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I'm essentially facing two problems.
1)
every few days I'm getting... (db/table/col names manually obfuscated below)
2022-05-29 5:54:28 226 [ERROR] InnoDB: Database page corruption on disk or a failed read of file './xxxxdb/bad_table.ibd' page [page id: space=386040, page number=1446430]. You may have to recover from a backup.
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2022-05-29 5:54:28 226 [Note] InnoDB: Page dump in ascii and hex (16384 bytes):
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len 16384; hex ...
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InnoDB: End of page dump
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2022-05-29 5:54:28 226 [Note] InnoDB: Uncompressed page, stored checksum in field1 642196308, calculated checksums for field1: crc32 3586801619, innodb 1305855102, page type 10 == BLOB.none 3735928559, stored checksum in field2 642196308, calculated checksums for field2: crc32 3586801619, innodb 1806045908, none 3735928559, page LSN 3289 3616289816, low 4 bytes of LSN at page end 3616289816, page number (if stored to page already) 1446430, space id (if create with >= MySQL-4.1.1 and stored already) 386040
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InnoDB: Page may be a BLOB page
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2022-05-29 5:54:28 226 [Note] InnoDB: You can use CHECK TABLE to scan your table for corruption. Please refer to https://mariadb.com/kb/en/library/innodb-recovery-modes/ for information about forcing recovery.
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I don't know if this is i) a bug, ii) failing memory or iii) failing disk. It happens with a variety of tables and happens for about 5 seconds, logging this about 20 times per second, before...
Sometimes (I think the pattern probably has more to do with my application querying MariaDB, then MariaDB itself?) it then goes...
2022-05-27 0:03:55 353 [ERROR] InnoDB: We detected index corruption in an InnoDB type table. You have to dump + drop + reimport the table or, in a case of widespread corruption, dump all InnoDB tables and recreate the whole tablespace. If the mysqld server crashes after the startup or when you dump the tables. Please refer to https://mariadb.com/kb/en/library/innodb-recovery-modes/ for information about forcing recovery.
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2022-05-27 0:03:55 353 [ERROR] mariadbd: Index for table 'bad_table' is corrupt; try to repair it
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but others times it then hits the second, more serious, problem...
2)
220529 5:54:33 [ERROR] mysqld got signal 11 ;
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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.
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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 diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail.
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Server version: 10.5.15-MariaDB-0+deb11u1-log
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key_buffer_size=402653184
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read_buffer_size=2097152
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max_used_connections=2
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max_threads=153
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thread_count=2
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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 = 1963808 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: 0x7f9a5c000c58
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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...
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stack_bottom = 0x7f9bdc054d78 thread_stack 0x30000
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??:0(my_print_stacktrace)[0x55d6fdc5154e]
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??:0(handle_fatal_signal)[0x55d6fd750f65]
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sigaction.c:0(__restore_rt)[0x7f9be0732140]
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??:0(std::unique_lock<std::mutex>::unlock())[0x55d6fdb455b4]
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??:0(std::unique_lock<std::mutex>::unlock())[0x55d6fdb51a96]
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??:0(std::unique_lock<std::mutex>::unlock())[0x55d6fdaed4ea]
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??:0(std::unique_lock<std::mutex>::unlock())[0x55d6fdaed90c]
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??:0(std::unique_lock<std::mutex>::unlock())[0x55d6fdaf469d]
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??:0(wsrep_notify_status(wsrep::server_state::state, wsrep::view const*))[0x55d6fda37b42]
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??:0(handler::ha_index_read_map(unsigned char*, unsigned char const*, unsigned long, ha_rkey_function))[0x55d6fd756bd8]
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??:0(cp_buffer_from_ref(THD*, TABLE*, st_table_ref*))[0x55d6fd5a8254]
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??:0(sub_select(JOIN*, st_join_table*, bool))[0x55d6fd59480e]
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??:0(Item_bool_func2::remove_eq_conds(THD*, Item::cond_result*, bool))[0x55d6fd580fec]
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??:0(sub_select(JOIN*, st_join_table*, bool))[0x55d6fd5948a3]
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??:0(JOIN::exec_inner())[0x55d6fd5bee38]
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??:0(JOIN::exec())[0x55d6fd5bf295]
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??:0(mysql_select(THD*, TABLE_LIST*, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*))[0x55d6fd5bd116]
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??:0(mysql_multi_update(THD*, TABLE_LIST*, List<Item>*, List<Item>*, Item*, unsigned long long, enum_duplicates, bool, st_select_lex_unit*, st_select_lex*, multi_update**))[0x55d6fd6109ed]
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??:0(mysql_execute_command(THD*))[0x55d6fd55b0b4]
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??:0(mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool))[0x55d6fd55c5db]
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??:0(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool))[0x55d6fd55ea5d]
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??:0(do_command(THD*))[0x55d6fd5602de]
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??:0(do_handle_one_connection(CONNECT*, bool))[0x55d6fd651fb2]
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??:0(handle_one_connection)[0x55d6fd65222d]
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??:0(MyCTX_nopad::finish(unsigned char*, unsigned int*))[0x55d6fd98e11b]
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nptl/pthread_create.c:478(start_thread)[0x7f9be0726ea7]
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x86_64/clone.S:97(__GI___clone)[0x7f9be033ddef]
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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 (0x7f9a5c010470): update bad_table p, table2 n set p.n_col=n.n_col where p.colID=n.colID and n.col1=p.col1 and p.col='xx'
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Connection ID (thread ID): 226
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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,materialization=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_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,not_null_range_scan=off
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The manual page at https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mysqld/ contains 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 /mnt/disk3/mysqldata
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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 0 unlimited bytes
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Max resident set unlimited unlimited bytes
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Max processes 62978 62978 processes
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Max open files 32768 32768 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 62978 62978 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: core
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2022-05-29 5:54:38 0 [Note] Using unique option prefix 'myisam-recover' is error-prone and can break in the future. Please use the full name 'myisam-recover-options' instead.
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2022-05-29 5:54:38 0 [Note] CONNECT: Version 1.07.0002 March 22, 2021
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2022-05-29 5:54:38 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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2022-05-29 5:54:38 0 [Note] InnoDB: !!! innodb_force_recovery is set to 1 !!!
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2022-05-29 5:54:38 0 [Note] InnoDB: Uses event mutexes
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2022-05-29 5:54:38 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
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2022-05-29 5:54:38 0 [Note] InnoDB: Number of pools: 1
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2022-05-29 5:54:38 0 [Note] InnoDB: Using crc32 + pclmulqdq instructions
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2022-05-29 5:54:39 0 [Note] InnoDB: Using Linux native AIO
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2022-05-29 5:54:39 0 [Note] InnoDB: Initializing buffer pool, total size = 4294967296, chunk size = 134217728
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2022-05-29 5:54:39 0 [Note] InnoDB: Completed initialization of buffer pool
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2022-05-29 5:54:39 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=14858023269921,14858023269921
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2022-05-29 5:54:40 0 [Note] InnoDB: Starting final batch to recover 17480 pages from redo log.
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2022-05-29 5:54:41 0 [Note] InnoDB: 128 rollback segments are active.
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2022-05-29 5:54:41 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
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2022-05-29 5:54:41 0 [Note] InnoDB: Creating shared tablespace for temporary tables
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2022-05-29 5:54:41 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
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2022-05-29 5:54:41 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
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2022-05-29 5:54:41 0 [Note] InnoDB: 10.5.15 started; log sequence number 14858195549968; transaction id 5082853300
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2022-05-29 5:54:41 0 [Note] InnoDB: Loading buffer pool(s) from /mnt/disk3/mysqldata/ib_buffer_pool
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2022-05-29 5:54:41 0 [Note] Plugin 'FEEDBACK' is disabled.
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2022-05-29 5:54:41 0 [ERROR] mariadbd: Plugin 'CONNECT' already installed
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2022-05-29 5:54:41 0 [Note] Server socket created on IP: '0.0.0.0'.
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2022-05-29 5:54:41 0 [Note] Reading of all Master_info entries succeeded
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2022-05-29 5:54:41 0 [Note] Added new Master_info '' to hash table
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2022-05-29 5:54:41 0 [Note] /usr/sbin/mariadbd: ready for connections.
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Version: '10.5.15-MariaDB-0+deb11u1-log' socket: '/run/mysqld/mysqld.sock' port: 3306 Debian 11
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2022-05-29 5:54:41 5 [Warning] ./sqlite3/xxxx.frm is inconsistent: engine typecode 44, engine name CONNECT (46)
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2022-05-29 5:54:41 0 [Note] InnoDB: Buffer pool(s) load completed at 220529 5:54:41
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once MariaDB is running again, my application starts querying again and the process repeats. I usually stop my application, mysqlcheck/repair/restore the table before re starting it again.
The segfault is caused by a variety of different queries accessing the corrupt table(s) in different ways, but each time it's the std::unique_lock<std::mutex>::unlock() that seems to be responsible for the segfault. It's particularly sad when the resulting CHECK TABLE/OPTIMIZE TABLE cause the segfault too :-/ e.g.
Thread pointer: 0x7fa500003648
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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 = 0x7fa678090d78 thread_stack 0x30000
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??:0(my_print_stacktrace)[0x55d8e417954e]
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??:0(handle_fatal_signal)[0x55d8e3c78f65]
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sigaction.c:0(__restore_rt)[0x7fa67c481140]
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??:0(std::unique_lock<std::mutex>::unlock())[0x55d8e3ffba71]
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??:0(std::unique_lock<std::mutex>::unlock())[0x55d8e3ffd13a]
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??:0(wsrep_notify_status(wsrep::server_state::state, wsrep::view const*))[0x55d8e3f77f15]
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??:0(mysql_alter_table(THD*, st_mysql_const_lex_string const*, st_mysql_const_lex_string const*, HA_CREATE_INFO*, TABLE_LIST*, Alter_info*, unsigned int, st_order*, bool, bool))[0x55d8e3b247cb]
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??:0(mysql_recreate_table(THD*, TABLE_LIST*, bool))[0x55d8e3b25017]
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??:0(MDL_ticket::~MDL_ticket())[0x55d8e3b84f3d]
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??:0(MDL_ticket::~MDL_ticket())[0x55d8e3b86dcc]
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??:0(Sql_cmd_optimize_table::execute(THD*))[0x55d8e3b87f0d]
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??:0(mysql_execute_command(THD*))[0x55d8e3a80356]
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??:0(mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool))[0x55d8e3a845db]
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??:0(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool))[0x55d8e3a86a5d]
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??:0(do_command(THD*))[0x55d8e3a882de]
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??:0(do_handle_one_connection(CONNECT*, bool))[0x55d8e3b79fb2]
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??:0(handle_one_connection)[0x55d8e3b7a22d]
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??:0(MyCTX_nopad::finish(unsigned char*, unsigned int*))[0x55d8e3eb611b]
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nptl/pthread_create.c:478(start_thread)[0x7fa67c475ea7]
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x86_64/clone.S:97(__GI___clone)[0x7fa67c08cdef]
|
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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 (0x7fa500011cd0): OPTIMIZE TABLE `bad_table`
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Connection ID (thread ID): 212
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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,materialization=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_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,not_null_range_scan=off
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I don't suppose there's much that can easily be done to track down the first problem, but it would be great if the segfault could be fixed, so at least MariaDB stays up and carries on handling queries for the non-corrupt tables.
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