Um dia tive problema para iniciar o mysqld no centos6.9 obtendo o erro abaixo.
Resolvi renomeando para old os arquivos ibdat_1 e ib_logfile0 que se encontram na pasta /var/lib/mysql e tentando iniciar novamente o serviço.
180921 8:26:13 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 180921 8:26:13InnoDB: Error: trying to access a stray pointer 0x80007fd24fc0bff8 InnoDB: buf pool start is at 0x7fd24fbfc000, end at 0x7fd28fffc000 InnoDB: Probable reason is database corruption or memory InnoDB: corruption. If this happens in an InnoDB database recovery, see InnoDB: http://dev.mysql.com/doc/refman/5.1/en/forcing-innodb-recovery.html InnoDB: how to force recovery. 180921 8:26:13 InnoDB: Assertion failure in thread 140542509713376 in file ../../storage/innobase/include/buf0buf.ic line 264 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-innodb-recovery.html InnoDB: about forcing recovery. 11:26:13 UTC - 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=8384512 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 = 338336 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 0x40000 /usr/libexec/mysqld(my_print_stacktrace+0x29) [0x850ca9] /usr/libexec/mysqld(handle_fatal_signal+0x483) [0x6a4143] /lib64/libpthread.so.0(+0xf7e0) [0x7fd29a1c57e0] /lib64/libc.so.6(gsignal+0x35) [0x7fd2987f9495] /lib64/libc.so.6(abort+0x175) [0x7fd2987fac75] /usr/libexec/mysqld(page_cur_search_with_match+0x77b) [0x79855b] /usr/libexec/mysqld(btr_cur_search_to_nth_level+0x6ea) [0x73bd9a] /usr/libexec/mysqld(btr_pcur_open_on_user_rec+0x64) [0x7eab34] /usr/libexec/mysqld() [0x75a46f] /usr/libexec/mysqld(dict_load_sys_table+0x59) [0x7602d9] /usr/libexec/mysqld(dict_boot+0x91c) [0x7ebf6c] /usr/libexec/mysqld(innobase_start_or_create_for_mysql+0x11f6) [0x7c8466] /usr/libexec/mysqld() [0x72f84b] /usr/libexec/mysqld(ha_initialize_handlerton(st_plugin_int*)+0x31) [0x697b91] /usr/libexec/mysqld() [0x7177db] /usr/libexec/mysqld(plugin_init(int*, char**, int)+0x6e4) [0x719ad4] /usr/libexec/mysqld() [0x5bf242] /usr/libexec/mysqld(main+0x1b3) [0x5c1bb3] /lib64/libc.so.6(__libc_start_main+0xfd) [0x7fd2987e5d1d] /usr/libexec/mysqld() [0x509939] 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. 180921 08:26:13 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended