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  1. MariaDB Server
  2. MDEV-31393

partial server freeze after LOCK TABLES ...; FLUSH TABLES;

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    Description

      Scenario:
      1. Start the server and generate some initial data
      2. Two "worker" session runs a DDL/DML mix
      3. After some time the testing tool random query generator (RQG) detects that 
          one of the session running the DDL/DML mix is left over and has exceeded some
          threshold for the execution of its statement and assumes some server hang/freeze.
         - 21:19:51  (~ 352s after the "worker" session ID 17 started its activity) 
           ID -- COMMAND -- TIME -- INFO -- state
           13 -- Sleep -- 352 -- <undef> -- ok
           14 -- Killed -- 273 -- FLUSH TABLES /* E_R Thread1 QNO 1230 CON_ID 14 */ -- stalled?
           50 -- Query -- 0 -- SHOW FULL PROCESSLIST -- ok
        - 21:21:14   Why does ID 14  not switch to "Sleep"
           ID -- COMMAND -- TIME -- INFO -- state
           14 -- Killed -- 356 -- FLUSH TABLES /* E_R Thread1 QNO 1230 CON_ID 14 */
           60 -- Query -- 0 -- SHOW FULL PROCESSLIST
       
      # 2023-06-01T21:21:14 [446281] Reporter 'Deadlock': Content of processlist ---------- begin
      # 2023-06-01T21:21:14 [446281] Reporter 'Deadlock': ID -- COMMAND -- TIME -- INFO -- state
      # 2023-06-01T21:21:14 [446281] Reporter 'Deadlock': 13 -- Sleep -- 435 -- <undef> -- ok
      # 2023-06-01T21:21:14 [446281] Reporter 'Deadlock': 14 -- Killed -- 356 -- FLUSH TABLES /* E_R 
       
      pluto:/data/results/1685644381/Freeze$ gdb -c ./1/data/core /data/Server_bin/bb-10.6-MDEV-30986B_asan_Og/bin/mysqld
       
      Unfortunately I cannot exclude that RQG makes false alarm.
       
      RQG
      ===
      # git clone https://github.com/mleich1/rqg --branch <pick the right branch> RQG
      #
      # GIT_SHOW: HEAD -> master, origin/master, origin/HEAD 2cfe27f6ea2427e6d80314d26649e804d3bdf1c6 2023-05-26T16:45:32+02:00
      # rqg.pl  : Version 4.2.1 (2022-12)
      #
      # $RQG_HOME/rqg.pl \
      # --gendata=conf/engines/innodb/full_text_search.zz \
      # --max_gd_duration=1200 \
      # --short_column_names \
      # --grammar=conf/engines/innodb/full_text_search.yy \
      # --redefine=conf/mariadb/alter_table.yy \
      # --redefine=conf/mariadb/instant_add.yy \
      # --redefine=conf/mariadb/modules/alter_table_columns.yy \
      # --redefine=conf/mariadb/bulk_insert.yy \
      # --redefine=conf/mariadb/modules/foreign_keys.yy \
      # --redefine=conf/mariadb/modules/locks.yy \
      # --redefine=conf/mariadb/modules/sql_mode.yy \
      # --redefine=conf/mariadb/redefine_temporary_tables.yy \
      # --redefine=conf/mariadb/versioning.yy \
      # --redefine=conf/mariadb/sequences.yy \
      # --mysqld=--loose-innodb_lock_schedule_algorithm=fcfs \
      # --mysqld=--loose-idle_write_transaction_timeout=0 \
      # --mysqld=--loose-idle_transaction_timeout=0 \
      # --mysqld=--loose-idle_readonly_transaction_timeout=0 \
      # --mysqld=--connect_timeout=60 \
      # --mysqld=--interactive_timeout=28800 \
      # --mysqld=--slave_net_timeout=60 \
      # --mysqld=--net_read_timeout=30 \
      # --mysqld=--net_write_timeout=60 \
      # --mysqld=--loose-table_lock_wait_timeout=50 \
      # --mysqld=--wait_timeout=28800 \
      # --mysqld=--lock-wait-timeout=86400 \
      # --mysqld=--innodb-lock-wait-timeout=50 \
      # --no_mask \
      # --queries=10000000 \
      # --seed=random \
      # --reporters=None \
      # --reporters=ErrorLog \
      # --reporters=Deadlock \
      # --validators=None \
      # --validators=None \
      # --mysqld=--log_output=none \
      # --mysqld=--log_bin_trust_function_creators=1 \
      # --mysqld=--loose-debug_assert_on_not_freed_memory=0 \
      # --engine=InnoDB \
      # --restart_timeout=240 \
      # --mysqld=--plugin-load-add=file_key_management.so \
      # --mysqld=--loose-file-key-management-filename=$RQG_HOME/conf/mariadb/encryption_keys.txt \
      # --mysqld=--plugin-load-add=provider_lzo.so \
      # --mysqld=--plugin-load-add=provider_bzip2.so \
      # --mysqld=--plugin-load-add=provider_lzma.so \
      # --mysqld=--plugin-load-add=provider_snappy.so \
      # --mysqld=--plugin-load-add=provider_lz4.so \
      # --mysqld=--loose-innodb_compression_level=1 \
      # --duration=300 \
      # --mysqld=--loose-innodb_fatal_semaphore_wait_threshold=300 \
      # --mysqld=--loose-innodb_read_only_compressed=OFF \
      # --mysqld=--loose-innodb-sync-debug \
      # --mysqld=--innodb_stats_persistent=off \
      # --mysqld=--innodb_adaptive_hash_index=off \
      # --mysqld=--innodb_random_read_ahead=ON \
      # --mysqld=--loose-innodb_evict_tables_on_commit_debug=off \
      # --mysqld=--loose-max-statement-time=30 \
      # --threads=1 \
      # --mysqld=--innodb_use_native_aio=1 \
      # --mysqld=--innodb_undo_log_truncate=ON \
      # --mysqld=--loose_innodb_change_buffering=none \
      # --mysqld=--innodb_undo_tablespaces=16 \
      # --mysqld=--innodb_rollback_on_timeout=ON \
      # --mysqld=--innodb_page_size=32K \
      # --mysqld=--innodb-buffer-pool-size=256M \
      # <local settings>
      
      

      Attachments

        1. MDEV-31393.zz
          1 kB
        2. MDEV-31393.yy
          0.4 kB
        3. MDEV-31393_Extreme.cfg
          47 kB

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              monty Michael Widenius
              mleich Matthias Leich
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                Updated:

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