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  1. MariaDB Server
  2. MDEV-5060

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

        Details

        • Type: Bug
        • Status: Closed
        • 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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                relates to

                Task - A task that needs to be done. MDEV-407 Print EXPLAIN [ANALYZE] in the slow query log

                • Major - Major loss of function.
                • Closed

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