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Bug #42419: Server crash with "Pure virtual method called" on two concurrent

connections
The problem is that tables can enter open table cache for a thread without 
being properly cleaned up. This can happen if make_join_statistics() fails 
to read a const table because of e.g. a deadlock. It does set a member of 
TABLE structure to a value it allocates, but doesn't clean-up this setting 
on error nor does it set the rest of the members in JOIN to allow for 
automatic cleanup.
As a result when such an error occurs and the next statement depends re-uses 
the table from the open tables cache it will get it with this 
TABLE::reginfo.join_tab pointing to a memory area that's freed.
Fixed by making sure make_join_statistics() cleans up TABLE::reginfo.join_tab 
on error.

mysql-test/r/innodb_mysql.result:
  Bug #42419: test case
mysql-test/t/innodb_mysql-master.opt:
  Bug #42419: increase the timeout so it covers te conservative 
  sleep 3 in the test
mysql-test/t/innodb_mysql.test:
  Bug #42419: test case
sql/sql_select.cc:
  Bug #42419: clean up the members of TABLE on failure in 
          make_join_statisitcs()
This commit is contained in:
Georgi Kodinov
2009-02-19 17:30:03 +02:00
parent 5d0054012d
commit 29476d879f
4 changed files with 92 additions and 13 deletions

View File

@ -1267,4 +1267,20 @@ CREATE INDEX i1 on t1 (a(3));
SELECT * FROM t1 WHERE a = 'abcde';
a
DROP TABLE t1;
CREATE TABLE t1 (a INT NOT NULL AUTO_INCREMENT PRIMARY KEY, b INT)
ENGINE=InnoDB;
INSERT INTO t1 VALUES (1,1),(2,2),(3,3);
SET AUTOCOMMIT = 0;
CREATE TEMPORARY TABLE t1_tmp (b INT);
INSERT INTO t1_tmp SELECT b FROM t1 WHERE a = 3;
INSERT INTO t1_tmp SELECT b FROM t1 WHERE a = 2;
SET AUTOCOMMIT = 0;
CREATE TEMPORARY TABLE t2_tmp ( a INT, new_a INT);
INSERT INTO t2_tmp VALUES (1,51),(2,52),(3,53);
UPDATE t1 SET a = (SELECT new_a FROM t2_tmp WHERE t2_tmp.a = t1.a) WHERE a = 1;
UPDATE t1 SET a = (SELECT new_a FROM t2_tmp WHERE t2_tmp.a = t1.a) WHERE a = 2;
INSERT INTO t1_tmp SELECT b FROM t1 WHERE a = 1;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
UPDATE t1 SET a = (SELECT new_a FROM t2_tmp WHERE t2_tmp.a = t1.a) WHERE a = 3;
DROP TABLE t1;
End of 5.0 tests