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  1. MariaDB Server
  2. MDEV-29962

SIGSEGV in ha_spider::lock_tables on BEGIN after table lock

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      Not a new regression. The crash is present in optimized builds only, debug builds seem to work fine.

      INSTALL PLUGIN Spider SONAME 'ha_spider.so';
      CREATE USER Spider@localhost IDENTIFIED BY '';
      CREATE SERVER srv FOREIGN DATA WRAPPER MYSQL OPTIONS (SOCKET '../socket.sock',DATABASE 'test',user 'Spider',PASSWORD '');
      CREATE TABLE t (c INT) ENGINE=InnoDB;
      CREATE TABLE t1 (c INT) ENGINE=Spider COMMENT='WRAPPER "mysql",srv "srv",TABLE "t"';
      SELECT * FROM t1;
      LOCK TABLES t1 WRITE CONCURRENT,t1 AS t2 READ;
      BEGIN;
      

      Leads to:

      10.11.1 50c5743adc87e1cdec1431a02558f6540fe5a6d5 (Optimized)

      Core was generated by `/test/MD221022-mariadb-10.11.1-linux-x86_64-opt/bin/mysqld --no-defaults --core'.
      Program terminated with signal SIGSEGV, Segmentation fault.
      #0  0x0000152d3d82cd4e in ha_spider::lock_tables (
          this=this@entry=0x152ccc04bb50)
          at /test/10.11_opt/storage/spider/ha_spider.cc:12184
      12184	        if (
      [Current thread is 1 (Thread 0x152d3d8d6700 (LWP 354245))]
      (gdb) bt
      #0  0x0000152d3d82cd4e in ha_spider::lock_tables (this=this@entry=0x152ccc04bb50) at /test/10.11_opt/storage/spider/ha_spider.cc:12184
      #1  0x0000152d3d82d200 in ha_spider::external_lock (this=0x152ccc04bb50, thd=<optimized out>, lock_type=2) at /test/10.11_opt/storage/spider/ha_spider.cc:921
      #2  0x000055aa825b5d78 in handler::ha_external_lock (this=0x152ccc04bb50, thd=thd@entry=0x152ccc000c58, lock_type=lock_type@entry=2) at /test/10.11_opt/sql/handler.cc:7095
      #3  0x000055aa826cb55c in handler::ha_external_unlock (thd=0x152ccc000c58, this=<optimized out>) at /test/10.11_opt/sql/handler.h:3538
      #4  unlock_external (count=<optimized out>, table=0x152ccc0813f8, thd=0x152ccc000c58) at /test/10.11_opt/sql/lock.cc:744
      #5  mysql_unlock_tables (thd=0x152ccc000c58, sql_lock=0x152ccc0813b8, free_lock=<optimized out>) at /test/10.11_opt/sql/lock.cc:435
      #6  0x000055aa826cbad8 in mysql_unlock_tables (thd=thd@entry=0x152ccc000c58, sql_lock=<optimized out>) at /test/10.11_opt/sql/lock.cc:418
      #7  0x000055aa822f2209 in close_thread_tables (thd=thd@entry=0x152ccc000c58) at /test/10.11_opt/sql/sql_base.cc:953
      #8  0x000055aa822f307b in Locked_tables_list::unlock_locked_tables (thd=0x152ccc000c58, this=0x152ccc004af8) at /test/10.11_opt/sql/sql_base.cc:2571
      #9  Locked_tables_list::unlock_locked_tables (this=this@entry=0x152ccc004af8, thd=thd@entry=0x152ccc000c58) at /test/10.11_opt/sql/sql_base.cc:2542
      #10 0x000055aa8248f28d in trans_begin (thd=thd@entry=0x152ccc000c58, flags=0) at /test/10.11_opt/sql/transaction.cc:115
      #11 0x000055aa8236a1ae in mysql_execute_command (thd=0x152ccc000c58, is_called_from_prepared_stmt=<optimized out>) at /test/10.11_opt/sql/sql_parse.cc:5605
      #12 0x000055aa82358335 in mysql_parse (rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>, thd=0x152ccc000c58) at /test/10.11_opt/sql/sql_parse.cc:8023
      #13 mysql_parse (thd=0x152ccc000c58, rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>) at /test/10.11_opt/sql/sql_parse.cc:7945
      #14 0x000055aa823640ea in dispatch_command (command=COM_QUERY, thd=0x152ccc000c58, packet=<optimized out>, packet_length=<optimized out>, blocking=<optimized out>) at /test/10.11_opt/sql/sql_class.h:1346
      #15 0x000055aa82365ee2 in do_command (thd=0x152ccc000c58, blocking=blocking@entry=true) at /test/10.11_opt/sql/sql_parse.cc:1407
      #16 0x000055aa8247ffbf in do_handle_one_connection (connect=<optimized out>, connect@entry=0x55aa8599ac18, put_in_cache=put_in_cache@entry=true) at /test/10.11_opt/sql/sql_connect.cc:1416
      #17 0x000055aa8248029d in handle_one_connection (arg=0x55aa8599ac18) at /test/10.11_opt/sql/sql_connect.cc:1318
      #18 0x0000152d63b56609 in start_thread (arg=<optimized out>) at pthread_create.c:477
      #19 0x0000152d63742133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      Bug confirmed present in:
      MariaDB: 10.5.18 (opt), 10.6.10 (opt), 10.7.6 (opt), 10.8.5 (opt), 10.9.3 (opt), 10.10.2 (opt), 10.11.1 (opt)

      Bug (or feature/syntax) confirmed not present in:
      MariaDB: 10.3.37 (dbg), 10.3.37 (opt), 10.4.27 (dbg), 10.4.27 (opt), 10.5.18 (dbg), 10.6.10 (dbg), 10.7.6 (dbg), 10.8.5 (dbg), 10.9.3 (dbg), 10.10.2 (dbg), 10.11.1 (dbg)
      MySQL: 5.5.62 (dbg), 5.5.62 (opt), 5.6.51 (dbg), 5.6.51 (opt), 5.7.38 (dbg), 5.7.38 (opt), 8.0.29 (dbg), 8.0.29 (opt)

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              Assignee:
              nayuta-yanagisawa Nayuta Yanagisawa (Inactive)
              Reporter:
              Roel Roel Van de Paar
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                Dates

                Created:
                Updated:

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