[MDEV-18911] Assertion `(templ->is_virtual && !field) || (field && field->prefix_len ? field->prefix_len == len : templ->mysql_col_len == len)' failed row_sel_field_store_in_mysql_format_func Created: 2019-03-13  Updated: 2024-01-24

Status: Confirmed
Project: MariaDB Server
Component/s: Optimizer, Storage Engine - InnoDB, Virtual Columns
Affects Version/s: 10.4, 10.5, 10.6, 10.7, 10.11
Fix Version/s: 10.4, 10.5, 10.6, 10.11

Type: Bug Priority: Critical
Reporter: Elena Stepanova Assignee: Nikita Malyavin
Resolution: Unresolved Votes: 0
Labels: not-11.0+

Issue Links:
Duplicate
is duplicated by MDEV-33259 Server crash/hang executing simple qu... Closed
Relates
relates to MDEV-22395 Assertion `templ->mbmaxlen > templ->m... Closed
relates to MDEV-24724 SELECT from table with indexed virtua... Confirmed
relates to MDEV-25603 Assertion `templ->mysql_col_len == le... Confirmed

 Description   

Note: I'm filing it for 10.4 because it's the only version I can reproduce it with; but the failure depends on the execution plan. I can get rid of the failure by setting rowid_filter=off in optimizer_switch on 10.4, but I can't do the reverse on 10.3, so I have no information whether the problem exists in previous version.

Note: Run with --repeat=N. The test case appears deterministic, but the failure is still sporadic. It usually fails for me withing first 1-2 attempts, but it can vary on different machines and builds.

--source include/have_innodb.inc
 
 
 
SET @stats.save= @@innodb_stats_persistent;
 
SET GLOBAL innodb_stats_persistent= ON;
 
 
 
CREATE TABLE t1 ( 
  a CHAR(100),
 
  pk INTEGER AUTO_INCREMENT,
 
  b BIT(8),
 
  c CHAR(115) AS (a) VIRTUAL,
 
  PRIMARY KEY(pk),
 
  KEY(c),
 
  KEY(b)
 
) ENGINE=InnoDB;
 
INSERT INTO t1 (a,b) VALUES ('foo',b'0'),('',NULL),(NULL,b'1');
 
 
 
CREATE TABLE t2 (f CHAR(100)) ENGINE=InnoDB;
 
 
 
SELECT t1a.* FROM t1 AS t1a JOIN t1 AS t1b LEFT JOIN t2  ON (f = t1b.a) WHERE t1a.b >= 0 AND t1a.c = t1b.a;
 
 
 
# Cleanup
 
DROP TABLE t1, t2;
 
SET GLOBAL innodb_stats_persistent= @stats.save;

10.4 6d68a346

 
mysqld: /data/src/10.4/storage/innobase/row/row0sel.cc:2854: void row_sel_field_store_in_mysql_format_func(byte*, const mysql_row_templ_t*, const dict_index_t*, ulint, const byte*, ulint): Assertion `(templ->is_virtual && !field) || (field && field->prefix_len ? field->prefix_len == len : templ->mysql_col_len == len)' failed.
 
190313 15:11:45 [ERROR] mysqld got signal 6 ;
 
 
 
#7  0x00007fb2b35aeee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
 
#8  0x0000564f5f0195f8 in row_sel_field_store_in_mysql_format_func (dest=0x7fb2641a1241 ' ' <repeats 100 times>, "\003", templ=0x7fb26406cac0, index=0x7fb26414feb8, field_no=1, data=0x7fb2ad0a40f1 "\200", len=4) at /data/src/10.4/storage/innobase/row/row0sel.cc:2851
 
#9  0x0000564f5f019d14 in row_sel_store_mysql_field (mysql_rec=0x7fb2641a1240 "\373", ' ' <repeats 100 times>, "\003", prebuilt=0x7fb264152508, rec=0x7fb2ad0a407e "foo", ' ' <repeats 112 times>, "\200", index=0x7fb26414feb8, offsets=0x7fb2ac8d5220, field_no=1, templ=0x7fb26406cac0) at /data/src/10.4/storage/innobase/row/row0sel.cc:3006
 
#10 0x0000564f5f01bdab in row_search_idx_cond_check (mysql_rec=0x7fb2641a1240 "\373", ' ' <repeats 100 times>, "\003", prebuilt=0x7fb264152508, rec=0x7fb2ad0a407e "foo", ' ' <repeats 112 times>, "\200", offsets=0x7fb2ac8d5220) at /data/src/10.4/storage/innobase/row/row0sel.cc:3888
 
#11 0x0000564f5f01f6a9 in row_search_mvcc (buf=0x7fb2641a1240 "\373", ' ' <repeats 100 times>, "\003", mode=PAGE_CUR_GE, prebuilt=0x7fb264152508, match_mode=1, direction=0) at /data/src/10.4/storage/innobase/row/row0sel.cc:5205
 
#12 0x0000564f5ee7d7f1 in ha_innobase::index_read (this=0x7fb264151518, buf=0x7fb2641a1240 "\373", ' ' <repeats 100 times>, "\003", key_ptr=0x7fb26407ca70 "", key_len=116, find_flag=HA_READ_KEY_EXACT) at /data/src/10.4/storage/innobase/handler/ha_innodb.cc:9360
 
#13 0x0000564f5eb4b404 in handler::index_read_map (this=0x7fb264151518, buf=0x7fb2641a1240 "\373", ' ' <repeats 100 times>, "\003", key=0x7fb26407ca70 "", keypart_map=1, find_flag=HA_READ_KEY_EXACT) at /data/src/10.4/sql/handler.h:3594
 
#14 0x0000564f5eb3d2b7 in handler::ha_index_read_map (this=0x7fb264151518, buf=0x7fb2641a1240 "\373", ' ' <repeats 100 times>, "\003", key=0x7fb26407ca70 "", keypart_map=1, find_flag=HA_READ_KEY_EXACT) at /data/src/10.4/sql/handler.cc:3040
 
#15 0x0000564f5e86d891 in join_read_always_key (tab=0x7fb26407bf18) at /data/src/10.4/sql/sql_select.cc:20776
 
#16 0x0000564f5e86bd5d in sub_select (join=0x7fb264019718, join_tab=0x7fb26407bf18, end_of_records=false) at /data/src/10.4/sql/sql_select.cc:20015
 
#17 0x0000564f5e86c4cb in evaluate_join_record (join=0x7fb264019718, join_tab=0x7fb26407bb50, error=0) at /data/src/10.4/sql/sql_select.cc:20238
 
#18 0x0000564f5e86bdbf in sub_select (join=0x7fb264019718, join_tab=0x7fb26407bb50, end_of_records=false) at /data/src/10.4/sql/sql_select.cc:20018
 
#19 0x0000564f5e86b2ed in do_select (join=0x7fb264019718, procedure=0x0) at /data/src/10.4/sql/sql_select.cc:19556
 
#20 0x0000564f5e841da9 in JOIN::exec_inner (this=0x7fb264019718) at /data/src/10.4/sql/sql_select.cc:4371
 
#21 0x0000564f5e840f50 in JOIN::exec (this=0x7fb264019718) at /data/src/10.4/sql/sql_select.cc:4153
 
#22 0x0000564f5e842602 in mysql_select (thd=0x7fb264000b00, tables=0x7fb264015bd8, wild_num=1, fields=..., conds=0x7fb264018c60, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x7fb2640196f0, unit=0x7fb264004a28, select_lex=0x7fb264015608) at /data/src/10.4/sql/sql_select.cc:4585
 
#23 0x0000564f5e832b7a in handle_select (thd=0x7fb264000b00, lex=0x7fb264004960, result=0x7fb2640196f0, setup_tables_done_option=0) at /data/src/10.4/sql/sql_select.cc:424
 
#24 0x0000564f5e7fbf4b in execute_sqlcom_select (thd=0x7fb264000b00, all_tables=0x7fb264015bd8) at /data/src/10.4/sql/sql_parse.cc:6651
 
#25 0x0000564f5e7f1206 in mysql_execute_command (thd=0x7fb264000b00) at /data/src/10.4/sql/sql_parse.cc:3888
 
#26 0x0000564f5e7ffe8b in mysql_parse (thd=0x7fb264000b00, rawbuf=0x7fb2640154c8 "SELECT t1a.* FROM t1 AS t1a JOIN t1 AS t1b LEFT JOIN t2  ON (f = t1b.a) WHERE t1a.b >= 0 AND t1a.c = t1b.a", length=106, parser_state=0x7fb2ac8d7180, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:8204
 
#27 0x0000564f5e7eb4cd in dispatch_command (command=COM_QUERY, thd=0x7fb264000b00, packet=0x7fb264139ff1 "", packet_length=106, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:1829
 
#28 0x0000564f5e7e9cb3 in do_command (thd=0x7fb264000b00) at /data/src/10.4/sql/sql_parse.cc:1358
 
#29 0x0000564f5e9639e5 in do_handle_one_connection (connect=0x564f61f954f0) at /data/src/10.4/sql/sql_connect.cc:1399
 
#30 0x0000564f5e963756 in handle_one_connection (arg=0x564f61f954f0) at /data/src/10.4/sql/sql_connect.cc:1302
 
#31 0x0000564f5ee59253 in pfs_spawn_thread (arg=0x564f61fdb360) at /data/src/10.4/storage/perfschema/pfs.cc:1862
 
#32 0x00007fb2b5285494 in start_thread (arg=0x7fb2ac8d8700) at pthread_create.c:333
 
#33 0x00007fb2b366b93f in clone () from /lib/x86_64-linux-gnu/libc.so.6



 Comments   
Comment by Alice Sherepa [ 2024-01-24 ]

still reproducible on 10.4-10.11, not repeatable on 11.0+, but that is probably because of the change of the execution plan:
10.4-10.11:

explain extended
 
SELECT t1a.* FROM t1 AS t1a JOIN t1 AS t1b LEFT JOIN t2  ON (f = t1b.a) WHERE t1a.b >= 0 AND t1a.c = t1b.a;
 
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 
1	SIMPLE	t1b	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 
1	SIMPLE	t1a	ref|filter	c,b	c|b	116|2	test.t1b.a	1 (67%)	66.67	Using where; Using rowid filter
 
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1	100.00	Using where; Using join buffer (flat, BNL join)
 
Warnings:
 
Note	1003	select `test`.`t1a`.`a` AS `a`,`test`.`t1a`.`pk` AS `pk`,`test`.`t1a`.`b` AS `b`,`test`.`t1a`.`c` AS `c` from `test`.`t1` `t1a` join `test`.`t1` `t1b` left join `test`.`t2` on(`test`.`t2`.`f` = `test`.`t1b`.`a`) where `test`.`t1a`.`b` >= 0 and `test`.`t1a`.`c` = `test`.`t1b`.`a`
 
DROP TABLE t1, t2;

11.0+

explain extended
 
SELECT t1a.* FROM t1 AS t1a JOIN t1 AS t1b LEFT JOIN t2  ON (f = t1b.a) WHERE t1a.b >= 0 AND t1a.c = t1b.a;
 
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 
1	SIMPLE	t1b	ALL	NULL	NULL	NULL	NULL	3	100.00	
1	SIMPLE	t1a	range	c,b	b	2	NULL	2	33.33	Using index condition; Using where; Using join buffer (flat, BNL join)
 
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1	100.00	Using where; Using join buffer (incremental, BNL join)
 
Warnings:
 
Note	1003	select `test`.`t1a`.`a` AS `a`,`test`.`t1a`.`pk` AS `pk`,`test`.`t1a`.`b` AS `b`,`test`.`t1a`.`c` AS `c` from `test`.`t1` `t1a` join `test`.`t1` `t1b` left join `test`.`t2` on(`test`.`t2`.`f` = `test`.`t1b`.`a`) where `test`.`t1a`.`b` >= 0 and `test`.`t1a`.`c` = `test`.`t1b`.`a`

Please check also MDEV-33259 - there also the crash on non-debug build

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