[MDEV-4418] Valgrind warnings or server crash in Item_equal_iterator<List_iterator_fast, Item>::get_curr_field, from Item_equal::contains Created: 2013-04-22  Updated: 2013-08-26  Resolved: 2013-08-21

Status: Closed
Project: MariaDB Server
Component/s: None
Affects Version/s: 10.0.1, 5.5.30, 5.3.12
Fix Version/s: 10.0.5, 5.5.33, 5.3.13

Type: Bug Priority: Blocker
Reporter: Elena Stepanova Assignee: Igor Babaev
Resolution: Fixed Votes: 0
Labels: None

Issue Links:
Relates
relates to MDEV-4420 Assertion `item->type() == Item::FIEL... Closed
relates to MDEV-4355 Wrong result (extra row) with AND and... Closed

 Description   

The problem appeared on 5.3 with the following revision:

revno: 3628
 
revision-id: igor@askmonty.org-20130225031611-jk8lyhhjazov66qc
 
committer: Igor Babaev <igor@askmonty.org>
 
branch nick: maria-5.3-mdev4177
 
timestamp: Sun 2013-02-24 19:16:11 -0800
 
message:
 
  Fixed bug mdev-4177

It might well be related to, or even be a duplicate of, MDEV-4274 and/or MDEV-4413, but the stack trace is different here, so I will file it separately, this way it will be searchable.

Valgrind warnings on 5.3 (with BUILD/compile-pentium-valgrind-max-no-ndb):

==21978== Thread 4:
 
==21978== Conditional jump or move depends on uninitialised value(s)
 
==21978==    at 0x5DAE21: Item_equal::contains(Field*) (item_cmpfunc.cc:5560)
 
==21978==    by 0x588B7E: Item_field::find_item_equal(COND_EQUAL*) (item.cc:4881)
 
==21978==    by 0x729E5A: eliminate_item_equal(Item*, COND_EQUAL*, Item_equal*) (sql_select.cc:11845)
 
==21978==    by 0x72A7CE: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12136)
 
==21978==    by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
 
==21978==    by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
 
==21978==    by 0x70DF46: JOIN::optimize() (sql_select.cc:1237)
 
==21978==    by 0x7144E6: 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:2976)
 
==21978==    by 0x70AF26: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:288)
 
==21978==    by 0x6963DE: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5172)
 
==21978==    by 0x68D19D: mysql_execute_command(THD*) (sql_parse.cc:2305)
 
==21978==    by 0x698E58: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6173)
 
==21978==    by 0x68A941: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1243)
 
==21978==    by 0x689BDF: do_command(THD*) (sql_parse.cc:923)
 
==21978==    by 0x68663A: handle_one_connection (sql_connect.cc:1231)
 
==21978==    by 0x548DE99: start_thread (pthread_create.c:308)
 
==21978== Use of uninitialised value of size 8
 
==21978==    at 0x5DF48E: Item_equal_iterator<List_iterator_fast, Item>::get_curr_field() (item_cmpfunc.h:1856)
 
==21978==    by 0x5DADED: Item_equal::contains(Field*) (item_cmpfunc.cc:5562)
 
==21978==    by 0x588B7E: Item_field::find_item_equal(COND_EQUAL*) (item.cc:4881)
 
==21978==    by 0x729E5A: eliminate_item_equal(Item*, COND_EQUAL*, Item_equal*) (sql_select.cc:11845)
 
==21978==    by 0x72A7CE: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12136)
 
==21978==    by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
 
==21978==    by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
 
==21978==    by 0x70DF46: JOIN::optimize() (sql_select.cc:1237)
 
==21978==    by 0x7144E6: 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:2976)
 
==21978==    by 0x70AF26: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:288)
 
==21978==    by 0x6963DE: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5172)
 
==21978==    by 0x68D19D: mysql_execute_command(THD*) (sql_parse.cc:2305)
 
==21978==    by 0x698E58: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6173)
 
==21978==    by 0x68A941: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1243)
 
==21978==    by 0x689BDF: do_command(THD*) (sql_parse.cc:923)
 
==21978==    by 0x68663A: handle_one_connection (sql_connect.cc:1231)
 
==21978== Use of uninitialised value of size 8
 
==21978==    at 0x5DF4AF: Item_equal_iterator<List_iterator_fast, Item>::get_curr_field() (item_cmpfunc.h:1857)
 
==21978==    by 0x5DADED: Item_equal::contains(Field*) (item_cmpfunc.cc:5562)
 
==21978==    by 0x588B7E: Item_field::find_item_equal(COND_EQUAL*) (item.cc:4881)
 
==21978==    by 0x729E5A: eliminate_item_equal(Item*, COND_EQUAL*, Item_equal*) (sql_select.cc:11845)
 
==21978==    by 0x72A7CE: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12136)
 
==21978==    by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
 
==21978==    by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
 
==21978==    by 0x70DF46: JOIN::optimize() (sql_select.cc:1237)
 
==21978==    by 0x7144E6: 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:2976)
 
==21978==    by 0x70AF26: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:288)
 
==21978==    by 0x6963DE: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5172)
 
==21978==    by 0x68D19D: mysql_execute_command(THD*) (sql_parse.cc:2305)
 
==21978==    by 0x698E58: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6173)
 
==21978==    by 0x68A941: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1243)
 
==21978==    by 0x689BDF: do_command(THD*) (sql_parse.cc:923)
 
==21978==    by 0x68663A: handle_one_connection (sql_connect.cc:1231)
 
==21978== Use of uninitialised value of size 8
 
==21978==    at 0x5664F7: base_list_iterator::next_fast() (sql_list.h:449)
 
==21978==    by 0x56895C: List_iterator_fast<Item>::operator++(int) (sql_list.h:561)
 
==21978==    by 0x5DF467: Item_equal_iterator<List_iterator_fast, Item>::operator++(int) (item_cmpfunc.h:1844)
 
==21978==    by 0x5DAE18: Item_equal::contains(Field*) (item_cmpfunc.cc:5560)
 
==21978==    by 0x588B7E: Item_field::find_item_equal(COND_EQUAL*) (item.cc:4881)
 
==21978==    by 0x729E5A: eliminate_item_equal(Item*, COND_EQUAL*, Item_equal*) (sql_select.cc:11845)
 
==21978==    by 0x72A7CE: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12136)
 
==21978==    by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
 
==21978==    by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
 
==21978==    by 0x70DF46: JOIN::optimize() (sql_select.cc:1237)
 
==21978==    by 0x7144E6: 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:2976)
 
==21978==    by 0x70AF26: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:288)
 
==21978==    by 0x6963DE: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5172)
 
==21978==    by 0x68D19D: mysql_execute_command(THD*) (sql_parse.cc:2305)
 
==21978==    by 0x698E58: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6173)
 
==21978==    by 0x68A941: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1243)

Crash on 5.5:

#2  0x00000000007c6d68 in handle_fatal_signal (sig=11) at /data/bzr/5.5/sql/signal_handler.cc:262
 
#3  <signal handler called>
 
#4  0x000000000067e8c2 in Item_equal_iterator<List_iterator_fast, Item>::get_curr_field (this=0x7f9255043f30) at /data/bzr/5.5/sql/item_cmpfunc.h:1849
 
#5  0x0000000000807a10 in Item_equal::contains (this=0x7f924c021380, field=0x7f924c044e00) at /data/bzr/5.5/sql/item_cmpfunc.cc:5646
 
#6  0x00000000007e2ac5 in Item_field::find_item_equal (this=0x7f924c008a70, cond_equal=0x7f924c009308) at /data/bzr/5.5/sql/item.cc:5243
 
#7  0x000000000065c39a in eliminate_item_equal (cond=0x0, upper_levels=0x7f924c009308, item_equal=0x7f924c021880) at /data/bzr/5.5/sql/sql_select.cc:12124
 
#8  0x000000000065cd26 in substitute_for_best_equal_field (context_tab=0x1, cond=0x7f924c021880, cond_equal=0x7f924c009308, table_join_idx=0x7f924c021a78) at /data/bzr/5.5/sql/sql_select.cc:12414
 
#9  0x000000000065ca0b in substitute_for_best_equal_field (context_tab=0x1, cond=0x7f924c008d80, cond_equal=0x7f924c01ffe8, table_join_idx=0x7f924c021a78) at /data/bzr/5.5/sql/sql_select.cc:12341
 
#10 0x000000000065ca0b in substitute_for_best_equal_field (context_tab=0x1, cond=0x7f924c01fef8, cond_equal=0x7f924c01ffe8, table_join_idx=0x7f924c021a78) at /data/bzr/5.5/sql/sql_select.cc:12341
 
#11 0x000000000064060c in JOIN::optimize (this=0x7f924c0200a0) at /data/bzr/5.5/sql/sql_select.cc:1288
 
#12 0x00000000006469e1 in mysql_select (thd=0x37c1820, rref_pointer_array=0x37c4828, tables=0x7f924c007730, wild_num=1, fields=..., conds=0x7f924c01fef8, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x7f924c009490, unit=0x37c3ef8, select_lex=0x37c45d0) at /data/bzr/5.5/sql/sql_select.cc:3048
 
#13 0x000000000063d5ea in handle_select (thd=0x37c1820, lex=0x37c3e48, result=0x7f924c009490, setup_tables_done_option=0) at /data/bzr/5.5/sql/sql_select.cc:318
 
#14 0x000000000061643d in execute_sqlcom_select (thd=0x37c1820, all_tables=0x7f924c007730) at /data/bzr/5.5/sql/sql_parse.cc:4641
 
#15 0x000000000060ee8c in mysql_execute_command (thd=0x37c1820) at /data/bzr/5.5/sql/sql_parse.cc:2195
 
#16 0x0000000000618cdc in mysql_parse (thd=0x37c1820, rawbuf=0x7f924c0074c8 "SELECT * FROM t1, t2 WHERE ( c = b ) AND ( 0 OR ( b = 'h' OR a = 136 ) AND ( d = b ) )", length=86, parser_state=0x7f9255045500) at /data/bzr/5.5/sql/sql_parse.cc:5759
 
#17 0x000000000060c3dc in dispatch_command (command=COM_QUERY, thd=0x37c1820, packet=0x38b6c41 "SELECT * FROM t1, t2 WHERE ( c = b ) AND ( 0 OR ( b = 'h' OR a = 136 ) AND ( d = b ) )", packet_length=86) at /data/bzr/5.5/sql/sql_parse.cc:1068
 
#18 0x000000000060b61d in do_command (thd=0x37c1820) at /data/bzr/5.5/sql/sql_parse.cc:794
 
#19 0x000000000071092d in do_handle_one_connection (thd_arg=0x37c1820) at /data/bzr/5.5/sql/sql_connect.cc:1266
 
#20 0x0000000000710314 in handle_one_connection (arg=0x37c1820) at /data/bzr/5.5/sql/sql_connect.cc:1181
 
#21 0x000000000096c0b8 in pfs_spawn_thread (arg=0x385fa70) at /data/bzr/5.5/storage/perfschema/pfs.cc:1015
 
#22 0x00007f9260732e9a in start_thread (arg=0x7f9255046700) at pthread_create.c:308
 
#23 0x00007f925fa26cbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112

Test case:

CREATE TABLE t1 (a INT, b VARCHAR(1)) ENGINE=MyISAM;
 
INSERT INTO t1 VALUES (0,'j'),(8,'v');
 
 
 
CREATE TABLE t2 (c VARCHAR(1), d VARCHAR(1)) ENGINE=MyISAM;
 
INSERT INTO t2 VALUES ('k','k');
 
 
 
SELECT * FROM t1, t2 WHERE ( c = b ) AND ( 0 OR ( b = 'h' OR a = 136 ) AND ( d = b ) );



 Comments   
Comment by Elena Stepanova [ 2013-04-30 ]

The bug still exists on the following revision:

revision-id: igor@askmonty.org-20130430033140-qhx9wsgc5w2dx14r
date: 2013-04-29 20:31:40 -0700
build-date: 2013-04-30 23:45:52 +0400
revno: 3653
branch-nick: 5.3

Valgrind errors from this revision:

==20182== Thread 4:
==20182== Conditional jump or move depends on uninitialised value(s)
==20182== at 0x5DAE21: Item_equal::contains(Field*) (item_cmpfunc.cc:5560)
==20182== by 0x588B7E: Item_field::find_item_equal(COND_EQUAL*) (item.cc:4881)
==20182== by 0x729E5A: eliminate_item_equal(Item*, COND_EQUAL*, Item_equal*) (sql_select.cc:11845)
==20182== by 0x72A7CE: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12136)
==20182== by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
==20182== by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
==20182== by 0x70DF46: JOIN::optimize() (sql_select.cc:1237)
==20182== by 0x7144E6: 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:2976)
==20182== by 0x70AF26: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:288)
==20182== by 0x6963DE: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5172)
==20182== by 0x68D19D: mysql_execute_command(THD*) (sql_parse.cc:2305)
==20182== by 0x698E58: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6173)
==20182== by 0x68A941: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1243)
==20182== by 0x689BDF: do_command(THD*) (sql_parse.cc:923)
==20182== by 0x68663A: handle_one_connection (sql_connect.cc:1231)
==20182== by 0x548DE99: start_thread (pthread_create.c:308)
==20182== Use of uninitialised value of size 8
==20182== at 0x5DF48E: Item_equal_iterator<List_iterator_fast, Item>::get_curr_field() (item_cmpfunc.h:1856)
==20182== by 0x5DADED: Item_equal::contains(Field*) (item_cmpfunc.cc:5562)
==20182== by 0x588B7E: Item_field::find_item_equal(COND_EQUAL*) (item.cc:4881)
==20182== by 0x729E5A: eliminate_item_equal(Item*, COND_EQUAL*, Item_equal*) (sql_select.cc:11845)
==20182== by 0x72A7CE: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12136)
==20182== by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
==20182== by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
==20182== by 0x70DF46: JOIN::optimize() (sql_select.cc:1237)
==20182== by 0x7144E6: 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:2976)
==20182== by 0x70AF26: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:288)
==20182== by 0x6963DE: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5172)
==20182== by 0x68D19D: mysql_execute_command(THD*) (sql_parse.cc:2305)
==20182== by 0x698E58: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6173)
==20182== by 0x68A941: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1243)
==20182== by 0x689BDF: do_command(THD*) (sql_parse.cc:923)
==20182== by 0x68663A: handle_one_connection (sql_connect.cc:1231)
==20182== Use of uninitialised value of size 8
==20182== at 0x5DF4AF: Item_equal_iterator<List_iterator_fast, Item>::get_curr_field() (item_cmpfunc.h:1857)
==20182== by 0x5DADED: Item_equal::contains(Field*) (item_cmpfunc.cc:5562)
==20182== by 0x588B7E: Item_field::find_item_equal(COND_EQUAL*) (item.cc:4881)
==20182== by 0x729E5A: eliminate_item_equal(Item*, COND_EQUAL*, Item_equal*) (sql_select.cc:11845)
==20182== by 0x72A7CE: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12136)
==20182== by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
==20182== by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
==20182== by 0x70DF46: JOIN::optimize() (sql_select.cc:1237)
==20182== by 0x7144E6: 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:2976)
==20182== by 0x70AF26: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:288)
==20182== by 0x6963DE: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5172)
==20182== by 0x68D19D: mysql_execute_command(THD*) (sql_parse.cc:2305)
==20182== by 0x698E58: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6173)
==20182== by 0x68A941: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1243)
==20182== by 0x689BDF: do_command(THD*) (sql_parse.cc:923)
==20182== by 0x68663A: handle_one_connection (sql_connect.cc:1231)
==20182== Use of uninitialised value of size 8
==20182== at 0x5664F7: base_list_iterator::next_fast() (sql_list.h:449)
==20182== by 0x56895C: List_iterator_fast<Item>::operator++(int) (sql_list.h:561)
==20182== by 0x5DF467: Item_equal_iterator<List_iterator_fast, Item>::operator++(int) (item_cmpfunc.h:1844)
==20182== by 0x5DAE18: Item_equal::contains(Field*) (item_cmpfunc.cc:5560)
==20182== by 0x588B7E: Item_field::find_item_equal(COND_EQUAL*) (item.cc:4881)
==20182== by 0x729E5A: eliminate_item_equal(Item*, COND_EQUAL*, Item_equal*) (sql_select.cc:11845)
==20182== by 0x72A7CE: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12136)
==20182== by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
==20182== by 0x72A4B5: substitute_for_best_equal_field(st_join_table*, Item*, COND_EQUAL*, void*) (sql_select.cc:12063)
==20182== by 0x70DF46: JOIN::optimize() (sql_select.cc:1237)
==20182== by 0x7144E6: 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:2976)
==20182== by 0x70AF26: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:288)
==20182== by 0x6963DE: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5172)
==20182== by 0x68D19D: mysql_execute_command(THD*) (sql_parse.cc:2305)
==20182== by 0x698E58: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6173)
==20182== by 0x68A941: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1243)

Comment by Igor Babaev [ 2013-08-21 ]

The fix for this bug was pushed into the 5.3 tree and later merged into the 5.5 tree.

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