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  1. MariaDB Server
  2. MDEV-25499

SIGSEGV in Sys_var_sesvartrack::session_save_default |SIGSEGV in __strlen_avx2

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      See MDEV-22134

      SET GLOBAL session_track_system_variables='a';
      SET SESSION session_track_system_variables=DEFAULT;
      

      Leads to:

      10.6.0 a3e3225cd3b816d47621e749e21a71b6a864a96a (Optimized)

      Core was generated by `/test/MD150421-mariadb-10.6.0-linux-x86_64-opt/bin/mysqld --no-defaults --core-'.
      Program terminated with signal SIGSEGV, Segmentation fault.
      #0  __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:65
      [Current thread is 1 (Thread 0x1460d80d7700 (LWP 231047))]
      (gdb) bt
      #0  __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:65
      #1  0x00005623cbbf5585 in Sys_var_sesvartrack::session_save_default (this=<optimized out>, thd=0x146088000c58, var=0x1460880105b8) at /test/10.6_opt/sql/sys_vars.ic:677
      #2  0x00005623cba22c13 in sys_var::set_default (this=0x5623ccbe3060 <Sys_track_session_sys_vars>, thd=0x146088000c58, var=0x1460880105b8) at /test/10.6_opt/sql/set_var.cc:291
      #3  0x00005623cba22c65 in set_var::update (thd=<optimized out>, this=<optimized out>) at /test/10.6_opt/sql/set_var.cc:857
      #4  set_var::update (this=<optimized out>, thd=<optimized out>) at /test/10.6_opt/sql/set_var.cc:857
      #5  0x00005623cba23e09 in sql_set_variables (thd=thd@entry=0x146088000c58, var_list=var_list@entry=0x146088005ba0, free=free@entry=true) at /test/10.6_opt/sql/set_var.cc:746
      #6  0x00005623cbae1056 in mysql_execute_command (thd=0x146088000c58) at /test/10.6_opt/sql/sql_parse.cc:5030
      #7  0x00005623cbaced84 in mysql_parse (thd=0x146088000c58, rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>) at /test/10.6_opt/sql/sql_parse.cc:8017
      #8  0x00005623cbadad65 in dispatch_command (command=COM_QUERY, thd=0x146088000c58, packet=<optimized out>, packet_length=<optimized out>, blocking=<optimized out>) at /test/10.6_opt/sql/sql_class.h:1331
      #9  0x00005623cbadccd7 in do_command (thd=0x146088000c58, blocking=blocking@entry=true) at /test/10.6_opt/sql/sql_parse.cc:1406
      #10 0x00005623cbbdeeb7 in do_handle_one_connection (connect=<optimized out>, put_in_cache=true) at /test/10.6_opt/sql/sql_connect.cc:1410
      #11 0x00005623cbbdf21d in handle_one_connection (arg=arg@entry=0x5623cf5fb0a8) at /test/10.6_opt/sql/sql_connect.cc:1312
      #12 0x00005623cbf60439 in pfs_spawn_thread (arg=0x5623cf576f58) at /test/10.6_opt/storage/perfschema/pfs.cc:2201
      #13 0x00001460e1a10609 in start_thread (arg=<optimized out>) at pthread_create.c:477
      #14 0x00001460e15ff293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      10.6.0 a3e3225cd3b816d47621e749e21a71b6a864a96a (Debug)

      Core was generated by `/test/MD150421-mariadb-10.6.0-linux-x86_64-dbg/bin/mysqld --no-defaults --core-'.
      Program terminated with signal SIGSEGV, Segmentation fault.
      #0  0x000055d83c4a3a7d in Sys_var_sesvartrack::session_save_default (
          this=<optimized out>, thd=0x1530e4000db8, var=0x1530e4013ca8)
          at /test/10.6_dbg/sql/sys_vars.ic:677
      677	     var->save_result.string_value.length=
      [Current thread is 1 (Thread 0x153138163700 (LWP 225922))]
      (gdb) bt
      #0  0x000055d83c4a3a7d in Sys_var_sesvartrack::session_save_default (this=<optimized out>, thd=0x1530e4000db8, var=0x1530e4013ca8) at /test/10.6_dbg/sql/sys_vars.ic:677
      #1  0x000055d83c2239c9 in sys_var::set_default (this=0x55d83d902c00 <Sys_track_session_sys_vars>, thd=0x1530e4000db8, var=0x1530e4013ca8) at /test/10.6_dbg/sql/set_var.cc:291
      #2  0x000055d83c223a05 in set_var::update (this=<optimized out>, thd=<optimized out>) at /test/10.6_dbg/sql/set_var.cc:859
      #3  0x000055d83c224d42 in sql_set_variables (thd=thd@entry=0x1530e4000db8, var_list=var_list@entry=0x1530e4005ec0, free=free@entry=true) at /test/10.6_dbg/sql/set_var.cc:746
      #4  0x000055d83c32384c in mysql_execute_command (thd=thd@entry=0x1530e4000db8) at /test/10.6_dbg/sql/sql_parse.cc:5030
      #5  0x000055d83c30ca06 in mysql_parse (thd=thd@entry=0x1530e4000db8, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x153138162410) at /test/10.6_dbg/sql/sql_parse.cc:8017
      #6  0x000055d83c31b7df in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x1530e4000db8, packet=packet@entry=0x1530e400b369 "SET SESSION session_track_system_variables=DEFAULT", packet_length=packet_length@entry=50, blocking=blocking@entry=true) at /test/10.6_dbg/sql/sql_class.h:1331
      #7  0x000055d83c31ebd5 in do_command (thd=0x1530e4000db8, blocking=blocking@entry=true) at /test/10.6_dbg/sql/sql_parse.cc:1406
      #8  0x000055d83c47877c in do_handle_one_connection (connect=<optimized out>, connect@entry=0x55d83fb1a308, put_in_cache=put_in_cache@entry=true) at /test/10.6_dbg/sql/sql_connect.cc:1410
      #9  0x000055d83c478d81 in handle_one_connection (arg=arg@entry=0x55d83fb1a308) at /test/10.6_dbg/sql/sql_connect.cc:1312
      #10 0x000055d83c926a03 in pfs_spawn_thread (arg=0x55d83fa3eb48) at /test/10.6_dbg/storage/perfschema/pfs.cc:2201
      #11 0x000015314d318609 in start_thread (arg=<optimized out>) at pthread_create.c:477
      #12 0x000015314cf07293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      Bug confirmed present in:
      MariaDB: 10.2.38 (dbg), 10.2.38 (opt), 10.3.29 (dbg), 10.3.29 (opt), 10.4.19 (dbg), 10.4.19 (opt), 10.5.10 (dbg), 10.5.10 (opt), 10.6.0 (dbg), 10.6.0 (opt)

      Bug (or feature/syntax) confirmed not present in:
      MySQL: 5.5.62 (dbg), 5.5.62 (opt), 5.6.51 (dbg), 5.6.51 (opt), 5.7.33 (dbg), 5.7.33 (opt), 8.0.23 (dbg), 8.0.23 (opt)

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              Assignee:
              sanja Oleksandr Byelkin
              Reporter:
              Roel Roel Van de Paar
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                Dates

                Created:
                Updated: