bzr commit into mysql-5.1-bugteam branch (Dmitry.Shulga:3502) Bug#56619

[Dmitry Shulga]

#At file:///Users/shulga/projects/mysql/5.1-bugteam-bug56619/ based on revid:dmitry.shulga@stripped

 3502 Dmitry Shulga	2010-11-10
      Fixed bug#56619 - Assertion failed during
      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.

    modified:
      mysql-test/suite/innodb/r/innodb_mysql.result
      mysql-test/suite/innodb/t/innodb_mysql.test
      sql/sql_table.cc
=== modified file 'mysql-test/suite/innodb/r/innodb_mysql.result'
--- a/mysql-test/suite/innodb/r/innodb_mysql.result	2010-10-05 08:11:56 +0000
+++ b/mysql-test/suite/innodb/r/innodb_mysql.result	2010-11-10 08:32:42 +0000
@@ -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;

=== modified file 'mysql-test/suite/innodb/t/innodb_mysql.test'
--- a/mysql-test/suite/innodb/t/innodb_mysql.test	2010-10-05 08:11:56 +0000
+++ b/mysql-test/suite/innodb/t/innodb_mysql.test	2010-11-10 08:32:42 +0000
@@ -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

=== modified file 'sql/sql_table.cc'
--- a/sql/sql_table.cc	2010-10-19 10:27:09 +0000
+++ b/sql/sql_table.cc	2010-11-10 08:32:42 +0000
@@ -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)
     {


Attachment: [text/bzr-bundle] bzr/[e-mail]