQL-4.1.1 and stored already) 0 InnoDB: Page may be a freshly allocated page InnoDB: Page directory corruption: supremum not pointed to 131217 7:35:32 InnoDB: Page dump in ascii and hex (16384 bytes): len 16384; hex 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asc ; InnoDB: End of page dump 131217 7:35:32 InnoDB: Page checksum 1575996416, prior-to-4.0.14-form checksum 1371122432 InnoDB: stored checksum 0, prior-to-4.0.14-form stored checksum 0 InnoDB: Page lsn 0 0, low 4 bytes of lsn at page end 0 InnoDB: Page number (if stored to page already) 0, InnoDB: space id (if created with >= MySQL-4.1.1 and stored already) 0 InnoDB: Page may be a freshly allocated page 131217 7:35:32 InnoDB: Assertion failure in thread 1235589440 in file rem/rem0rec.c line 538 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/5.1/en/forcing-recovery.html InnoDB: about forcing recovery. 131217 7:35:32 - 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. 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. key_buffer_size=4194304 read_buffer_size=131072 max_used_connections=54 max_threads=2500 threads_connected=18 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 5469486 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. thd: 0x187e26c0 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 = 0x49a590f0 thread_stack 0x40000 /usr/local/fortiva/mysql/libexec/mysqld(my_print_stacktrace+0x35)[0x8731c5] /usr/local/fortiva/mysql/libexec/mysqld(handle_segfault+0x322)[0x5a2bd2] /lib64/libpthread.so.0[0x3690a0eb10] /lib64/libc.so.6(gsignal+0x35)[0x3690230265] /lib64/libc.so.6(abort+0x110)[0x3690231d10] /usr/local/fortiva/mysql/libexec/mysqld[0x77fe4f] /usr/local/fortiva/mysql/libexec/mysqld[0x76b2af] /usr/local/fortiva/mysql/libexec/mysqld[0x7d102f] /usr/local/fortiva/mysql/libexec/mysqld[0x7d1572] /usr/local/fortiva/mysql/libexec/mysqld[0x73ce9f] /usr/local/fortiva/mysql/libexec/mysqld[0x681e93] /usr/local/fortiva/mysql/libexec/mysqld[0x6827a0] /usr/local/fortiva/mysql/libexec/mysqld[0x682a49] /usr/local/fortiva/mysql/libexec/mysqld(_ZN10SQL_SELECT17test_quick_selectEP3THD6BitmapILj64EEyyb+0xdc4)[0x68bb94] /usr/local/fortiva/mysql/libexec/mysqld[0x61cf1c] /usr/local/fortiva/mysql/libexec/mysqld(_ZN4JOIN8optimizeEv+0x59c)[0x61d92c] /usr/local/fortiva/mysql/libexec/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0xab)[0x6272bb] /usr/local/fortiva/mysql/libexec/mysqld(_Z13handle_selectP3THDP6st_lexP13select_resultm+0x169)[0x627ce9] /usr/local/fortiva/mysql/libexec/mysqld[0x5ad11c] /usr/local/fortiva/mysql/libexec/mysqld(_Z21mysql_execute_commandP3THD+0x1841)[0x5b21d1] /usr/local/fortiva/mysql/libexec/mysqld(_Z11mysql_parseP3THDPKcjPS2_+0x231)[0x5b87d1] /usr/local/fortiva/mysql/libexec/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x3f3)[0x5b8bd3] /usr/local/fortiva/mysql/libexec/mysqld(_Z10do_commandP3THD+0xe4)[0x5b9dd4] /usr/local/fortiva/mysql/libexec/mysqld(handle_one_connection+0x5b7)[0x5aa677] /lib64/libpthread.so.0[0x3690a0673d] /lib64/libc.so.6(clone+0x6d)[0x36902d44bd] Trying to get some variables. Some pointers may be invalid and cause the dump to abort... thd->query at 0x2aacc4032bc0 is an invalid pointer thd->thread_id=237378 thd->killed=NOT_KILLED 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. mysqld: my_new.cc:51: int __cxa_pure_virtual(): Assertion `! "Aborted: pure virtual method called."' failed. mysqld: my_new.cc:51: int __cxa_pure_virtual(): Assertion `! "Aborted: pure virtual method called."' failed. mysqld: my_new.cc:51: int __cxa_pure_virtual(): Assertion `! "Aborted: pure virtual method called."' failed. 131217 07:35:33 mysqld_safe Number of processes running now: 0 131217 07:35:33 mysqld_safe mysqld restarted