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  1. MariaDB Server
  2. MDEV-22640

SIGSEGV in Item_func_group_concat::add using JSON_ARRAYAGG (on optimized builds)

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      Looks like one missed codepath in MDEV-21915 bugfix.

      USE test;
      CREATE TABLE t(a INT,b INT) ENGINE=MEMORY;
      INSERT INTO t SET a=1;
      SELECT JSON_ARRAYAGG(b LIMIT 2) FROM t;
      

      Leads to:

      10.5.4 69077dea25f6e7cab4ff8927e4429ad62af9de49

      Core was generated by `/test/MD160520-mariadb-10.5.4-linux-x86_64-dbg/bin/mysqld --no-defaults --core-'.
      Program terminated with signal SIGSEGV, Segmentation fault.
      #0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=11)
          at ../sysdeps/unix/sysv/linux/pthread_kill.c:57
      [Current thread is 1 (Thread 0x15365ef9d700 (LWP 1642790))]
      (gdb) bt
      #0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=11) at ../sysdeps/unix/sysv/linux/pthread_kill.c:57
      #1  0x00005566c59b6617 in my_write_core (sig=sig@entry=11) at /test/10.5_opt/mysys/stacktrace.c:518
      #2  0x00005566c53790fa in handle_fatal_signal (sig=11) at /test/10.5_opt/sql/signal_handler.cc:329
      #3  <signal handler called>
      #4  0x00005566c543bbc4 in Item_func_group_concat::add (this=0x15363c047780, exclude_nulls=false) at /test/10.5_opt/sql/item_sum.cc:3999
      #5  0x00005566c51ac148 in Item_sum::aggregator_add (this=0x15363c047780) at /test/10.5_opt/sql/item_sum.h:560
      #6  Item_sum::reset_and_add (this=0x15363c047780) at /test/10.5_opt/sql/item_sum.h:445
      #7  init_sum_functions (func_ptr=0x15363c049320, end_ptr=0x15363c049328) at /test/10.5_opt/sql/sql_select.cc:25660
      #8  0x00005566c51d4c6c in end_send_group (join=0x15363c048c70, join_tab=<optimized out>, end_of_records=<optimized out>) at /test/10.5_opt/sql/sql_select.cc:22016
      #9  0x00005566c51e1bf0 in do_select (procedure=<optimized out>, join=0x15363c048c70) at /test/10.5_opt/sql/sql_select.cc:20105
      #10 JOIN::exec_inner (this=this@entry=0x15363c048c70) at /test/10.5_opt/sql/sql_select.cc:4464
      #11 0x00005566c51e1e67 in JOIN::exec (this=this@entry=0x15363c048c70) at /test/10.5_opt/sql/sql_select.cc:4245
      #12 0x00005566c51e01b2 in mysql_select (thd=thd@entry=0x15363c012018, tables=0x15363c047c68, fields=..., conds=0x0, og_num=<optimized out>, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x15363c048c48, unit=0x15363c015e68, select_lex=0x15363c0470e0) at /test/10.5_opt/sql/sql_select.cc:4669
      #13 0x00005566c51e0b71 in handle_select (thd=thd@entry=0x15363c012018, lex=lex@entry=0x15363c015da0, result=result@entry=0x15363c048c48, setup_tables_done_option=setup_tables_done_option@entry=0) at /test/10.5_opt/sql/sql_select.cc:417
      #14 0x00005566c5187781 in execute_sqlcom_select (thd=thd@entry=0x15363c012018, all_tables=0x15363c047c68) at /test/10.5_opt/sql/sql_parse.cc:6172
      #15 0x00005566c51836a2 in mysql_execute_command (thd=thd@entry=0x15363c012018) at /test/10.5_opt/sql/sql_parse.cc:3901
      #16 0x00005566c518a82c in mysql_parse (thd=0x15363c012018, rawbuf=<optimized out>, length=38, parser_state=0x15365ef9c4b0, is_com_multi=<optimized out>, is_next_command=<optimized out>) at /test/10.5_opt/sql/sql_parse.cc:7957
      #17 0x00005566c517fe75 in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x15363c012018, packet=packet@entry=0x15363c03a019 "", packet_length=packet_length@entry=38, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /test/10.5_opt/sql/sql_parse.cc:1839
      #18 0x00005566c517e106 in do_command (thd=0x15363c012018) at /test/10.5_opt/sql/sql_parse.cc:1358
      #19 0x00005566c5272bf1 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x15365cc329b8, put_in_cache=put_in_cache@entry=true) at /test/10.5_opt/sql/sql_connect.cc:1411
      #20 0x00005566c5272f54 in handle_one_connection (arg=arg@entry=0x15365cc329b8) at /test/10.5_opt/sql/sql_connect.cc:1313
      #21 0x00005566c55de43a in pfs_spawn_thread (arg=0x15365cc4b018) at /test/10.5_opt/storage/perfschema/pfs.cc:2201
      #22 0x000015365e3c46db in start_thread (arg=0x15365ef9d700) at pthread_create.c:463
      #23 0x000015365d7c288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      Bug confirmed present in:
      MariaDB: 10.5.2 (dbg), 10.5.2 (opt), 10.5.3 (dbg), 10.5.3 (opt), 10.5.4 (dbg), 10.5.4 (opt)

      Bug confirmed not present in:
      MariaDB: 10.1.45 (dbg), 10.1.45 (opt), 10.2.32 (dbg), 10.2.32 (opt), 10.3.23 (dbg), 10.3.23 (opt), 10.4.13 (dbg), 10.4.13 (opt)
      MySQL: 5.5.62 (dbg), 5.5.62 (opt), 5.6.47 (dbg), 5.6.47 (opt), 5.7.29 (dbg), 5.7.29 (opt), 8.0.19 (dbg), 8.0.19 (opt)

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              Assignee:
              holyfoot Alexey Botchkov
              Reporter:
              Roel Roel Van de Paar
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                Created:
                Updated:
                Resolved: