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  1. MariaDB Server
  2. MDEV-16825

SIGSEGV after SIGINT in bootstrap mode

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Minor
    • Resolution: Cannot Reproduce
    • 10.3.9
    • N/A
    • Server
    • None

    Description

      Server crashes with signal 11 on SIGINT when run in --bootstrap mode.

      Reproduce

      #!/bin/sh
      gdbrc=/tmp/bootsrap.gdb
      cat <<EOF > $gdbrc
      start
      break bootstrap
      commands
          commands
              backtrace
              echo bootstrap() entered again!\n
              continue
          end
          signal SIGINT
      end
      continue
      EOF
      gdb -q -x $gdbrc --args mysqld --debug-gdb --silent-startup --bootstrap
      

      Result

      Thread 1 "mysqld" hit Breakpoint 2, bootstrap (file=0x28859f0 [instrumented_stdin]) at /home/midenok/src/mariadb/upstream/src/sql/mysqld.cc:6445
      6445      DBUG_ENTER("bootstrap");
       
      Thread 1 "mysqld" hit Breakpoint 2, bootstrap (file=0x28859f0 [instrumented_stdin]) at /home/midenok/src/mariadb/upstream/src/sql/mysqld.cc:6445
      6445      DBUG_ENTER("bootstrap");
      h1.0  bootstrap (file=0x28859f0 [instrumented_stdin]) at /home/midenok/src/mariadb/upstream/src/sql/mysqld.cc:6445
      h1.1  0x000000000064b560 in mysqld_main (argc=5, argv=0x28a5818) at /home/midenok/src/mariadb/upstream/src/sql/mysqld.cc:6097
      h1.2  0x0000000000646b02 in main (argc=4, argv=0x7fffffffd378) at /home/midenok/src/mariadb/upstream/src/sql/main.cc:25
      bootstrap() entered again!
       
      Thread 32 "mysqld" received signal SIGSEGV, Segmentation fault.
      [Switching to Thread 0x7ffff4c38700 (LWP 18210)]
      0x000000000141b110 in my_hash_free_elements (hash=0x370) at /home/midenok/src/mariadb/upstream/src/mysys/hash.c:118
      118       uint records= hash->records;
      

      Note that bootstrap() reentered on SIGINT.

      h1.0  0x000000000141b110 in my_hash_free_elements (hash=0x370) at /home/midenok/src/mariadb/upstream/src/mysys/hash.c:118
      h1.1  0x000000000141b1fa in my_hash_reset (hash=0x370) at /home/midenok/src/mariadb/upstream/src/mysys/hash.c:171
      h1.2  0x000000000094caba in Master_info_index::free_connections (this=0x0) at /home/midenok/src/mariadb/upstream/src/sql/rpl_mi.cc:1057
      h1.3  0x000000000068b652 in slave_prepare_for_shutdown () at /home/midenok/src/mariadb/upstream/src/sql/slave.cc:1391
      h1.4  0x0000000000656685 in close_connections () at /home/midenok/src/mariadb/upstream/src/sql/mysqld.cc:1764
      h1.5  0x000000000064789d in kill_server (sig_ptr=0x0) at /home/midenok/src/mariadb/upstream/src/sql/mysqld.cc:2034
      h1.6  0x00000000006475ad in kill_server_thread (arg=0x7ffff4c81e6c) at /home/midenok/src/mariadb/upstream/src/sql/mysqld.cc:2066
      h1.7  0x00007ffff7bbd7fc in start_thread (arg=0x7ffff4c38700) at pthread_create.c:465
      h1.8  0x00007ffff5e81b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      (gdb) f 0
      h1.0  0x000000000141b110 in my_hash_free_elements (hash=0x370) at /home/midenok/src/mariadb/upstream/src/mysys/hash.c:118
      118       uint records= hash->records;
      (gdb) p hash
      $1 = (HASH *) 0x370
      

      Info

      Occurrs at any place in bootstrap().

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            midenok Aleksey Midenkov
            midenok Aleksey Midenkov
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            Dates

              Created:
              Updated:
              Resolved:

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