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  1. MariaDB Server
  2. MDEV-27039

Trying to lock mutex ... when the mutex was already locked | SIGABRT in safe_mutex_lock | Hangs

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      Description

      Very similar to MDEV-25890 but different versions and different area. Almost definitely related. This testcase too causes mysqld hangs and likely (though not confirmed) cross-mysqld interaction (i.e. one mysqld affecting another, without anything shared). Testcase is sporadic, though usually only 1-2 executions are needed.

      # mysqld options required for replay: --log-bin --performance-schema
      INSTALL PLUGIN spider SONAME 'ha_spider.so';
      SET GLOBAL expire_logs_days=11;
      SET GLOBAL binlog_checksum=NONE;
      

      Leads to:

      10.8.0 bc57ff7cf79504a198d4752b4748340a4afd886c (Debug)

      2021-11-13 14:21:40 0 [Note] /test/MD121121-mariadb-10.8.0-linux-x86_64-dbg/bin/mysqld: ready for connections.
      Version: '10.8.0-MariaDB-debug-log'  socket: '/test/MD121121-mariadb-10.8.0-linux-x86_64-dbg/socket.sock'  port: 37855  MariaDB Server
      safe_mutex: Trying to lock mutex at /test/10.8_dbg/sql/sql_plugin.cc, line 3093, when the mutex was already locked at /test/10.8_dbg/sql/sys_vars_shared.h, line 56 in thread T@47
      

      10.8.0 bc57ff7cf79504a198d4752b4748340a4afd886c (Debug)

      Core was generated by `/test/MD121121-mariadb-10.8.0-linux-x86_64-dbg/bin/mysqld --no-defaults --core-'.
      Program terminated with signal SIGABRT, Aborted.
      #0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
      [Current thread is 1 (Thread 0x154df8bed700 (LWP 1629659))]
      (gdb) bt
      #0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
      #1  0x0000154e130d3859 in __GI_abort () at abort.c:79
      #2  0x00005603c8c83268 in safe_mutex_lock (mp=mp@entry=0x5603c9795b00 <LOCK_global_system_variables>, my_flags=my_flags@entry=0, file=file@entry=0x5603c8e31318 "/test/10.8_dbg/sql/sql_plugin.cc", line=line@entry=3093) at /test/10.8_dbg/mysys/thr_mutex.c:262
      #3  0x00005603c8c7d770 in psi_mutex_lock (that=0x5603c9795b00 <LOCK_global_system_variables>, file=file@entry=0x5603c8e31318 "/test/10.8_dbg/sql/sql_plugin.cc", line=line@entry=3093) at /test/10.8_dbg/mysys/my_thr_init.c:487
      #4  0x00005603c817f81c in inline_mysql_mutex_lock (src_line=3093, src_file=0x5603c8e31318 "/test/10.8_dbg/sql/sql_plugin.cc", that=<optimized out>) at /test/10.8_dbg/include/mysql/psi/mysql_thread.h:746
      #5  sync_dynamic_session_variables (thd=thd@entry=0x154dc0000db8, global_lock=global_lock@entry=true) at /test/10.8_dbg/sql/sql_plugin.cc:3093
      #6  0x00005603c817fa9a in intern_sys_var_ptr (thd=0x154dc0000db8, offset=160, global_lock=global_lock@entry=true) at /test/10.8_dbg/sql/sql_plugin.cc:3160
      #7  0x00005603c817fb8a in mysql_sys_var_int (thd=<optimized out>, offset=<optimized out>) at /test/10.8_dbg/sql/sql_plugin.cc:3182
      #8  0x0000154de91d59bf in spider_param_init_sql_alloc_size (thd=0x154dc0000db8, init_sql_alloc_size=0) at /test/10.8_dbg/storage/spider/spd_param.cc:600
      #9  0x0000154de92a0b01 in spider_mbase_handler::init (this=0x154dc005d950) at /test/10.8_dbg/storage/spider/spd_db_mysql.cc:8993
      #10 0x0000154de91edf2e in spider_get_trx (thd=thd@entry=0x154dc0000db8, regist_allocated_thds=regist_allocated_thds@entry=true, error_num=error_num@entry=0x154df8bebb1c) at /test/10.8_dbg/storage/spider/spd_trx.cc:1518
      #11 0x0000154de9248946 in spider_flush_logs (hton=<optimized out>) at /test/10.8_dbg/storage/spider/spd_table.cc:7040
      #12 0x00005603c845bf88 in flush_handlerton (thd=thd@entry=0x0, plugin=<optimized out>, arg=arg@entry=0x0) at /test/10.8_dbg/sql/handler.cc:3011
      #13 0x00005603c8180ab0 in plugin_foreach_with_mask (thd=thd@entry=0x0, func=func@entry=0x5603c845bf66 <flush_handlerton(THD*, plugin_ref, void*)>, type=type@entry=1, state_mask=state_mask@entry=8, arg=arg@entry=0x0) at /test/10.8_dbg/sql/sql_plugin.cc:2509
      #14 0x00005603c8463419 in ha_flush_logs () at /test/10.8_dbg/sql/handler.cc:3017
      #15 0x00005603c85ca5e8 in MYSQL_BIN_LOG::purge (this=this@entry=0x5603c97ca160 <mysql_bin_log>) at /test/10.8_dbg/sql/log.cc:7031
      #16 0x00005603c85cf2f9 in MYSQL_BIN_LOG::checkpoint_and_purge (this=this@entry=0x5603c97ca160 <mysql_bin_log>, binlog_id=binlog_id@entry=1) at /test/10.8_dbg/sql/log.cc:7043
      #17 0x00005603c85da247 in binlog_checksum_update (thd=<optimized out>, var=<optimized out>, var_ptr=<optimized out>, save=<optimized out>) at /test/10.8_dbg/sql/log.cc:11570
      #18 0x00005603c8181bf1 in sys_var_pluginvar::global_update (this=0x5603cbead8b0, thd=0x154dc0000db8, var=0x154dc0014308) at /test/10.8_dbg/sql/sql_plugin.cc:3621
      #19 0x00005603c805b6ae in sys_var::update (this=0x5603cbead8b0, thd=0x154dc0000db8, var=0x154dc0014308) at /test/10.8_dbg/sql/set_var.cc:207
      #20 0x00005603c805bbdb in set_var::update (this=<optimized out>, thd=<optimized out>) at /test/10.8_dbg/sql/set_var.cc:863
      #21 0x00005603c805cf21 in sql_set_variables (thd=thd@entry=0x154dc0000db8, var_list=var_list@entry=0x154dc00060d8, free=free@entry=true) at /test/10.8_dbg/sql/set_var.cc:745
      #22 0x00005603c81638f4 in mysql_execute_command (thd=thd@entry=0x154dc0000db8, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /test/10.8_dbg/sql/sql_parse.cc:5034
      #23 0x00005603c814ccad in mysql_parse (thd=thd@entry=0x154dc0000db8, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x154df8bec400) at /test/10.8_dbg/sql/sql_parse.cc:8028
      #24 0x00005603c815b949 in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x154dc0000db8, packet=packet@entry=0x154dc001a239 "SET GLOBAL binlog_checksum=NONE", packet_length=packet_length@entry=31, blocking=blocking@entry=true) at /test/10.8_dbg/sql/sql_class.h:1360
      #25 0x00005603c815ed83 in do_command (thd=0x154dc0000db8, blocking=blocking@entry=true) at /test/10.8_dbg/sql/sql_parse.cc:1402
      #26 0x00005603c82d8e2a in do_handle_one_connection (connect=<optimized out>, connect@entry=0x5603cc5ccba8, put_in_cache=put_in_cache@entry=true) at /test/10.8_dbg/sql/sql_connect.cc:1418
      #27 0x00005603c82d942f in handle_one_connection (arg=arg@entry=0x5603cc5ccba8) at /test/10.8_dbg/sql/sql_connect.cc:1312
      #28 0x00005603c87594ce in pfs_spawn_thread (arg=0x5603cc4c3b88) at /test/10.8_dbg/storage/perfschema/pfs.cc:2201
      #29 0x0000154e135e2609 in start_thread (arg=<optimized out>) at pthread_create.c:477
      #30 0x0000154e131d0293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      Bug confirmed present in:
      MariaDB: 10.6.6 (dbg), 10.7.2 (dbg), 10.8.0 (dbg)

      Bug (or feature/syntax) confirmed not present in (unless sporadicity caused it not to crash/fail):
      MariaDB: 10.2.42 (dbg), 10.2.42 (opt), 10.3.33 (dbg), 10.3.33 (opt), 10.4.23 (dbg), 10.4.23 (opt), 10.5.14 (dbg), 10.5.14 (opt), 10.6.6 (opt), 10.7.2 (opt), 10.8.0 (opt)
      MySQL: 5.5.62 (dbg), 5.5.62 (opt), 5.6.51 (dbg), 5.6.51 (opt), 5.7.36 (dbg), 5.7.36 (opt), 8.0.27 (dbg), 8.0.27 (opt)

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              Assignee:
              Elkin Andrei Elkin
              Reporter:
              Roel Roel Van de Paar
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                Created:
                Updated:
                Resolved:

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