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Attention: I am only getting the problem on a VALGRIND build
cmake . -DCMAKE_BUILD_TYPE=Debug -DWITH_VALGRIND=YES
See also MDEV-7688, MDEV-7689, MDEV-7690, MDEV-7751 - they all are somewhat similar, probably there are duplicates among them; but effects are different everywhere.
The problem appeared in 5.5 tree with the following revision:
revno: 4255
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revision-id: sanja@askmonty.org-20140731071110-4uyuza0ykesfxe1b
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parent: monty@mariadb.org-20140730102752-3ilbpvmbhr2r9a4x
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committer: sanja@askmonty.org
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branch nick: work-maria-5.5-MDEV-6441
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timestamp: Thu 2014-07-31 10:11:10 +0300
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message:
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MDEV-6441: memory leak
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mysql_derived_prepare() was executed on the statement memory.
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Now it is executed on the runtime memory.
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All bugs induced by this were fixed.
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Test case
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SET sql_mode = ONLY_FULL_GROUP_BY;
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CREATE TABLE t1 (a INT) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (4),(6);
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CREATE TABLE t2 (b INT) ENGINE=MyISAM;
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INSERT INTO t2 VALUES (1),(8);
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CREATE TABLE t3 (c INT) ENGINE=MyISAM;
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INSERT INTO t3 VALUES (8),(3);
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PREPARE stmt FROM "
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SELECT *
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FROM ( SELECT t2.* FROM t2, t3 ) AS from_sq
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WHERE 0 IN (
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SELECT a FROM t1
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WHERE a IN (
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SELECT t1.a FROM t1, t1 t1_1
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WHERE b = t1.a
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)
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)
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";
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EXECUTE stmt;
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EXECUTE stmt;
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Execution stops on the 2nd EXECUTE, the process consumes a lot of CPU, process list shows
+----+------+-----------------+------+---------+------+-----------+------------------------------------------------------------------------------------------------------+----------+
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| Id | User | Host | db | Command | Time | State | Info | Progress |
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+----+------+-----------------+------+---------+------+-----------+------------------------------------------------------------------------------------------------------+----------+
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| 1 | root | localhost | test | Query | 325 | preparing | SELECT *
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FROM ( SELECT t2.* FROM t2, t3 ) AS from_sq
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WHERE 0 IN (
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SELECT a FROM t1
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WHERE a IN | 0.000 |
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| 2 | root | localhost:55329 | test | Query | 0 | NULL | show processlist | 0.000 |
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+----+------+-----------------+------+---------+------+-----------+------------------------------------------------------------------------------------------------------+----------+
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2 rows in set (0.00 sec)
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Some stack traces from the running process (5.5 commit 34f37aa0c0aa87cfb6908500e937516ff37ea6f0):
Thread 2 (Thread 0x7fa34cfb6700 (LWP 20676)):
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#0 0x0000000000683914 in compare_fields_by_table_order (field1=0x7fa34c446b98, field2=0x7fa34c445b58, table_join_idx=0x7fa34c4dd098) at sql/sql_select.cc:12225
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#1 0x0000000000836e2d in bubble_sort<Item> (list_to_sort=0x7fa34c4c42d8, sort_func=0x68387a <compare_fields_by_table_order(Item*, Item*, void*)>, arg=0x7fa34c4dd098) at sql/sql_list.h:604
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#2 0x0000000000833712 in Item_equal::sort (this=0x7fa34c4c4218, compare=0x68387a <compare_fields_by_table_order(Item*, Item*, void*)>, arg=0x7fa34c4dd098) at sql/item_cmpfunc.cc:5901
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#3 0x000000000068468f in substitute_for_best_equal_field (context_tab=0x1, cond=0x7fa34c445c98, cond_equal=0x7fa34c445d88, table_join_idx=0x7fa34c4dd098) at sql/sql_select.cc:12635
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#4 0x0000000000667141 in JOIN::optimize (this=0x7fa34c44d818) at sql/sql_select.cc:1317
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#5 0x000000000066d551 in mysql_select (thd=0x7fa34d118000, rref_pointer_array=0x7fa34c4d6a88, tables=0x7fa34c44c018, wild_num=0, fields=..., conds=0x7fa34c445c98, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2416184064, result=0x7fa34c444098, unit=0x7fa34c4d60c8, select_lex=0x7fa34c4d67c8) at sql/sql_select.cc:3080
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#6 0x0000000000663e63 in handle_select (thd=0x7fa34d118000, lex=0x7fa34c4d6018, result=0x7fa34c444098, setup_tables_done_option=0) at sql/sql_select.cc:319
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#7 0x000000000063c293 in execute_sqlcom_select (thd=0x7fa34d118000, all_tables=0x7fa34c44c018) at sql/sql_parse.cc:4689
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#8 0x000000000063546c in mysql_execute_command (thd=0x7fa34d118000) at sql/sql_parse.cc:2234
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#9 0x0000000000656b1b in Prepared_statement::execute (this=0x7fa34c4cc280, expanded_query=0x7fa34cfb4c50, open_cursor=false) at sql/sql_prepare.cc:3928
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#10 0x0000000000655c32 in Prepared_statement::execute_loop (this=0x7fa34c4cc280, expanded_query=0x7fa34cfb4c50, open_cursor=false, packet=0x0, packet_end=0x0) at sql/sql_prepare.cc:3587
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#11 0x0000000000653d56 in mysql_sql_stmt_execute (thd=0x7fa34d118000) at sql/sql_prepare.cc:2737
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#12 0x000000000063549a in mysql_execute_command (thd=0x7fa34d118000) at sql/sql_parse.cc:2244
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#13 0x000000000063ed98 in mysql_parse (thd=0x7fa34d118000, rawbuf=0x7fa34c41c0d8 "EXECUTE stmt", length=12, parser_state=0x7fa34cfb5610) at sql/sql_parse.cc:5909
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#14 0x00000000006329b3 in dispatch_command (command=COM_QUERY, thd=0x7fa34d118000, packet=0x7fa34d18c001 "EXECUTE stmt", packet_length=12) at sql/sql_parse.cc:1079
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#15 0x0000000000631b3f in do_command (thd=0x7fa34d118000) at sql/sql_parse.cc:793
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#16 0x0000000000739b14 in do_handle_one_connection (thd_arg=0x7fa34d118000) at sql/sql_connect.cc:1266
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#17 0x00000000007395d3 in handle_one_connection (arg=0x7fa34d118000) at sql/sql_connect.cc:1181
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#18 0x0000000000b836e3 in pfs_spawn_thread (arg=0x7fa3513ed760) at storage/perfschema/pfs.cc:1015
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#19 0x00007fa3532bab50 in start_thread (arg=<optimized out>) at pthread_create.c:304
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#20 0x00007fa351bc870d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
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Thread 2 (Thread 0x7fa34cfb6700 (LWP 20676)):
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#0 0x00000000005a1b3a in base_list_iterator::rewind (this=0x7fa34cfb3940) at sql/sql_list.h:459
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#1 0x00000000006a6bbe in List_iterator<Item>::rewind (this=0x7fa34cfb3940) at sql/sql_list.h:549
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#2 0x0000000000836eb6 in bubble_sort<Item> (list_to_sort=0x7fa34c4c42d8, sort_func=0x68387a <compare_fields_by_table_order(Item*, Item*, void*)>, arg=0x7fa34c4dd098) at sql/sql_list.h:614
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#3 0x0000000000833712 in Item_equal::sort (this=0x7fa34c4c4218, compare=0x68387a <compare_fields_by_table_order(Item*, Item*, void*)>, arg=0x7fa34c4dd098) at sql/item_cmpfunc.cc:5901
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#4 0x000000000068468f in substitute_for_best_equal_field (context_tab=0x1, cond=0x7fa34c445c98, cond_equal=0x7fa34c445d88, table_join_idx=0x7fa34c4dd098) at sql/sql_select.cc:12635
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#5 0x0000000000667141 in JOIN::optimize (this=0x7fa34c44d818) at sql/sql_select.cc:1317
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#6 0x000000000066d551 in mysql_select (thd=0x7fa34d118000, rref_pointer_array=0x7fa34c4d6a88, tables=0x7fa34c44c018, wild_num=0, fields=..., conds=0x7fa34c445c98, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2416184064, result=0x7fa34c444098, unit=0x7fa34c4d60c8, select_lex=0x7fa34c4d67c8) at sql/sql_select.cc:3080
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#7 0x0000000000663e63 in handle_select (thd=0x7fa34d118000, lex=0x7fa34c4d6018, result=0x7fa34c444098, setup_tables_done_option=0) at sql/sql_select.cc:319
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#8 0x000000000063c293 in execute_sqlcom_select (thd=0x7fa34d118000, all_tables=0x7fa34c44c018) at sql/sql_parse.cc:4689
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#9 0x000000000063546c in mysql_execute_command (thd=0x7fa34d118000) at sql/sql_parse.cc:2234
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#10 0x0000000000656b1b in Prepared_statement::execute (this=0x7fa34c4cc280, expanded_query=0x7fa34cfb4c50, open_cursor=false) at sql/sql_prepare.cc:3928
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#11 0x0000000000655c32 in Prepared_statement::execute_loop (this=0x7fa34c4cc280, expanded_query=0x7fa34cfb4c50, open_cursor=false, packet=0x0, packet_end=0x0) at sql/sql_prepare.cc:3587
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#12 0x0000000000653d56 in mysql_sql_stmt_execute (thd=0x7fa34d118000) at sql/sql_prepare.cc:2737
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#13 0x000000000063549a in mysql_execute_command (thd=0x7fa34d118000) at sql/sql_parse.cc:2244
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#14 0x000000000063ed98 in mysql_parse (thd=0x7fa34d118000, rawbuf=0x7fa34c41c0d8 "EXECUTE stmt", length=12, parser_state=0x7fa34cfb5610) at sql/sql_parse.cc:5909
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#15 0x00000000006329b3 in dispatch_command (command=COM_QUERY, thd=0x7fa34d118000, packet=0x7fa34d18c001 "EXECUTE stmt", packet_length=12) at sql/sql_parse.cc:1079
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#16 0x0000000000631b3f in do_command (thd=0x7fa34d118000) at sql/sql_parse.cc:793
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#17 0x0000000000739b14 in do_handle_one_connection (thd_arg=0x7fa34d118000) at sql/sql_connect.cc:1266
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#18 0x00000000007395d3 in handle_one_connection (arg=0x7fa34d118000) at sql/sql_connect.cc:1181
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#19 0x0000000000b836e3 in pfs_spawn_thread (arg=0x7fa3513ed760) at storage/perfschema/pfs.cc:1015
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#20 0x00007fa3532bab50 in start_thread (arg=<optimized out>) at pthread_create.c:304
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#21 0x00007fa351bc870d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
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Thread 2 (Thread 0x7fa34cfb6700 (LWP 20676)):
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#0 0x000000000058eace in base_list_iterator::next_fast (this=0x7fa34cfb3a10) at sql/sql_list.h:453
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#1 0x00000000006a7373 in List_iterator_fast<Item_equal>::operator++ (this=0x7fa34cfb3a10) at sql/sql_list.h:569
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#2 0x00000000006846a0 in substitute_for_best_equal_field (context_tab=0x1, cond=0x7fa34c445c98, cond_equal=0x7fa34c445d88, table_join_idx=0x7fa34c4dd098) at sql/sql_select.cc:12633
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#3 0x0000000000667141 in JOIN::optimize (this=0x7fa34c44d818) at sql/sql_select.cc:1317
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#4 0x000000000066d551 in mysql_select (thd=0x7fa34d118000, rref_pointer_array=0x7fa34c4d6a88, tables=0x7fa34c44c018, wild_num=0, fields=..., conds=0x7fa34c445c98, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2416184064, result=0x7fa34c444098, unit=0x7fa34c4d60c8, select_lex=0x7fa34c4d67c8) at sql/sql_select.cc:3080
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#5 0x0000000000663e63 in handle_select (thd=0x7fa34d118000, lex=0x7fa34c4d6018, result=0x7fa34c444098, setup_tables_done_option=0) at sql/sql_select.cc:319
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#6 0x000000000063c293 in execute_sqlcom_select (thd=0x7fa34d118000, all_tables=0x7fa34c44c018) at sql/sql_parse.cc:4689
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#7 0x000000000063546c in mysql_execute_command (thd=0x7fa34d118000) at sql/sql_parse.cc:2234
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#8 0x0000000000656b1b in Prepared_statement::execute (this=0x7fa34c4cc280, expanded_query=0x7fa34cfb4c50, open_cursor=false) at sql/sql_prepare.cc:3928
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#9 0x0000000000655c32 in Prepared_statement::execute_loop (this=0x7fa34c4cc280, expanded_query=0x7fa34cfb4c50, open_cursor=false, packet=0x0, packet_end=0x0) at sql/sql_prepare.cc:3587
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#10 0x0000000000653d56 in mysql_sql_stmt_execute (thd=0x7fa34d118000) at sql/sql_prepare.cc:2737
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#11 0x000000000063549a in mysql_execute_command (thd=0x7fa34d118000) at sql/sql_parse.cc:2244
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#12 0x000000000063ed98 in mysql_parse (thd=0x7fa34d118000, rawbuf=0x7fa34c41c0d8 "EXECUTE stmt", length=12, parser_state=0x7fa34cfb5610) at sql/sql_parse.cc:5909
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#13 0x00000000006329b3 in dispatch_command (command=COM_QUERY, thd=0x7fa34d118000, packet=0x7fa34d18c001 "EXECUTE stmt", packet_length=12) at sql/sql_parse.cc:1079
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#14 0x0000000000631b3f in do_command (thd=0x7fa34d118000) at sql/sql_parse.cc:793
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#15 0x0000000000739b14 in do_handle_one_connection (thd_arg=0x7fa34d118000) at sql/sql_connect.cc:1266
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#16 0x00000000007395d3 in handle_one_connection (arg=0x7fa34d118000) at sql/sql_connect.cc:1181
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#17 0x0000000000b836e3 in pfs_spawn_thread (arg=0x7fa3513ed760) at storage/perfschema/pfs.cc:1015
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#18 0x00007fa3532bab50 in start_thread (arg=<optimized out>) at pthread_create.c:304
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#19 0x00007fa351bc870d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
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