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  1. MariaDB Server
  2. MDEV-9929

MariaDB segfaults on command "mysqld --version" with ignore-db-dir option on /etc/my.cnf



    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 5.5.47, 10.0.24, 10.1.12
    • 5.5.49, 10.0.25, 10.1.14
    • Platform RedHat
    • None


      When I execute command:
      ./mysqld --version
      I get:

      [~/rpmbuild/BUILD/mariadb-10.0.24/sql]# ./mysqld --version
      ./mysqld  Ver 10.0.24-MariaDB for Linux on x86_64 (MariaDB Server)
      160415  7:58:06 [Note] ./mysqld (mysqld 10.0.24-MariaDB) starting as process 293912 ...
      Segmentation fault (core dumped)

      Here is the core-file content:

      Using host libthread_db library "/lib64/libthread_db.so.1".
      Core was generated by `./mysqld --version'.
      Program terminated with signal 11, Segmentation fault.
      #0  0x00007f30ce9b3ccc in free () from /lib64/libc.so.6
      Missing separate debuginfos, use: debuginfo-install glibc-2.17-106.el7_2.4.x86_64 keyutils-libs-1.5.8-3.el7.x86_64 krb5-libs-1.13.2-12.el7_2.x86_64 libaio-0.3.109-13.el7.x86_64 libcom_err-1.42.9-7.el7.x86_64 libgcc-4.8.5-4.el7.x86_64 libselinux-2.2.2-6.el7.x86_64 libstdc++-4.8.5-4.el7.x86_64 nss-softokn-freebl- openssl-libs-1.0.1e-51.el7_2.4.x86_64 pcre-8.32-15.el7.x86_64 xz-libs-5.1.2-12alpha.el7.x86_64 zlib-1.2.7-15.el7.x86_64
      (gdb) where
      #0  0x00007f30ce9b3ccc in free () from /lib64/libc.so.6
      #1  0x0000000000623b0d in ignore_db_dirs_free () at /root/rpmbuild/BUILD/mariadb-10.0.24/sql/sql_show.cc:648
      #2  0x00000000005362cd in clean_up (print_message=<optimized out>) at /root/rpmbuild/BUILD/mariadb-10.0.24/sql/mysqld.cc:2011
      #3  0x000000000053a3b4 in clean_up (print_message=<optimized out>) at /root/rpmbuild/BUILD/mariadb-10.0.24/sql/mysqld.cc:1954
      #4  unireg_abort (exit_code=exit_code@entry=0) at /root/rpmbuild/BUILD/mariadb-10.0.24/sql/mysqld.cc:1954
      #5  0x000000000053e5cc in init_common_variables () at /root/rpmbuild/BUILD/mariadb-10.0.24/sql/mysqld.cc:4082
      #6  0x000000000053fabb in mysqld_main (argc=44, argv=0x2873058) at /root/rpmbuild/BUILD/mariadb-10.0.24/sql/mysqld.cc:5378
      #7  0x00007f30ce955b15 in __libc_start_main () from /lib64/libc.so.6
      #8  0x000000000053435d in _start ()
      (gdb) frame 1
      #1  0x0000000000623b0d in ignore_db_dirs_free () at /root/rpmbuild/BUILD/mariadb-10.0.24/sql/sql_show.cc:648
      648         my_free(opt_ignore_db_dirs);
      (gdb) p opt_ignore_db_dirs
      $1 = 0x2872ec8 ".zfs"

      Here what valgrind says:

      valgrind --tool=memcheck --leak-check=full --track-fds=yes ./mysqld --version
      ==294076== Invalid free() / delete / delete[] / realloc()
      ==294076==    at 0x4C2AD17: free (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
      ==294076==    by 0x623B0C: ignore_db_dirs_free() (sql_show.cc:648)
      ==294076==    by 0x5362CC: clean_up(bool) [clone .part.34] (mysqld.cc:2011)
      ==294076==    by 0x53A3B3: clean_up (mysqld.cc:1954)
      ==294076==    by 0x53A3B3: unireg_abort (mysqld.cc:1954)
      ==294076==    by 0x53E5CB: init_common_variables() (mysqld.cc:4082)
      ==294076==    by 0x53FABA: mysqld_main(int, char**) (mysqld.cc:5378)
      ==294076==    by 0x6525B14: (below main) (in /usr/lib64/libc-2.17.so)
      ==294076==  Address 0x832a6b0 is 240 bytes inside a block of size 480 alloc'd
      ==294076==    at 0x4C29BFD: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
      ==294076==    by 0xBC6916: my_malloc (my_malloc.c:100)
      ==294076==    by 0xBBED23: alloc_root (my_alloc.c:233)
      ==294076==    by 0xBA6AD8: init_default_directories (my_default.c:1204)
      ==294076==    by 0xBA6AD8: my_load_defaults (my_default.c:524)
      ==294076==    by 0x53F818: mysqld_main(int, char**) (mysqld.cc:5241)
      ==294076==    by 0x6525B14: (below main) (in /usr/lib64/libc-2.17.so)

      I see that if macro EMBEDDED_LIBRARY is not defined in this case code below breaks normal mariadb stopping.
      In mysqld.cc in function init_common_variables

      #ifndef EMBEDDED_LIBRARY
        if (opt_abort && !opt_verbose)
      #endif /*!EMBEDDED_LIBRARY*/




            serg Sergei Golubchik
            alexber Alexey B
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            3 Start watching this issue



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