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  1. MDEV-5582

Plugin 'MEMORY' has ref_count=1 after shutdown with materialization+semijoin

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 5.3.12, 5.5.35, 10.0.7
    • Fix Version/s: 5.5.36, 10.0.9, 5.3.13
    • Component/s: None
    • Labels:
      None

      Description

      SET optimizer_switch = 'materialization=on,semijoin=on';
      
      CREATE TABLE t1 (a INT);
      INSERT INTO t1 VALUES (8),(9);
      
      CREATE TABLE t2 (b INT);
      INSERT INTO t2 VALUES (2),(3);
      
      CREATE TABLE t3 (c INT, INDEX(c));
      INSERT INTO t2 VALUES (4),(5);
      
      SELECT * FROM t1 WHERE 9 IN ( SELECT b FROM t2 WHERE 1 IN ( SELECT MIN(c) FROM t3 ) );
      

      In 5.3 and 5.5, it produces the error on shutdown:

      140128 19:10:55 [Warning] Plugin 'MEMORY' will be forced to shutdown
      140128 19:10:55 [ERROR] Plugin 'MEMORY' has ref_count=1 after shutdown.
      

      In 10.0, it causes assertion failure:

      sql/sql_class.cc:1634: virtual THD::~THD(): Assertion `status_var.memory_used == 0' failed.
      140128 19:13:28 [ERROR] mysqld got signal 6 ;
      
      #6  0x00007f4e893ea621 in *__GI___assert_fail (assertion=0xfd028f "status_var.memory_used == 0", file=<optimized out>, line=1634, function=0xfd2850 "virtual THD::~THD()") at assert.c:81
      #7  0x00000000006295a2 in THD::~THD (this=0x7f4e8333d070, __in_chrg=<optimized out>) at 10.0/sql/sql_class.cc:1634
      #8  0x000000000062972a in THD::~THD (this=0x7f4e8333d070, __in_chrg=<optimized out>) at 10.0/sql/sql_class.cc:1639
      #9  0x00000000005ab8f2 in unlink_thd (thd=0x7f4e8333d070) at 10.0/sql/mysqld.cc:2715
      #10 0x00000000005abc52 in one_thread_per_connection_end (thd=0x7f4e8333d070, put_in_cache=true) at 10.0/sql/mysqld.cc:2826
      #11 0x000000000077a563 in do_handle_one_connection (thd_arg=0x7f4e8333d070) at 10.0/sql/sql_connect.cc:1390
      #12 0x000000000077a210 in handle_one_connection (arg=0x7f4e8333d070) at 10.0/sql/sql_connect.cc:1293
      #13 0x0000000000a9d1f1 in pfs_spawn_thread (arg=0x7f4e83b75df0) at 10.0/storage/perfschema/pfs.cc:1853
      #14 0x00007f4e8a94ab50 in start_thread (arg=<optimized out>) at pthread_create.c:304
      #15 0x00007f4e89499a7d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
      

      Stack trace from:

      revision-id: psergey@askmonty.org-20140121100700-9g8hl8vx8nmk1e2w
      revno: 3965
      branch-nick: 10.0
      

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            • Assignee:
              psergey Sergei Petrunia
              Reporter:
              elenst Elena Stepanova
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              Dates

              • Created:
                Updated:
                Resolved: