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  1. MariaDB Server
  2. MDEV-24101

innodb_random_read_ahead=ON causes hang on DDL or shutdown

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      10.5 440d4b282d

      Version: '10.5.7-MariaDB-debug-log'  socket: '/home/mariadb/MDEV-24101/10.5/mysql-test/var/tmp/mysqld.1.sock'  port: 16000  Source distribution
      2020-11-03  1:43:49 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:43:59 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:44:09 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:44:19 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:44:29 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:44:39 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:44:49 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:44:59 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:45:10 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:45:20 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:45:30 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:45:40 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:45:50 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:46:00 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:46:10 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:46:20 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:46:30 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:46:41 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:46:51 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:47:01 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:47:11 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:47:21 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:47:31 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:47:41 9 [Warning] InnoDB: Trying to delete tablespace 'test/#sql-backup-8cbd-9' but there are 3 pending operations on it.
      2020-11-03  1:47:49 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635575420672 has waited at dict0dict.cc line 943 for 241.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:47:49 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635056432896 has waited at dict0dict.cc line 943 for 241.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:47:49 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635091044096 has waited at dict0dict.cc line 943 for 241.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
       
      <...>
       
      2020-11-03  1:48:56 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635595351808 has waited at dict0stats_bg.cc line 348 for 299.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:56 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635575420672 has waited at dict0dict.cc line 943 for 308.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:56 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635056432896 has waited at dict0dict.cc line 943 for 308.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:56 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635091044096 has waited at dict0dict.cc line 943 for 308.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:56 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635080554240 has waited at dict0dict.cc line 943 for 308.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:56 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635583813376 has waited at srv0srv.cc line 1603 for 307.00 seconds the semaphore:
      X-lock on RW-latch at 0x5642ff699478 created in file dict0dict.cc line 1041
      a writer (thread id 139635024963328) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 3314
      2020-11-03  1:48:56 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635595351808 has waited at dict0stats_bg.cc line 348 for 299.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
      InnoDB: Pending reads 0, writes 0
      InnoDB: ###### Diagnostic info printed to the standard error stream
      2020-11-03  1:48:57 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635575420672 has waited at dict0dict.cc line 943 for 309.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:57 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635056432896 has waited at dict0dict.cc line 943 for 309.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:57 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635091044096 has waited at dict0dict.cc line 943 for 309.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:57 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635080554240 has waited at dict0dict.cc line 943 for 309.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:57 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635583813376 has waited at srv0srv.cc line 1603 for 308.00 seconds the semaphore:
      X-lock on RW-latch at 0x5642ff699478 created in file dict0dict.cc line 1041
      a writer (thread id 139635024963328) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 3314
      2020-11-03  1:48:57 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635595351808 has waited at dict0stats_bg.cc line 348 for 300.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:57 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635575420672 has waited at dict0dict.cc line 943 for 309.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:57 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635056432896 has waited at dict0dict.cc line 943 for 309.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:57 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635091044096 has waited at dict0dict.cc line 943 for 309.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:57 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635080554240 has waited at dict0dict.cc line 943 for 309.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:57 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635583813376 has waited at srv0srv.cc line 1603 for 308.00 seconds the semaphore:
      X-lock on RW-latch at 0x5642ff699478 created in file dict0dict.cc line 1041
      a writer (thread id 139635024963328) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 3314
      2020-11-03  1:48:57 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635595351808 has waited at dict0stats_bg.cc line 348 for 300.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
      InnoDB: Pending reads 0, writes 0
      InnoDB: ###### Diagnostic info printed to the standard error stream
      2020-11-03  1:48:58 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635575420672 has waited at dict0dict.cc line 943 for 310.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:58 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635056432896 has waited at dict0dict.cc line 943 for 310.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:58 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635091044096 has waited at dict0dict.cc line 943 for 310.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:58 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635080554240 has waited at dict0dict.cc line 943 for 310.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:58 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635583813376 has waited at srv0srv.cc line 1603 for 309.00 seconds the semaphore:
      X-lock on RW-latch at 0x5642ff699478 created in file dict0dict.cc line 1041
      a writer (thread id 139635024963328) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 3314
      2020-11-03  1:48:58 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635595351808 has waited at dict0stats_bg.cc line 348 for 301.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:58 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635575420672 has waited at dict0dict.cc line 943 for 310.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:58 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635056432896 has waited at dict0dict.cc line 943 for 310.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:58 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635091044096 has waited at dict0dict.cc line 943 for 310.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:58 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635080554240 has waited at dict0dict.cc line 943 for 310.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:58 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635583813376 has waited at srv0srv.cc line 1603 for 309.00 seconds the semaphore:
      X-lock on RW-latch at 0x5642ff699478 created in file dict0dict.cc line 1041
      a writer (thread id 139635024963328) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 3314
      2020-11-03  1:48:58 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635595351808 has waited at dict0stats_bg.cc line 348 for 301.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
      InnoDB: Pending reads 0, writes 0
      InnoDB: ###### Diagnostic info printed to the standard error stream
      2020-11-03  1:48:59 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635575420672 has waited at dict0dict.cc line 943 for 311.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:59 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635056432896 has waited at dict0dict.cc line 943 for 311.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:59 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635091044096 has waited at dict0dict.cc line 943 for 311.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:59 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635080554240 has waited at dict0dict.cc line 943 for 311.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:59 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635583813376 has waited at srv0srv.cc line 1603 for 310.00 seconds the semaphore:
      X-lock on RW-latch at 0x5642ff699478 created in file dict0dict.cc line 1041
      a writer (thread id 139635024963328) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 3314
      2020-11-03  1:48:59 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 139635595351808 has waited at dict0stats_bg.cc line 348 for 302.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:59 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635575420672 has waited at dict0dict.cc line 943 for 311.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:59 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635056432896 has waited at dict0dict.cc line 943 for 311.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:59 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635091044096 has waited at dict0dict.cc line 943 for 311.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:59 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635080554240 has waited at dict0dict.cc line 943 for 311.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      2020-11-03  1:48:59 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635583813376 has waited at srv0srv.cc line 1603 for 310.00 seconds the semaphore:
      X-lock on RW-latch at 0x5642ff699478 created in file dict0dict.cc line 1041
      a writer (thread id 139635024963328) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 3314
      2020-11-03  1:48:59 0 [Note] InnoDB: A semaphore wait:
      --Thread 139635595351808 has waited at dict0stats_bg.cc line 348 for 302.00 seconds the semaphore:
      Mutex at 0x5642ff6993e0, Mutex DICT_SYS created /home/mariadb/MDEV-24101/10.5/storage/innobase/dict/dict0dict.cc:1032, lock var 2
      Last time reserved in file /home/mariadb/MDEV-24101/10.5/storage/innobase/row/row0mysql.cc line 3314
      InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
      InnoDB: Pending reads 0, writes 0
      InnoDB: ###### Diagnostic info printed to the standard error stream
      2020-11-03  1:48:59 0 [ERROR] [FATAL] InnoDB: Semaphore wait has lasted > 300 seconds. We intentionally crash the server because it appears to be hung.
      201103  1:48:59 [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: 10.5.7-MariaDB-debug-log
      key_buffer_size=134217728
      read_buffer_size=131072
      max_used_connections=3
      max_threads=153
      thread_count=4
      It is possible that mysqld could use up to 
      key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 193789 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 = 0x0 thread_stack 0x49000
      /home/mariadb/MDEV-24101/10.5/sql/mariadbd(my_print_stacktrace+0x40)[0x5642fe86b833]
      mysys/stacktrace.c:212(my_print_stacktrace)[0x5642fdf2979b]
      ??:0(__restore_rt)[0x7eff8205c8a0]
      linux/raise.c:51(__GI_raise)[0x7eff81154f47]
      stdlib/abort.c:81(__GI_abort)[0x7eff811568b1]
      /home/mariadb/MDEV-24101/10.5/sql/mariadbd(+0x1376741)[0x5642fe627741]
      /home/mariadb/MDEV-24101/10.5/sql/mariadbd(+0x1306b93)[0x5642fe5b7b93]
      ut/ut0ut.cc:580(ib::fatal::~fatal())[0x5642fe7c858a]
      srv/srv0srv.cc:1431(srv_error_monitor_task)[0x5642fe7c8678]
      tpool/tpool_generic.cc:300(tpool::thread_pool_generic::timer_generic::run())[0x5642fe7cd74d]
      tpool/task.cc:53(tpool::task::execute())[0x5642fe7c6e2e]
      tpool/tpool_generic.cc:516(tpool::thread_pool_generic::worker_main(tpool::worker_data*))[0x5642fe7ca1d5]
      bits/invoke.h:73(void std::__invoke_impl<void, void (tpool::thread_pool_generic::*)(tpool::worker_data*), tpool::thread_pool_generic*, tpool::worker_data*>(std::__invoke_memfun_deref, void (tpool::thread_pool_generic::*&&)(tpool::worker_data*), tpool::thread_pool_generic*&&, tpool::worker_data*&&))[0x5642fe7c94c1]
      bits/invoke.h:95(std::__invoke_result<void (tpool::thread_pool_generic::*)(tpool::worker_data*), tpool::thread_pool_generic*, tpool::worker_data*>::type std::__invoke<void (tpool::thread_pool_generic::*)(tpool::worker_data*), tpool::thread_pool_generic*, tpool::worker_data*>(void (tpool::thread_pool_generic::*&&)(tpool::worker_data*), tpool::thread_pool_generic*&&, tpool::worker_data*&&))[0x5642fe7cd055]
      7/thread:234(decltype (__invoke((_S_declval<0ul>)(), (_S_declval<1ul>)(), (_S_declval<2ul>)())) std::thread::_Invoker<std::tuple<void (tpool::thread_pool_generic::*)(tpool::worker_data*), tpool::thread_pool_generic*, tpool::worker_data*> >::_M_invoke<0ul, 1ul, 2ul>(std::_Index_tuple<0ul, 1ul, 2ul>))[0x5642fe7ccfef]
      7/thread:243(std::thread::_Invoker<std::tuple<void (tpool::thread_pool_generic::*)(tpool::worker_data*), tpool::thread_pool_generic*, tpool::worker_data*> >::operator()())[0x5642fe7ccfce]
      ??:0(std::error_code::default_error_condition() const)[0x7eff81b7a6df]
      nptl/pthread_create.c:463(start_thread)[0x7eff820516db]
      x86_64/clone.S:97(clone)[0x7eff81237a3f]
      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 /dev/shm/var_auto_gcO5/mysqld.1/data
      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             128241               128241               processes 
      Max open files            1024                 1024                 files     
      Max locked memory         16777216             16777216             bytes     
      Max address space         unlimited            unlimited            bytes     
      Max file locks            unlimited            unlimited            locks     
      Max pending signals       128241               128241               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: |/usr/share/apport/apport %p %s %c %d %P %E
       
      ----------SERVER LOG END-------------
      

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              marko Marko Mäkelä
              elenst Elena Stepanova
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