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  1. MariaDB Server
  2. MDEV-27404

SIGSEGV in rbt_free_node, hang in 'closing tables' state on DROP TABLE

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      Description

      Sporadic issue, SIGSEGV requires about 5 to 20 executions, hang potentially more (less than 1000). SIGSEGV happens on optimized and debug builds. The hangs may be limited to debug builds only, though it is difficult to say as optimized builds hit the SIGSEGV first/earlier. Issue seems SPIDER triggered, but stack is InnoDB. DROP/CREATE/USE test (and INSTALL PLUGIN) are only there to ensure a clean state on loop, not required otherwise.

      DROP DATABASE test;
      CREATE DATABASE test;
      USE test;
      INSTALL PLUGIN spider SONAME 'ha_spider.so';
      CREATE TABLE t1 (f VARBINARY(1)) ENGINE=SPIDER;
      CREATE TABLE t2 (c INT KEY,c2 INT) ENGINE=SPIDER;
      INSERT INTO t2 VALUES (0);
      ALTER TABLE t1 CHANGE COLUMN a a INT;
      ALTER TABLE t2 CHANGE COLUMN a a INT;
      INSERT INTO t1 VALUES (0);
      SELECT (SELECT * FROM t2) AS c FROM t2;
      ALTER TABLE t2 CHANGE COLUMN a a INT;
      CREATE TABLE t3 (a CHAR(1),FULLTEXT (a)) ENGINE=InnoDB;
      INSERT INTO t2 VALUES (0);
      DROP TABLE t3;
      

      Leads to:

      10.8.0 ccdf5711a8fff0cd610a91fdcf37c8ff1182878c (Optimized)

      Core was generated by `/test/MD121221-mariadb-10.8.0-linux-x86_64-opt/bin/mysqld --no-defaults --core-'.
      Program terminated with signal SIGSEGV, Segmentation fault.
      #0  0x0000557c430ae382 in rbt_free_node (node=0x0, nil=0x150f8c0bc738)
          at /test/10.8_opt/storage/innobase/ut/ut0rbt.cc:731
      731			rbt_free_node(node->left, nil);
      [Current thread is 1 (Thread 0x151040477700 (LWP 3396074))]
      (gdb) bt
      #0  0x0000557c430ae382 in rbt_free_node (node=0x0, nil=0x150f8c0bc738) at /test/10.8_opt/storage/innobase/ut/ut0rbt.cc:731
      #1  0x0000557c430af822 in rbt_free_node (nil=0x150f8c0bc738, node=0x150f8c0bc700) at /test/10.8_opt/storage/innobase/ut/ut0rbt.cc:731
      #2  rbt_free_node (nil=0x150f8c0bc738, node=<optimized out>) at /test/10.8_opt/storage/innobase/ut/ut0rbt.cc:732
      #3  rbt_free_node (nil=0x150f8c0bc738, node=<optimized out>) at /test/10.8_opt/storage/innobase/ut/ut0rbt.cc:732
      #4  rbt_free_node (nil=0x150f8c0bc738, node=<optimized out>) at /test/10.8_opt/storage/innobase/ut/ut0rbt.cc:732
      #5  rbt_free_node (nil=0x150f8c0bc738, node=0x150f8c0bdcb8) at /test/10.8_opt/storage/innobase/ut/ut0rbt.cc:731
      #6  rbt_free_node (nil=0x150f8c0bc738, node=0x150f8c0bc788) at /test/10.8_opt/storage/innobase/ut/ut0rbt.cc:731
      #7  rbt_free (tree=0x150f8c0bd4d8) at /test/10.8_opt/storage/innobase/ut/ut0rbt.cc:745
      #8  0x0000557c4314e634 in fts_cache_destroy (cache=0x150f8c09be80) at /test/10.8_opt/storage/innobase/fts/fts0fts.cc:289
      #9  0x0000557c43152132 in fts_t::~fts_t (this=0x150f8c032eb0, __in_chrg=<optimized out>) at /test/10.8_opt/storage/innobase/fts/fts0fts.cc:5198
      #10 fts_free (table=table@entry=0x150f8c03f9f0) at /test/10.8_opt/storage/innobase/fts/fts0fts.cc:5235
      #11 0x0000557c4310a4fc in dict_sys_t::remove (this=0x557c43b42440 <dict_sys>, table=table@entry=0x150f8c03f9f0, lru=lru@entry=false, keep=keep@entry=false) at /test/10.8_opt/storage/innobase/dict/dict0dict.cc:1898
      #12 0x0000557c43128256 in trx_t::commit (this=this@entry=0x151041510230, deleted=std::vector of length 1, capacity 1 = {{m_file = 60, m_psi = 0x0}}) at /test/10.8_opt/storage/innobase/dict/drop.cc:249
      #13 0x0000557c42f9f74c in ha_innobase::delete_table (this=<optimized out>, name=<optimized out>) at /test/10.8_opt/storage/innobase/handler/ha_innodb.cc:13610
      #14 0x0000557c42ca5745 in hton_drop_table (hton=<optimized out>, path=<optimized out>) at /test/10.8_opt/sql/handler.cc:576
      #15 0x0000557c42cabf1c in ha_delete_table (thd=thd@entry=0x150f8c000c58, hton=hton@entry=0x557c44b39b58, path=path@entry=0x1510404759c0 "./test/t3", db=db@entry=0x1510404757b0, alias=alias@entry=0x1510404757c0, generate_warning=generate_warning@entry=true) at /test/10.8_opt/sql/handler.cc:3097
      #16 0x0000557c42b01f16 in mysql_rm_table_no_locks (thd=0x150f8c000c58, tables=<optimized out>, current_db=<optimized out>, ddl_log_state=<optimized out>, if_exists=<optimized out>, drop_temporary=<optimized out>, drop_view=<optimized out>, drop_sequence=<optimized out>, dont_log_query=<optimized out>, dont_free_locks=<optimized out>) at /test/10.8_opt/sql/sql_table.cc:1572
      #17 0x0000557c42b0355e in mysql_rm_table (thd=thd@entry=0x150f8c000c58, tables=tables@entry=0x150f8c010960, if_exists=<optimized out>, drop_temporary=<optimized out>, drop_sequence=<optimized out>, dont_log_query=dont_log_query@entry=false) at /test/10.8_opt/sql/sql_table.cc:1147
      #18 0x0000557c42a60289 in mysql_execute_command (thd=0x150f8c000c58, is_called_from_prepared_stmt=<optimized out>) at /test/10.8_opt/sql/structs.h:568
      #19 0x0000557c42a4f986 in mysql_parse (thd=0x150f8c000c58, rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>) at /test/10.8_opt/sql/sql_parse.cc:8028
      #20 0x0000557c42a5bb35 in dispatch_command (command=COM_QUERY, thd=0x150f8c000c58, packet=<optimized out>, packet_length=<optimized out>, blocking=<optimized out>) at /test/10.8_opt/sql/sql_class.h:1360
      #21 0x0000557c42a5dd27 in do_command (thd=0x150f8c000c58, blocking=blocking@entry=true) at /test/10.8_opt/sql/sql_parse.cc:1402
      #22 0x0000557c42b7c2e7 in do_handle_one_connection (connect=<optimized out>, put_in_cache=true) at /test/10.8_opt/sql/sql_connect.cc:1418
      #23 0x0000557c42b7c62d in handle_one_connection (arg=arg@entry=0x557c45030a58) at /test/10.8_opt/sql/sql_connect.cc:1312
      #24 0x0000557c42eea5d8 in pfs_spawn_thread (arg=0x557c44fe81f8) at /test/10.8_opt/storage/perfschema/pfs.cc:2201
      #25 0x0000151044309609 in start_thread (arg=<optimized out>) at pthread_create.c:477
      #26 0x0000151043ef7293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      10.8.0 ccdf5711a8fff0cd610a91fdcf37c8ff1182878c (Debug)

      MariaDB [test]> show processlist;
      +----+-------------+-----------+------+---------+------+----------------------------------------------------+------------------+----------+
      | Id | User        | Host      | db   | Command | Time | State                                              | Info             | Progress |
      +----+-------------+-----------+------+---------+------+----------------------------------------------------+------------------+----------+
      |  4 | root        | localhost | test | Query   |  724 | closing tables                                     | DROP TABLE t3    |    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 cardinality action handler | NULL             |    0.000 |
      |  8 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL             |    0.000 |
      | 11 | 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 statistics action handler  | NULL             |    0.000 |
      | 15 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL             |    0.000 |
      | 17 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL             |    0.000 |
      | 18 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL             |    0.000 |
      | 19 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL             |    0.000 |
      | 20 | system user |           | NULL | Sleep   |  740 | Reset for next command                             | NULL             |    0.000 |
      | 16 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL             |    0.000 |
      | 12 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL             |    0.000 |
      |  9 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL             |    0.000 |
      | 23 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL             |    0.000 |
      | 22 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL             |    0.000 |
      | 10 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL             |    0.000 |
      | 21 | 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 | root        | localhost | test | Query   |    0 | starting                                           | show processlist |    0.000 |
      +----+-------------+-----------+------+---------+------+----------------------------------------------------+------------------+----------+
      22 rows in set (0.000 sec)
      

      Bug confirmed present in:
      MariaDB: 10.5.14 (dbg), 10.5.14 (opt), 10.6.6 (dbg), 10.6.6 (opt), 10.7.2 (dbg), 10.7.2 (opt), 10.8.0 (dbg), 10.8.0 (opt)

      Bug (or feature/syntax) confirmed not present in:
      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)
      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:
              thiru Thirunarayanan Balathandayuthapani
              Reporter:
              Roel Roel Van de Paar
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                Created:
                Updated:
                Resolved:

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