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Fixed bug#56619 - Assertion failed during

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ALTER TABLE RENAME, DISABLE KEYS.

The code of ALTER TABLE RENAME, DISABLE KEYS could
issue a commit while holding LOCK_open mutex.
This is a regression introduced by the fix for
Bug 54453.
This failed an assert guarding us against a potential
deadlock with connections trying to execute
FLUSH TABLES WITH READ LOCK.

The fix is to move acquisition of LOCK_open outside
the section that issues ha_autocommit_or_rollback().
LOCK_open is taken to protect against concurrent
operations with .frms and the table definition
cache, and doesn't need to cover the call to commit.

A test case added to innodb_mysql.test.

The patch is to be null-merged to 5.5, which
already has 54453 null-merged to it.

mysql-test/suite/innodb/r/innodb_mysql.result:
  Added test results for test for bug#56619.
mysql-test/suite/innodb/t/innodb_mysql.test:
  Added test for bug#56619.
sql/sql_table.cc:
  mysql_alter_table() modified: moved acquisition of LOCK_open
  after call to ha_autocommit_or_rollback.
This commit is contained in:
Dmitry Shulga 2010-11-10 14:32:42 +06:00
parent 2c16c7e985
commit 4b0fe88708
3 changed files with 24 additions and 1 deletions
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8
mysql-test/suite/innodb/r/innodb_mysql.result
View File

@ -2620,3 +2620,11 @@ t2 CREATE TABLE `t2` (
CONSTRAINT `x` FOREIGN KEY (`fk`) REFERENCES `t1` (`pk`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t2, t1;
#
# Test for bug #56619 - Assertion failed during
# ALTER TABLE RENAME, DISABLE KEYS
#
DROP TABLE IF EXISTS t1, t2;
CREATE TABLE t1 (a INT, INDEX(a)) engine=innodb;
ALTER TABLE t1 RENAME TO t2, DISABLE KEYS;
DROP TABLE IF EXISTS t1, t2;

13
mysql-test/suite/innodb/t/innodb_mysql.test
View File

@ -845,3 +845,16 @@ create table t2 (fk int, key x (fk),
constraint x foreign key (FK) references t1 (PK)) engine=InnoDB;
show create table t2;
drop table t2, t1;
--echo #
--echo # Test for bug #56619 - Assertion failed during
--echo # ALTER TABLE RENAME, DISABLE KEYS
--echo #
--disable_warnings
DROP TABLE IF EXISTS t1, t2;
--enable_warnings
CREATE TABLE t1 (a INT, INDEX(a)) engine=innodb;
--disable_warnings
ALTER TABLE t1 RENAME TO t2, DISABLE KEYS;
DROP TABLE IF EXISTS t1, t2;
--enable_warnings

4
sql/sql_table.cc
View File

@ -6832,7 +6832,6 @@ view_err:
table->alias);
}
VOID(pthread_mutex_lock(&LOCK_open));
/*
Unlike to the above case close_cached_table() below will remove ALL
instances of TABLE from table cache (it will also remove table lock
@ -6853,6 +6852,7 @@ view_err:
*/
ha_autocommit_or_rollback(thd, 0);
VOID(pthread_mutex_lock(&LOCK_open));
/*
Then do a 'simple' rename of the table. First we need to close all
instances of 'source' table.
@ -6885,6 +6885,8 @@ view_err:
}
}
}
else
VOID(pthread_mutex_lock(&LOCK_open));
if (error == HA_ERR_WRONG_COMMAND)
{