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  1. MariaDB Server
  2. MDEV-22448

SIGSEGV in I_P_List from MDL_context::release_lock on INSERT w/ BACKUP LOCK (on optimized builds)

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      USE test;
      CREATE TABLE t1(a INT);
      CREATE TABLE t2(b INT);
      LOCK TABLES t2 AS a2 WRITE;
      BACKUP LOCK t1;
      UNLOCK TABLES;
      INSERT INTO t1 VALUES(0);
      

      Leads to:

      10.5.3 f544a712c8a2ef3f3ecba80cb2782b1839fb36ab

      Core was generated by `/test/MD010520-mariadb-10.5.3-linux-x86_64-opt/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 0x7f0eac431700 (LWP 1009641))]
      (gdb) bt
      #0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=11) at ../sysdeps/unix/sysv/linux/pthread_kill.c:57
      #1  0x0000557891aabac7 in my_write_core (sig=sig@entry=11) at /test/10.5_opt/mysys/stacktrace.c:518
      #2  0x000055789146d7ca in handle_fatal_signal (sig=11) at /test/10.5_opt/sql/signal_handler.cc:329
      #3  <signal handler called>
      #4  0x0000557891370721 in I_P_List<MDL_ticket, I_P_List_adapter<MDL_ticket, &MDL_ticket::next_in_context, &MDL_ticket::prev_in_context>, I_P_List_null_counter, I_P_List_no_push_back<MDL_ticket> >::remove (this=<optimized out>, a=0x7f0e79c44150) at /test/10.5_opt/sql/sql_plist.h:126
      #5  MDL_context::release_lock (this=<optimized out>, duration=<optimized out>, ticket=0x7f0e79c44150) at /test/10.5_opt/sql/mdl.cc:2879
      #6  0x0000557891370752 in MDL_context::release_lock (this=<optimized out>, ticket=<optimized out>) at /test/10.5_opt/sql/mdl.cc:2897
      #7  0x00005578913f5594 in backup_unlock (thd=thd@entry=0x7f0e79c12018) at /test/10.5_opt/sql/backup.cc:397
      #8  0x000055789122bd34 in THD::cleanup (this=this@entry=0x7f0e79c12018) at /test/10.5_opt/sql/sql_class.cc:1562
      #9  0x00005578911b1b85 in unlink_thd (thd=0x7f0e79c12018) at /test/10.5_opt/sql/mysqld.cc:2617
      #10 0x00005578913670a1 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x7f0eaa0329b8, put_in_cache=put_in_cache@entry=true) at /test/10.5_opt/sql/sql_connect.cc:1433
      #11 0x0000557891367444 in handle_one_connection (arg=arg@entry=0x7f0eaa0329b8) at /test/10.5_opt/sql/sql_connect.cc:1319
      #12 0x00005578916d353a in pfs_spawn_thread (arg=0x7f0eaa04b018) at /test/10.5_opt/storage/perfschema/pfs.cc:2201
      #13 0x00007f0eab8586db in start_thread (arg=0x7f0eac431700) at pthread_create.c:463
      #14 0x00007f0eaac5688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      Bug confirmed present in:
      MariaDB: 10.4.13 (dbg), 10.4.13 (opt), 10.5.2 (dbg), 10.5.2 (opt), 10.5.3 (dbg), 10.5.3 (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)
      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)

      BACKUP LOCK is not available in 10.3 and the testcase does not fail there.

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              Assignee:
              svoj Sergey Vojtovich
              Reporter:
              Roel Roel Van de Paar
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                Created:
                Updated:
                Resolved: