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  1. MariaDB Server
  2. MDEV-25814

Server crashes in Query_cache::process_and_count_tables upon query with SQL_CACHE and function modifying data

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    Details

    • Type: Bug
    • Status: Open (View Workflow)
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 10.4, 10.5, 10.6
    • Fix Version/s: 10.4, 10.5
    • Component/s: Query Cache
    • Labels:
      None

      Description

      SET @qtype= @@global.query_cache_type;
      SET GLOBAL query_cache_type= ON;
      SET query_cache_type= ON;
       
      --delimiter $
      CREATE FUNCTION f() RETURNS INT
      BEGIN
        DELETE FROM x;
        RETURN 1;
      END $
      --delimiter ;
       
      CREATE TABLE t1 (a INT);
      SELECT SQL_CACHE f() FROM t1;
       
      # Cleanup
      DROP FUNCTION f;
      DROP TABLE t1;
      SET GLOBAL query_cache_type= @qtype;
      

      10.4 26f9ff0a

      #3  <signal handler called>
      #4  Query_cache::process_and_count_tables (this=0x561d4d4dcca0 <query_cache>, thd=0x7f18dc000d90, tables_used=0x7f18dc017628, tables_type=0x7f18ede2b613 "") at /data/src/10.4/sql/sql_cache.cc:4109
      #5  0x0000561d4bccc5af in Query_cache::is_cacheable (this=0x561d4d4dcca0 <query_cache>, thd=0x7f18dc000d90, lex=0x7f18dc004c10, tables_used=0x7f18dc016428, tables_type=0x7f18ede2b613 "") at /data/src/10.4/sql/sql_cache.cc:4165
      #6  0x0000561d4bcc4a7c in Query_cache::store_query (this=0x561d4d4dcca0 <query_cache>, thd=0x7f18dc000d90, tables_used=0x7f18dc016428) at /data/src/10.4/sql/sql_cache.cc:1408
      #7  0x0000561d4bd5b598 in execute_sqlcom_select (thd=0x7f18dc000d90, all_tables=0x7f18dc016428) at /data/src/10.4/sql/sql_parse.cc:6445
      #8  0x0000561d4bd51dca in mysql_execute_command (thd=0x7f18dc000d90) at /data/src/10.4/sql/sql_parse.cc:3965
      #9  0x0000561d4bd5f5eb in mysql_parse (thd=0x7f18dc000d90, rawbuf=0x7f18dc0147a8 "SELECT SQL_CACHE f() FROM t1", length=28, parser_state=0x7f18ede2c4d0, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:7992
      #10 0x0000561d4bd4b92b in dispatch_command (command=COM_QUERY, thd=0x7f18dc000d90, packet=0x7f18dc00ac01 "SELECT SQL_CACHE f() FROM t1", packet_length=28, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:1857
      #11 0x0000561d4bd4a191 in do_command (thd=0x7f18dc000d90) at /data/src/10.4/sql/sql_parse.cc:1373
      #12 0x0000561d4bedb218 in do_handle_one_connection (connect=0x561d4ef81f20) at /data/src/10.4/sql/sql_connect.cc:1412
      #13 0x0000561d4bedaf61 in handle_one_connection (arg=0x561d4ef81f20) at /data/src/10.4/sql/sql_connect.cc:1316
      #14 0x0000561d4c908e46 in pfs_spawn_thread (arg=0x561d4ef5ad20) at /data/src/10.4/storage/perfschema/pfs.cc:1869
      #15 0x00007f18f44c2609 in start_thread (arg=<optimized out>) at pthread_create.c:477
      #16 0x00007f18f4096293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      Fails the same way on 10.4-10.6 debug, release and ASAN builds.
      The failure was introduced in 10.4.0 by this commit:

      commit de745ecf29721795710910a19bd0ea3389da804c
      Author: Oleksandr Byelkin
      Date:   Tue May 22 19:08:39 2018 +0200
       
          MDEV-11953: support of brackets in UNION/EXCEPT/INTERSECT operations
      

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            Assignee:
            sanja Oleksandr Byelkin
            Reporter:
            elenst Elena Stepanova
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              Dates

              Created:
              Updated:

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