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  1. MariaDB Server
  2. MDEV-28739

Trying to lock uninitialized mutex or hang upon shutdown after using Spider with query_cache

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      --source plugin/spider/spider/include/init_spider.inc
       
      set global query_cache_type= on;
      set spider_same_server_link = on;
       
      eval create server s foreign data wrapper mysql options (host "127.0.0.1", database "test", user "root", port $MASTER_MYPORT);
      CREATE TABLE t (a INT);
      CREATE TABLE t_SPIDER (a INT) ENGINE=SPIDER COMMENT="wrapper 'mysql', srv 's', table 't'";
      SELECT * FROM t_SPIDER;
       
      --source include/restart_mysqld.inc
       
      DROP TABLE t_SPIDER;
      DROP TABLE t;
       
      --source plugin/spider/spider/include/deinit_spider.inc
      

      10.3 91d5fffa

      2022-06-03  1:50:08 0 [Note] Event Scheduler: Purging the queue. 0 events
      safe_mutex: Trying to lock uninitialized mutex at /data/src/10.3/sql/sql_cache.cc, line 723
      220603  1:50:08 [ERROR] mysqld got signal 6 ;
       
      #3  <signal handler called>
      #4  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
      #5  0x00007faa86c1e537 in __GI_abort () at abort.c:79
      #6  0x000055f9a2c5e92c in safe_mutex_lock (mp=0x55f9a36ee2c0 <query_cache+160>, my_flags=0, file=0x55f9a2ce7ea8 "/data/src/10.3/sql/sql_cache.cc", line=723) at /data/src/10.3/mysys/thr_mutex.c:248
      #7  0x000055f9a2040152 in inline_mysql_mutex_lock (that=0x55f9a36ee2c0 <query_cache+160>, src_file=0x55f9a2ce7ea8 "/data/src/10.3/sql/sql_cache.cc", src_line=723) at /data/src/10.3/include/mysql/psi/mysql_thread.h:717
      #8  0x000055f9a20411f8 in Query_cache::lock (this=0x55f9a36ee220 <query_cache>, thd=0x7faa0c001fe0) at /data/src/10.3/sql/sql_cache.cc:723
      #9  0x000055f9a20480d9 in Query_cache::invalidate_table (this=0x55f9a36ee220 <query_cache>, thd=0x7faa0c001fe0, key=0x7faa829062b0 "mysql", key_length=23) at /data/src/10.3/sql/sql_cache.cc:3312
      #10 0x000055f9a2045cf5 in Query_cache::invalidate_by_MyISAM_filename (this=0x55f9a36ee220 <query_cache>, filename=0x7faa0c00c4b8 "./mysql/spider_table_sts") at /data/src/10.3/sql/sql_cache.cc:2432
      #11 0x000055f9a2042629 in query_cache_invalidate_by_MyISAM_filename (filename=0x7faa0c00c4b8 "./mysql/spider_table_sts") at /data/src/10.3/sql/sql_cache.cc:1249
      #12 0x000055f9a2b6da25 in mi_update_status (param=0x7faa0c0090b0) at /data/src/10.3/storage/myisam/mi_locking.c:338
      #13 0x000055f9a2b6db74 in mi_update_status_with_lock (info=0x7faa0c0090b0) at /data/src/10.3/storage/myisam/mi_locking.c:374
      #14 0x000055f9a2b6cc96 in mi_lock_database (info=0x7faa0c0090b0, lock_type=2) at /data/src/10.3/storage/myisam/mi_locking.c:70
      #15 0x000055f9a2b46dac in ha_myisam::external_lock (this=0x7faa0c030f68, thd=0x7faa0c001fe0, lock_type=2) at /data/src/10.3/storage/myisam/ha_myisam.cc:2106
      #16 0x000055f9a23f5859 in handler::ha_external_lock (this=0x7faa0c030f68, thd=0x7faa0c001fe0, lock_type=2) at /data/src/10.3/sql/handler.cc:6418
      #17 0x000055f9a2520301 in unlock_external (thd=0x7faa0c001fe0, table=0x55f9a5af56b8, count=1) at /data/src/10.3/sql/lock.cc:708
      #18 0x000055f9a251f708 in mysql_unlock_tables (thd=0x7faa0c001fe0, sql_lock=0x55f9a5af5688, free_lock=false) at /data/src/10.3/sql/lock.cc:429
      #19 0x000055f9a251f65f in mysql_unlock_tables (thd=0x7faa0c001fe0, sql_lock=0x55f9a5af5688) at /data/src/10.3/sql/lock.cc:413
      #20 0x000055f9a20270b3 in close_thread_tables (thd=0x7faa0c001fe0) at /data/src/10.3/sql/sql_base.cc:863
      #21 0x00007faa80a71ebe in spider_sys_close_table (thd=0x7faa0c001fe0, open_tables_backup=0x7faa82906910) at /data/src/10.3/storage/spider/spd_sys_table.cc:407
      #22 0x00007faa80a71c51 in spider_close_sys_table (thd=0x7faa0c001fe0, table=0x7faa0c02fea0, open_tables_backup=0x7faa82906910, need_lock=false) at /data/src/10.3/storage/spider/spd_sys_table.cc:352
      #23 0x00007faa80a7ce98 in spider_sys_insert_or_update_table_sts (thd=0x7faa0c001fe0, name=0x7faa70191728 "./test/t_SPIDER", name_length=15, data_file_length=0x7faa700c4cf0, max_data_file_length=0x7faa700c4cf8, index_file_length=0x7faa700c4d00, records=0x7faa700c4d08, mean_rec_length=0x7faa700c4d10, check_time=0x7faa700c4d18, create_time=0x7faa700c4d20, update_time=0x7faa700c4d28, need_lock=false) at /data/src/10.3/storage/spider/spd_sys_table.cc:2950
      #24 0x00007faa80af5142 in spider_free_share (share=0x7faa700c3b40) at /data/src/10.3/storage/spider/spd_table.cc:5779
      #25 0x00007faa80b2b055 in ha_spider::close (this=0x7faa700c1e48) at /data/src/10.3/storage/spider/ha_spider.cc:815
      #26 0x000055f9a23eacea in handler::ha_close (this=0x7faa700c1e48) at /data/src/10.3/sql/handler.cc:2844
      #27 0x000055f9a21e76ab in closefrm (table=0x7faa700c11e0) at /data/src/10.3/sql/table.cc:3790
      #28 0x000055f9a230a044 in intern_close_table (table=0x7faa700c11e0) at /data/src/10.3/sql/table_cache.cc:222
      #29 0x000055f9a230a4b2 in tc_purge (mark_flushed=true) at /data/src/10.3/sql/table_cache.cc:335
      #30 0x000055f9a2025f26 in close_cached_tables (thd=0x0, tables=0x0, wait_for_refresh=false, timeout=31536000) at /data/src/10.3/sql/sql_base.cc:377
      #31 0x000055f9a230bbe0 in tdc_start_shutdown () at /data/src/10.3/sql/table_cache.cc:660
      #32 0x000055f9a1f8d188 in clean_up (print_message=true) at /data/src/10.3/sql/mysqld.cc:2241
      #33 0x000055f9a1f8cdb0 in unireg_end () at /data/src/10.3/sql/mysqld.cc:2116
      #34 0x000055f9a1f8ccae in kill_server (sig_ptr=0x0) at /data/src/10.3/sql/mysqld.cc:2043
      #35 0x000055f9a1f8ccec in kill_server_thread (arg=0x7faa80ceade0) at /data/src/10.3/sql/mysqld.cc:2066
      #36 0x000055f9a2be854a in pfs_spawn_thread (arg=0x55f9a5c19850) at /data/src/10.3/storage/perfschema/pfs.cc:1869
      #37 0x00007faa86dc6ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
      #38 0x00007faa86cf6def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      Reproducible on 10.3, 10.5+. On some reason couldn't reproduce on 10.4.
      Non-debug builds sometimes hang.

      The problem is particularly non-artificial for 10.3, because Debian installation of 10.3 includes a config file with query cache enabled.

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            Assignee:
            nayuta-yanagisawa Nayuta Yanagisawa
            Reporter:
            elenst Elena Stepanova
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              Updated:

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