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  1. MariaDB Server
  2. MDEV-22033

Server crashes in negate_expression upon meaningless GET DIAGNOSTICS

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    Details

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

      Description

      Despite it causing a non-debug server crash, the query is so meaningless that I cannot set it to Major.

      GET DIAGNOSTICS CONDITION @a := NOT 1 NOT IN ( SELECT 1 );
      

      10.4 f7599f47

      #3  <signal handler called>
      #4  0x000055ca66ce0360 in negate_expression (thd=0x7facf8000af0, expr=0x7facf80143e0) at /data/src/10.4/sql/sql_parse.cc:9840
      #5  0x000055ca66f7c21b in MYSQLparse (thd=0x7facf8000af0) at /data/src/10.4/sql/sql_yacc.yy:9945
      #6  0x000055ca66ce103a in parse_sql (thd=0x7facf8000af0, parser_state=0x7fad0a6f6160, creation_ctx=0x0, do_pfs_digest=true) at /data/src/10.4/sql/sql_parse.cc:10206
      #7  0x000055ca66cdb85e in mysql_parse (thd=0x7facf8000af0, rawbuf=0x7facf80132f0 "GET DIAGNOSTICS CONDITION @a := NOT 1 NOT IN ( SELECT 1 )", length=57, parser_state=0x7fad0a6f6160, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:7853
      #8  0x000055ca66cc6bd0 in dispatch_command (command=COM_QUERY, thd=0x7facf8000af0, packet=0x7facf8136171 "GET DIAGNOSTICS CONDITION @a := NOT 1 NOT IN ( SELECT 1 )", packet_length=57, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:1842
      #9  0x000055ca66cc525d in do_command (thd=0x7facf8000af0) at /data/src/10.4/sql/sql_parse.cc:1360
      #10 0x000055ca66e4e70f in do_handle_one_connection (connect=0x55ca698ff4d0) at /data/src/10.4/sql/sql_connect.cc:1412
      #11 0x000055ca66e4e45e in handle_one_connection (arg=0x55ca698ff4d0) at /data/src/10.4/sql/sql_connect.cc:1316
      #12 0x000055ca67856db3 in pfs_spawn_thread (arg=0x55ca69813460) at /data/src/10.4/storage/perfschema/pfs.cc:1869
      #13 0x00007fad124d54a4 in start_thread (arg=0x7fad0a6f7700) at pthread_create.c:456
      #14 0x00007fad10609d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
      

      Reproducible on 10.4-10.5, debug, non-debug and ASAN alike.
      Not reproducible on 10.3.

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            Assignee:
            bar Alexander Barkov
            Reporter:
            elenst Elena Stepanova
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              Dates

              Created:
              Updated:

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