Uploaded image for project: 'MariaDB Server'
  1. MariaDB Server
  2. MDEV-3404

LP:1002630 - Valgrind warnings 'Invalid read' in subselect_engine::calc_const_tables with SELECT and IN subqueries, GROUP BY, HAVING, materialization+semijoin

    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
    • Labels:

      Description

      ==16653== Invalid read of size 1
      ==16653== at 0x6867D7: subselect_engine::calc_const_tables(List<TABLE_LIST>&) (item_subselect.cc:3643)
      ==16653== by 0x686850: subselect_single_select_engine::upper_select_const_tables() (item_subselect.cc:3652)
      ==16653== by 0x67E7A0: Item_subselect::update_used_tables() (item_subselect.cc:786)
      ==16653== by 0x6034AA: Item_ref::update_used_tables() (item.cc:9153)
      ==16653== by 0x61D959: Item_func::update_used_tables() (item_func.cc:423)
      ==16653== by 0x779094: JOIN::exec() (sql_select.cc:2592)
      ==16653== by 0x77A30C: mysql_select(THD*, Item**, 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:2963)
      ==16653== by 0x770E14: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:286)
      ==16653== by 0x6FF3E8: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5152)
      ==16653== by 0x6F64A5: mysql_execute_command(THD*) (sql_parse.cc:2285)
      ==16653== by 0x701DC3: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6153)
      ==16653== by 0x6F3C43: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1228)
      ==16653== by 0x6F2F77: do_command(THD*) (sql_parse.cc:923)
      ==16653== by 0x6EFDC5: handle_one_connection (sql_connect.cc:1218)
      ==16653== by 0x58B6A4E: start_thread (in /lib64/libpthread-2.11.2.so)
      ==16653== by 0x651D82C: clone (in /lib64/libc-2.11.2.so)
      ==16653== Address 0xfbaf89f is 2,143 bytes inside a block of size 4,164 free'd
      ==16653== at 0x4C25F7B: free (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
      ==16653== by 0xC4082F: _myfree (safemalloc.c:337)
      ==16653== by 0xC3FB13: free_root (my_alloc.c:366)
      ==16653== by 0x7983F0: free_tmp_table(THD*, st_table*) (sql_select.cc:15185)
      ==16653== by 0x6883B8: subselect_hash_sj_engine::cleanup() (item_subselect.cc:4474)
      ==16653== by 0x67CD65: Item_subselect::cleanup() (item_subselect.cc:130)
      ==16653== by 0x67CF40: Item_in_subselect::cleanup() (item_subselect.cc:167)
      ==16653== by 0x78BE1B: st_join_table::cleanup() (sql_select.cc:10077)
      ==16653== by 0x78C8C7: JOIN::cleanup(bool) (sql_select.cc:10383)
      ==16653== by 0x78C5C4: JOIN::join_free() (sql_select.cc:10303)
      ==16653== by 0x778A91: JOIN::exec() (sql_select.cc:2514)
      ==16653== by 0x77A30C: mysql_select(THD*, Item**, 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:2963)
      ==16653== by 0x770E14: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:286)
      ==16653== by 0x6FF3E8: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5152)
      ==16653== by 0x6F64A5: mysql_execute_command(THD*) (sql_parse.cc:2285)
      ==16653== by 0x701DC3: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6153)

      bzr version-info
      revision-id: <email address hidden>
      date: 2012-05-21 19:37:46 +0500
      revno: 3527

      Also reproducible on maria/5.5 revno 3413.
      Reproducible with MyISAM, Aria, InnoDB.

      Minimal optimizer_switch:
      materialization=on,semijoin=on

      Full optimizer_switch (default):
      index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on

      EXPLAIN with default optimizer_switch:

      id select_type table type possible_keys key key_len ref rows filtered Extra
      1 PRIMARY <subquery3> const distinct_key distinct_key 8 const,const 1 100.00 Using temporary; Using filesort
      1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
      3 MATERIALIZED t1 ALL NULL NULL NULL NULL 2 100.00
      2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00
      Warnings:
      Note 1003 select (select sum(`test`.`t1`.`a`) from `test`.`t1`) AS `t1sum`,`test`.`t2`.`b` AS `b` from <materialize> (select max(`test`.`t1`.`a`),min(`test`.`t1`.`a`) from `test`.`t1`) join `test`.`t2` where ((`<subquery3>`.`MIN(a)` = 1) and (`<subquery3>`.`MAX(a)` = 1)) group by `test`.`t2`.`b` having (`t1sum` <> 1)

      1. Test case:

      SET optimizer_switch = 'materialization=on,semijoin=on';

      CREATE TABLE t1 (a INT);
      INSERT INTO t1 VALUES (1),(7);

      CREATE TABLE t2 (b INT);
      INSERT INTO t2 VALUES (4),(6);

      SELECT ( SELECT SUM(a) FROM t1 ) AS t1sum, b
      FROM t2
      WHERE (1,1) IN ( SELECT MAX(a), MIN(a) FROM t1 )
      GROUP BY b
      HAVING t1sum <> 1;

      1. End of test case

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                psergey Sergei Petrunia
                Reporter:
                elenst Elena Stepanova
              • Votes:
                0 Vote for this issue
                Watchers:
                0 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: