Details
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Bug
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Status: Closed (View Workflow)
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Critical
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Resolution: Fixed
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10.4.19, 10.5.10, 10.4(EOL), 10.5, 10.6
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None
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OS: CloudLinux like RHEL - Kernel 4.18.0-147.8.1.el8.lve.1.x86_64
Description
We run rather large production servers with over hundreds of databases with varying sizes between a few MB and many GB.
Over the past few days we noticed that sometimes MariaDB seems to quit responding on our production servers.
We found out that this behaviour can be triggered if someone updates their WordPress website. When WordPress is updated it also performs some database queries to convert tables to utf8mb4.
E.g. the following query is done:
ALTER TABLE wp_usermeta CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci
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This causes MariaDB to complete stop responding for about 15 seconds and than recovers.
This is very unwanted behaviour because customers keep trying to update their website causing MariaDB to not respond multiple times over a short duration.
The following is logged during the crash:
2021-06-16 14:46:11 0x7fcc332b3700 InnoDB: Assertion failure in file /builddir/build/BUILD/mariadb-10.4.19/storage/innobase/data/data0type.cc line 67
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InnoDB: Failing assertion: !(prefix_len % mbmaxlen)
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InnoDB: We intentionally generate a memory trap.
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InnoDB: Submit a detailed bug report to https://jira.mariadb.org/
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InnoDB: If you get repeated assertion failures or crashes, even
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InnoDB: immediately after the mysqld startup, there may be
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InnoDB: corruption in the InnoDB tablespace. Please refer to
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InnoDB: https://mariadb.com/kb/en/library/innodb-recovery-modes/
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InnoDB: about forcing recovery.
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210616 14:46:11 [ERROR] mysqld got signal 6 ;
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This could be because you hit a bug. It is also possible that this binary
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or one of the libraries it was linked against is corrupt, improperly built,
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or misconfigured. This error can also be caused by malfunctioning hardware.
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To report this bug, see https://mariadb.com/kb/en/reporting-bugs
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We will try our best to scrape up some info that will hopefully help
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diagnose the problem, but since we have already crashed,
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something is definitely wrong and this may fail.
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Server version: 10.4.19-MariaDB-log-cll-lve
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key_buffer_size=67108864
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read_buffer_size=1048576
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max_used_connections=32
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max_threads=502
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thread_count=24
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It is possible that mysqld could use up to
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key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1106098 K bytes of memory
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Hope that's ok; if not, decrease some variables in the equation.
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Thread pointer: 0x7fcc0b149388
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Attempting backtrace. You can use the following information to find out
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where mysqld died. If you see no messages after this, something went
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terribly wrong...
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stack_bottom = 0x7fcc332b13d8 thread_stack 0x40000
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/usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x561d6dcc656e]
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/usr/sbin/mysqld(handle_fatal_signal+0x54d)[0x561d6d7b5d9d]
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sigaction.c:0(__restore_rt)[0x7fcc68745b30]
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:0(__GI_raise)[0x7fcc67a8c84f]
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:0(__GI_abort)[0x7fcc67a76c45]
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/usr/sbin/mysqld(+0x5b52a8)[0x561d6d4a92a8]
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/usr/sbin/mysqld(+0x5c11d7)[0x561d6d4b51d7]
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/usr/sbin/mysqld(+0xb135f3)[0x561d6da075f3]
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/usr/sbin/mysqld(+0xb1b573)[0x561d6da0f573]
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/usr/sbin/mysqld(+0xb1dff1)[0x561d6da11ff1]
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/usr/sbin/mysqld(+0xa81618)[0x561d6d975618]
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/usr/sbin/mysqld(_Z17mysql_alter_tableP3THDPK25st_mysql_const_lex_stringS3_P14HA_CREATE_INFOP10TABLE_LISTP10Alter_infojP8st_orderb+0x3dc7)[0x561d6d646377]
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/usr/sbin/mysqld(_ZN19Sql_cmd_alter_table7executeEP3THD+0x347)[0x561d6d69ac37]
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/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x137e)[0x561d6d5a862e]
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/usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_statebb+0x2c5)[0x561d6d5aeeb5]
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/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcjbb+0x1602)[0x561d6d5b1412]
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/usr/sbin/mysqld(_Z10do_commandP3THD+0x13a)[0x561d6d5b28ca]
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/usr/sbin/mysqld(_Z24do_handle_one_connectionP7CONNECT+0x25e)[0x561d6d6967de]
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/usr/sbin/mysqld(handle_one_connection+0x3d)[0x561d6d6968ad]
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pthread_create.c:0(start_thread)[0x7fcc6873b15a]
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/lib64/libc.so.6(clone+0x43)[0x7fcc67b51f73]
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Trying to get some variables.
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Some pointers may be invalid and cause the dump to abort.
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Query (0x7fcc02b64c60): ALTER TABLE wp_usermeta CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci
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Connection ID (thread ID): 4914
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Status: NOT_KILLED
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Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,m
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aterialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_
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cache_bka=on,optimize_join_buffer_size=on,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on,condition_pushdown_for_subquery=on,rowid_filter=on,condition_pushdown_from_having=on
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The manual page at https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mysqld/ contains
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information that should help you find out what is causing the crash.
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Writing a core file...
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Working directory at /var/lib/mysql
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Resource Limits:
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Limit Soft Limit Hard Limit Units
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Max cpu time unlimited unlimited seconds
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Max file size unlimited unlimited bytes
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Max data size unlimited unlimited bytes
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Max stack size 8388608 unlimited bytes
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Max core file size unlimited unlimited bytes
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Max resident set unlimited unlimited bytes
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Max processes 514122 514122 processes
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Max open files 51200 51200 files
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Max locked memory 65536 65536 bytes
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Max address space unlimited unlimited bytes
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Max file locks unlimited unlimited locks
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Max pending signals 514122 514122 signals
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Max msgqueue size 819200 819200 bytes
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Max nice priority 0 0
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Max realtime priority 0 0
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Max realtime timeout unlimited unlimited us
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Core pattern: |/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h %e
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2021-06-16 14:46:18 0 [Warning] You need to use --log-bin to make --binlog-format work.
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2021-06-16 14:46:18 0 [Warning] The parameter innodb_file_format is deprecated and has no effect. It may be removed in future releases. See https://mariadb.com/kb/en/library/xtradbinnodb-file-format/
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2021-06-16 14:46:18 0 [Warning] InnoDB: Setting innodb_checksum_algorithm to values other than crc32, full_crc32, strict_crc32 or strict_full_crc32 is UNSAFE and DEPRECATED. These deprecated values will be disallowed in MariaDB 10.6.
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2021-06-16 14:46:18 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
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2021-06-16 14:46:18 0 [Note] InnoDB: Uses event mutexes
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2021-06-16 14:46:18 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
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2021-06-16 14:46:18 0 [Note] InnoDB: Number of pools: 1
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2021-06-16 14:46:18 0 [Note] InnoDB: Using SSE2 crc32 instructions
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2021-06-16 14:46:18 0 [Note] mysqld: O_TMPFILE is not supported on /var/lib/mysql_tmp (disabling future attempts)
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2021-06-16 14:46:18 0 [Note] InnoDB: Initializing buffer pool, total size = 256M, instances = 1, chunk size = 128M
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2021-06-16 14:46:18 0 [Note] InnoDB: Completed initialization of buffer pool
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2021-06-16 14:46:18 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
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2021-06-16 14:46:18 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=30378586209559
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2021-06-16 14:46:19 0 [Note] InnoDB: Starting final batch to recover 220 pages from redo log.
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2021-06-16 14:46:24 0 [Note] InnoDB: 128 out of 128 rollback segments are active.
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2021-06-16 14:46:24 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
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2021-06-16 14:46:24 0 [Note] InnoDB: Creating shared tablespace for temporary tables
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2021-06-16 14:46:24 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
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2021-06-16 14:46:24 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
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2021-06-16 14:46:24 0 [Note] InnoDB: Waiting for purge to start
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2021-06-16 14:46:24 0 [Note] InnoDB: 10.4.19 started; log sequence number 30378586621666; transaction id 47558113933
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2021-06-16 14:46:24 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
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2021-06-16 14:46:24 0 [Note] Plugin 'FEEDBACK' is disabled.
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2021-06-16 14:46:24 0 [Note] Server socket created on IP: '::'.
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2021-06-16 14:46:24 0 [Note] Reading of all Master_info entries succeeded
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2021-06-16 14:46:24 0 [Note] Added new Master_info '' to hash table
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2021-06-16 14:46:24 0 [Note] /usr/sbin/mysqld: ready for connections.
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Version: '10.4.19-MariaDB-log-cll-lve' socket: '/var/lib/mysql_sock/mysql.sock' port: 3306 MariaDB Server
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2021-06-16 14:46:24 0 [Note] InnoDB: Buffer pool(s) load completed at 210616 14:46:24
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Attachments
Issue Links
- is duplicated by
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- Closed
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- Closed
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- relates to
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- Closed
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- Closed
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- Closed
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