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  1. MariaDB Server
  2. MDEV-24035

Failing assertion: UT_LIST_GET_LEN(lock.trx_locks) == 0 causing disruption and replication failure

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      See below error dump, happens sporadically (every 2 to 3 weeks) resulting in dropping of all connections and evacuation of cache taking around 20 seconds to recover. In each case it is a random simple select that causes the issue. All tables are innodb and have been mysqlcheck'd with no issue found. Issue did not occur under 10.4 but coincided with move to 10.5.5. System is not under excessive load at the time the problems manifests. Recent upgrade to 10.5.6 has not resolved the issue

      IMPORTANT : Knock on effect for replication slaves is duplicate records causing replication to fail - so this effectively looks like two bugs (duplicate updates can be skipped). I believe the assertion failure handling may be causing this secondary serious issue :

      1) assertion failure on master host
      2) replication failure on slave host

      2020-10-21 14:47:03 0x7f45b0c42700  InnoDB: Assertion failure in file /home/buildbot/buildbot/padding_for_CPACK_RPM_BUILD_SOURCE_DIRS_PREFIX/mariadb-10.5.5/storage/innobase/trx/trx0trx.cc line 1329
      InnoDB: Failing assertion: UT_LIST_GET_LEN(lock.trx_locks) == 0
      InnoDB: We intentionally generate a memory trap.
      InnoDB: Submit a detailed bug report to https://jira.mariadb.org/
      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: https://mariadb.com/kb/en/library/innodb-recovery-modes/
      InnoDB: about forcing recovery.
      201021 14:47:03 [ERROR] 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.
       
      To report this bug, see https://mariadb.com/kb/en/reporting-bugs
       
      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.
       
      Server version: 10.5.5-MariaDB-log
      key_buffer_size=67108864
      read_buffer_size=1048576
      max_used_connections=1137
      max_threads=1252
      thread_count=486
      It is possible that mysqld could use up to
      key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 2660907 K  bytes of memory
      Hope that's ok; if not, decrease some variables in the equation.
       
      Thread pointer: 0x7f43a0064958
      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 = 0x7f45b0c41c90 thread_stack 0x49000
      Can't start addr2line
      /usr/sbin/mariadbd(my_print_stacktrace+0x2e)[0x556585139f3e]
      /usr/sbin/mariadbd(handle_fatal_signal+0x307)[0x556584b3c607]
      /lib64/libpthread.so.0(+0xf630)[0x7f7d8a62e630]
      /lib64/libc.so.6(gsignal+0x37)[0x7f7d88688387]
      /lib64/libc.so.6(abort+0x148)[0x7f7d88689a78]
      /usr/sbin/mariadbd(+0x64c5e7)[0x55658481a5e7]
      /usr/sbin/mariadbd(+0xda9197)[0x556584f77197]
      /usr/sbin/mariadbd(+0xda92c3)[0x556584f772c3]
      /usr/sbin/mariadbd(+0xda95a4)[0x556584f775a4]
      /usr/sbin/mariadbd(+0xc4b6cc)[0x556584e196cc]
      /usr/sbin/mariadbd(+0xc56723)[0x556584e24723]
      /usr/sbin/mariadbd(_ZN7handler16ha_external_lockEP3THDi+0x261)[0x556584b48681]
      /usr/sbin/mariadbd(+0xa6ae7a)[0x556584c38e7a]
      /usr/sbin/mariadbd(_Z24mysql_unlock_read_tablesP3THDP13st_mysql_lock+0x72)[0x556584c39702]
      /usr/sbin/mariadbd(_ZN4JOIN9join_freeEv+0x169)[0x556584976cb9]
      /usr/sbin/mariadbd(_ZN4JOIN10exec_innerEv+0xc6c)[0x55658499b55c]
      /usr/sbin/mariadbd(_ZN4JOIN4execEv+0x33)[0x55658499b813]
      /usr/sbin/mariadbd(_Z12mysql_selectP3THDP10TABLE_LISTR4ListI4ItemEPS4_jP8st_orderS9_S7_S9_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x186)[0x5565849999d6]
      /usr/sbin/mariadbd(_Z13handle_selectP3THDP3LEXP13select_resultm+0x1cc)[0x55658499a53c]
      /usr/sbin/mariadbd(+0x63343a)[0x55658480143a]
      /usr/sbin/mariadbd(_Z21mysql_execute_commandP3THD+0x37f5)[0x556584940605]
      /usr/sbin/mariadbd(_Z11mysql_parseP3THDPcjP12Parser_statebb+0x36a)[0x55658494350a]
      /usr/sbin/mariadbd(_Z16dispatch_command19enum_server_commandP3THDPcjbb+0x1bbd)[0x55658494587d]
      /usr/sbin/mariadbd(_Z10do_commandP3THD+0x10b)[0x55658494701b]
      /usr/sbin/mariadbd(_Z24do_handle_one_connectionP7CONNECTb+0x1b2)[0x556584a2fb32]
      /usr/sbin/mariadbd(handle_one_connection+0x34)[0x556584a2fde4]
      /usr/sbin/mariadbd(+0xbb62ad)[0x556584d842ad]
      /lib64/libpthread.so.0(+0x7ea5)[0x7f7d8a626ea5]
      /lib64/libc.so.6(clone+0x6d)[0x7f7d887508dd]
       
      Trying to get some variables.
      Some pointers may be invalid and cause the dump to abort.
      Query (0x7f43a0074710): SELECT * FROM `lookup_permissions_grid` WHERE  `application` IN ('guest')
      Connection ID (thread ID): 187768692
      Status: NOT_KILLED
       
      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
       
      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.
      Writing a core file...
      Working directory at /mnt/db/mysql
      Resource Limits:
      Limit                     Soft Limit           Hard Limit           Units
      Max cpu time              unlimited            unlimited            seconds
      Max file size             unlimited            unlimited            bytes
      Max data size             unlimited            unlimited            bytes
      Max stack size            8388608              unlimited            bytes
      Max core file size        0                    unlimited            bytes
      Max resident set          unlimited            unlimited            bytes
      Max processes             1030944              1030944              processes
      Max open files            16384                16384                files
      Max locked memory         65536                65536                bytes
      Max address space         unlimited            unlimited            bytes
      Max file locks            unlimited            unlimited            locks
      Max pending signals       1030944              1030944              signals
      Max msgqueue size         819200               819200               bytes
      Max nice priority         0                    0
      Max realtime priority     0                    0
      Max realtime timeout      unlimited            unlimited            us
      Core pattern: core
       
      2020-10-21 14:47:27 0 [Note] mariadbd: Aria engine: starting recovery
      tables to flush: 2 1 0
       (0.0 seconds);
      2020-10-21 14:47:27 0 [Note] mariadbd: Aria engine: recovery done
      

      mysqld --print-defaults
      mysqld would have been started with the following arguments:

      --datadir=/mnt/db/mysql --tmpdir=/var/lib/mysqltmp --sql-mode=STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION --userstat=1 --log_warnings=2 --thread_handling=one-thread-per-connection --thread-cache-size=16 --table-open-cache=4096 --table-definition-cache=2048 --query-cache-type=0 --sort-buffer-size=1M --read-buffer-size=1M --read-rnd-buffer-size=1M --join-buffer-size=1M --tmp-table-size=128M --max-heap-table-size=128M --back-log=100 --max-connections=1250 --max-connect-errors=10000 --max-allowed-packet=16M --interactive-timeout=28800 --wait-timeout=28800 --default-storage-engine=InnoDB --innodb=FORCE --key-buffer-size=64M --myisam-sort-buffer-size=128M --innodb-buffer-pool-size=224256M --innodb-log-file-size=100M --innodb-file-per-table=1 --innodb-open-files=4096 --innodb_flush_log_at_trx_commit=0 --innodb_buffer_pool_instances=16 --innodb_flush_method=O_DIRECT --log-output=FILE --slow-query-log=1 --slow-query-log-file=/mnt/db/mysql_slow.log --long-query-time=1 --character-set-server=utf8 --group_concat_max_len=40960 --log-error=/mnt/db/mysqld.log --open-files-limit=65535 --server-id=1 --gtid-domain-id=1 --log-bin=/mnt/db/mysqllogs/bin-log --relay-log-space-limit=16G --expire-logs-days=2 --sync-binlog=0 --innodb_io_capacity=2000 --innodb_thread_concurrency=0
      

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              psergei Sergei Petrunia
              marnixgb Martin Nix
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                Updated:

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