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  1. MariaDB Server
  2. MDEV-30012

Triple thread hang in states 'NULL', 'NULL' and 'closing tables' on INSERT

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      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 (c1 INT) ENGINE=Spider COMMENT='WRAPPER "mysql",srv "srv",TABLE "t"';
      SELECT CONCAT ('FROM JSON subSELECT ',c,' AS CHAR(1))'),CAST((SELECT 1 FROM t) AS CHAR(1)) FROM t WHERE c='NULL';
      CREATE TABLE t1 (c1 INT) ENGINE=Spider COMMENT='WRAPPER "mysql",srv "srv",TABLE "t"';
      INSERT INTO t1 VALUES (0);
      

      Leads to a triple thread hang in states 'NULL', 'NULL' and 'closing tables'

      10.11.1 50c5743adc87e1cdec1431a02558f6540fe5a6d5 (Debug)

      10.11.1-dbg>SHOW PROCESSLIST;
      +----+-------------+-----------+------+---------+------+----------------------------------------------------+----------------------------------------+----------+
      | Id | User        | Host      | db   | Command | Time | State                                              | Info                                   | Progress |
      +----+-------------+-----------+------+---------+------+----------------------------------------------------+----------------------------------------+----------+
      |  4 | root        | localhost | test | Query   |  100 | closing tables                                     | INSERT INTO t1 VALUES (0)              |    0.000 |
      |  5 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                   |    0.000 |
      |  6 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                   |    0.000 |
      |  7 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                   |    0.000 |
      |  8 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                   |    0.000 |
      |  9 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                   |    0.000 |
      | 10 | system user |           | NULL | Sleep   |  100 | Reset for next command                             | NULL                                   |    0.000 |
      | 11 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                   |    0.000 |
      | 12 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                   |    0.000 |
      | 13 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                   |    0.000 |
      | 14 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                   |    0.000 |
      | 15 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                   |    0.000 |
      | 16 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                   |    0.000 |
      | 17 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                   |    0.000 |
      | 19 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                   |    0.000 |
      | 20 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                   |    0.000 |
      | 18 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                   |    0.000 |
      | 21 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                   |    0.000 |
      | 22 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                   |    0.000 |
      | 23 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                   |    0.000 |
      | 24 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                   |    0.000 |
      | 26 | Spider      | localhost | test | Query   |  100 | NULL                                               | show table status from `test` like 't' |    0.000 |
      | 27 | Spider      | localhost | test | Query   |  100 | NULL                                               | show table status from `test` like 't' |    0.000 |
      | 28 | root        | localhost | test | Query   |    0 | starting                                           | SHOW PROCESSLIST                       |    0.000 |
      +----+-------------+-----------+------+---------+------+----------------------------------------------------+----------------------------------------+----------+
      24 rows in set (0.000 sec)
      

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

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