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  1. MariaDB Server
  2. MDEV-5060

Server crashes on EXPLAIN EXTENDED or EXPLAIN PARTITIONS with explain in slow_log

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 10.0.5
    • Component/s: None
    • Labels:
      None

      Description

      SET log_slow_verbosity='query_plan,explain';
      SET GLOBAL slow_query_log=1;
      SET long_query_time=0.000001;
       
      EXPLAIN PARTITIONS SELECT 1 ;

      #3  <signal handler called>
      #4  0x00000000006bd1ab in String::append (this=0x7fbefdd0fd70, s=0xa5a5a5a5a5a5a5a5 <Address 0xa5a5a5a5a5a5a5a5 out of bounds>) at 10.0-base-explain-slowquerylog/sql/sql_string.cc:444
      #5  0x000000000069d45c in select_result_text_buffer::save_to (this=0x7fbefdd0fbf0, res=0x7fbefdd0fd70) at 10.0-base-explain-slowquerylog/sql/sql_show.cc:2453
      #6  0x00000000007662e3 in QPF_query::print_explain_str (this=0x7fbef4011570, thd=0x3f7e6b0, out_str=0x7fbefdd0fd70) at 10.0-base-explain-slowquerylog/sql/opt_qpf.cc:139
      #7  0x0000000000766239 in print_qpf_query (lex=0x3f81b68, thd=0x3f7e6b0, str=0x7fbefdd0fd70) at 10.0-base-explain-slowquerylog/sql/opt_qpf.cc:127
      #8  0x00000000008c2545 in MYSQL_QUERY_LOG::write (this=0x3d21230, thd=0x3f7e6b0, current_time=1379963242, user_host=0x7fbefdd10210 "root[root] @ localhost []", user_host_len=25, query_utime=697, lock_utime=0, is_command=false, sql_text=0x7fbef4011418 "EXPLAIN PARTITIONS SELECT 1", sql_text_len=27) at 10.0-base-explain-slowquerylog/sql/log.cc:2833
      #9  0x00000000008bd6e0 in Log_to_file_event_handler::log_slow (this=0x3d20ce0, thd=0x3f7e6b0, current_time=..., user_host=0x7fbefdd10210 "root[root] @ localhost []", user_host_len=25, query_utime=697, lock_utime=0, is_command=false, sql_text=0x7fbef4011418 "EXPLAIN PARTITIONS SELECT 1", sql_text_len=27) at 10.0-base-explain-slowquerylog/sql/log.cc:996
      #10 0x00000000008be1b7 in LOGGER::slow_log_print (this=0x1588680, thd=0x3f7e6b0, query=0x7fbef4011418 "EXPLAIN PARTITIONS SELECT 1", query_length=27, current_utime=84588211526) at 10.0-base-explain-slowquerylog/sql/log.cc:1287
      #11 0x00000000008ca4fd in slow_log_print (thd=0x3f7e6b0, query=0x7fbef4011418 "EXPLAIN PARTITIONS SELECT 1", query_length=27, current_utime=84588211526) at 10.0-base-explain-slowquerylog/sql/log.cc:5870
      #12 0x000000000061dc5b in log_slow_statement (thd=0x3f7e6b0) at 10.0-base-explain-slowquerylog/sql/sql_parse.cc:1573
      #13 0x000000000061d8ff in dispatch_command (command=COM_QUERY, thd=0x3f7e6b0, packet=0x3f83361 "", packet_length=28) at 10.0-base-explain-slowquerylog/sql/sql_parse.cc:1495
      #14 0x000000000061b8bd in do_command (thd=0x3f7e6b0) at 10.0-base-explain-slowquerylog/sql/sql_parse.cc:812
      #15 0x00000000007360b5 in do_handle_one_connection (thd_arg=0x3f7e6b0) at 10.0-base-explain-slowquerylog/sql/sql_connect.cc:1266
      #16 0x0000000000735e23 in handle_one_connection (arg=0x3f7e6b0) at 10.0-base-explain-slowquerylog/sql/sql_connect.cc:1181
      #17 0x0000000000996c52 in pfs_spawn_thread (arg=0x3f79a90) at 10.0-base-explain-slowquerylog/storage/perfschema/pfs.cc:1015
      #18 0x00007fbf023fde9a in start_thread (arg=0x7fbefdd11700) at pthread_create.c:308
      #19 0x00007fbf016f1cbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112

      Seemingly identical stack trace is produced with EXPLAIN EXTENDED instead of EXPLAIN PARTITIONS

      SET log_slow_verbosity='query_plan,explain';
      SET GLOBAL slow_query_log=1;
      SET long_query_time=0.000001;
       
      EXPLAIN EXTENDED SELECT 1 ;

      bzr version-info
      revision-id: psergey@askmonty.org-20130923101756-6fbq7b20nxkhu1bc
      revno: 3693
      branch-nick: 10.0-base-explain-slowquerylog

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              Assignee:
              psergey Sergei Petrunia
              Reporter:
              elenst Elena Stepanova
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                Updated:
                Resolved: