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  1. MariaDB Server
  2. MDEV-15725

Another memory leak in cmp_item_sort_string

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: 10.2
    • Fix Version/s: N/A
    • Component/s: Server
    • Labels:
      None

      Description

      Reproduced with 10.2, I didn't check earlier versions:
      ./mtr main.system_mysql_db_refs

      main.system_mysql_db_refs                [ pass ]     32
      ***Warnings generated in error logs during shutdown after running tests: main.system_mysql_db_refs
       
      mysqld: /home/svoj/devel/maria/mariadb/sql/mysqld.cc:2174: void mysqld_exit(int): Assertion `global_status_var.global_memory_used == 0' failed.
      Attempting backtrace. You can use the following information to find out
      

      Valgrind says:

      ==33496== 612 bytes in 3 blocks are still reachable in loss record 30 of 99
      ==33496==    at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
      ==33496==    by 0x10A2A8F: sf_malloc (safemalloc.c:118)
      ==33496==    by 0x1090079: my_malloc (my_malloc.c:101)
      ==33496==    by 0x775F13: String::real_alloc(unsigned long) (sql_string.cc:45)
      ==33496==    by 0x5F6AE0: String::alloc(unsigned long) (sql_string.h:361)
      ==33496==    by 0x7763A5: String::copy(String const&) (sql_string.cc:176)
      ==33496==    by 0x983564: cmp_item_sort_string::store_value(Item*) (item_cmpfunc.h:1389)
      ==33496==    by 0x97FCBC: Item_equal::val_int() (item_cmpfunc.cc:6662)
      ==33496==    by 0x72DF98: join_read_const_table(THD*, st_join_table*, st_position*) (sql_select.cc:19175)
      ==33496==    by 0x708D2C: make_join_statistics(JOIN*, List<TABLE_LIST>&, st_dynamic_array*) (sql_select.cc:4170)
      ==33496==    by 0x6FFDA9: JOIN::optimize_inner() (sql_select.cc:1537)
      ==33496==    by 0x6FE5E0: JOIN::optimize() (sql_select.cc:1113)
      ==33496==    by 0x70768D: mysql_select(THD*, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) (sql_select.cc:3747)
      ==33496==    by 0x6FBDDF: handle_select(THD*, LEX*, select_result*, unsigned long) (sql_select.cc:376)
      ==33496==    by 0x6C7A54: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:6470)
      ==33496==    by 0x6BD714: mysql_execute_command(THD*) (sql_parse.cc:3481)
      

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              Assignee:
              bar Alexander Barkov
              Reporter:
              svoj Sergey Vojtovich
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                Dates

                Created:
                Updated:
                Resolved: