Редкая ошибка MySQL

После установки mysql-community-server вместо mariadb-server на CentOS 7.4, приключилась доселе невиданная ошибка:

ERROR 3009 (HY000): Column count of mysql.user is wrong. Expected 45, found 42. Created with MySQL 50556, now running 50721. Please use mysql_upgrade to fix this error.

вылезло сие, при попытке добавить нового пользователя.

Лечение простое, под рутом:

mysql_upgrade --force -uroot -p

Восстановление innoDB базы mysql

Все бывает в первый раз. Вот и вчера, привычно потушил mysql, привычно запустил… и она не запустилась.
В логах при этом нашел сперва много вот таких строк:

[Warning] /usr/sbin/mysqld: Forcing close of thread 77 user: ‘zabbix’

а потом вот это:

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  1. 06:14:20 UTC - mysqld got signal 11 ;
  2. This could be because you hit a bug. It is also possible that this binary
  3. or one of the libraries it was linked against is corrupt, improperly built,
  4. or misconfigured. This error can also be caused by malfunctioning hardware.
  5. We will try our best to scrape up some info that will hopefully help
  6. diagnose the problem, but since we have already crashed,
  7. something is definitely wrong and this may fail.
  8.  
  9. key_buffer_size=16777216
  10. read_buffer_size=131072
  11. max_used_connections=0
  12. max_threads=151
  13. thread_count=0
  14. connection_count=0
  15. It is possible that mysqld could use up to
  16. key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 346701 K bytes of memory
  17. Hope that's ok; if not, decrease some variables in the equation.
  18.  
  19. Thread pointer: 0x0
  20. Attempting backtrace. You can use the following information to find out
  21. where mysqld died. If you see no messages after this, something went
  22. terribly wrong...
  23. stack_bottom = 0 thread_stack 0x30000
  24. /usr/sbin/mysqld(my_print_stacktrace+0x20)[0x7fa28436d6b0]
  25. /usr/sbin/mysqld(handle_fatal_signal+0x3d5)[0x7fa2842571c5]
  26. /lib/x86_64-linux-gnu/libpthread.so.0(+0x10340)[0x7fa282fe6340]
  27. /usr/sbin/mysqld(+0x5de4ad)[0x7fa2844594ad]
  28. /usr/sbin/mysqld(+0x5df3fc)[0x7fa28445a3fc]
  29. /usr/sbin/mysqld(+0x5ccba0)[0x7fa284447ba0]
  30. /usr/sbin/mysqld(+0x5ce49d)[0x7fa28444949d]
  31. /usr/sbin/mysqld(+0x5709e7)[0x7fa2843eb9e7]
  32. /usr/sbin/mysqld(+0x57b2a0)[0x7fa2843f62a0]
  33. /usr/sbin/mysqld(+0x57bbcb)[0x7fa2843f6bcb]
  34. /usr/sbin/mysqld(+0x56caa6)[0x7fa2843e7aa6]
  35. /usr/sbin/mysqld(+0x5b4f1a)[0x7fa28442ff1a]
  36. /usr/sbin/mysqld(+0x57ea93)[0x7fa2843f9a93]
  37. /usr/sbin/mysqld(+0x52fc39)[0x7fa2843aac39]
  38. /usr/sbin/mysqld(+0x4fef98)[0x7fa284379f98]
  39. /usr/sbin/mysqld(_Z24ha_initialize_handlertonP13st_plugin_int+0x41)[0x7fa2842591f1]
  40. /usr/sbin/mysqld(+0x302d11)[0x7fa28417dd11]
  41. /usr/sbin/mysqld(_Z11plugin_initPiPPci+0x92a)[0x7fa284181d0a]
  42. /usr/sbin/mysqld(+0x28b2ab)[0x7fa2841062ab]
  43. /usr/sbin/mysqld(_Z11mysqld_mainiPPc+0x45b)[0x7fa28410ac0b]
  44. /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5)[0x7fa282628ec5]
  45. /usr/sbin/mysqld(+0x287168)[0x7fa284102168]
  46. The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
  47. information that should help you find out what is causing the crash.

вот в этом месте и пришло осознание…. приехали. Читать