bk commit into 5.0 tree (ramil:1.2504) BUG#28652

[ramil]

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5.0 repository of ram. When ram does a push these changes will
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ChangeSet@stripped, 2007-05-29 16:35:58+05:00, ramil@stripped +3 -0
  Fix for bug #28652: MySQL (with-debug=full) asserts when alter table operations
  
  Problem: we may create a deadlock committing changes in the mysql_alter_table() when 
  LOCK_open is set.
  Fix: unlock LOCK_open before commit to avoid possible deadlocks.

  mysql-test/r/innodb_mysql.result@stripped, 2007-05-29 16:35:57+05:00, ramil@stripped +8 -0
    Fix for bug #28652: MySQL (with-debug=full) asserts when alter table operations
      - test result.

  mysql-test/t/innodb_mysql.test@stripped, 2007-05-29 16:35:57+05:00, ramil@stripped +8 -0
    Fix for bug #28652: MySQL (with-debug=full) asserts when alter table operations
      - test case.

  sql/sql_table.cc@stripped, 2007-05-29 16:35:57+05:00, ramil@stripped +7 -3
    Fix for bug #28652: MySQL (with-debug=full) asserts when alter table operations
      - unlock LOCK_open before commit to avoid possible deadlock.

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	ramil
# Host:	ramil.myoffice.izhnet.ru
# Root:	/home/ram/work/b28652/b28652.5.0

--- 1.343/sql/sql_table.cc	2007-05-29 16:36:02 +05:00
+++ 1.344/sql/sql_table.cc	2007-05-29 16:36:02 +05:00
@@ -3946,7 +3946,13 @@ view_err:
       goto err;
     }
   }
-  /* The ALTER TABLE is always in its own transaction */
+  /*
+    The ALTER TABLE is always in its own transaction.
+    We must unlock LOCK_open before the commit as it may create a deadlock 
+    in the wait_if_global_read_lock() if called with LOCK_open.
+  */
+  broadcast_refresh(); 
+  VOID(pthread_mutex_unlock(&LOCK_open));
   error = ha_commit_stmt(thd);
   if (ha_commit(thd))
     error=1;
@@ -3963,8 +3969,6 @@ view_err:
     Query_log_event qinfo(thd, thd->query, thd->query_length, FALSE, FALSE);
     mysql_bin_log.write(&qinfo);
   }
-  broadcast_refresh();
-  VOID(pthread_mutex_unlock(&LOCK_open));
 #ifdef HAVE_BERKELEY_DB
   if (old_db_type == DB_TYPE_BERKELEY_DB)
   {

--- 1.21/mysql-test/r/innodb_mysql.result	2007-05-29 16:36:02 +05:00
+++ 1.22/mysql-test/r/innodb_mysql.result	2007-05-29 16:36:02 +05:00
@@ -617,4 +617,12 @@ EXPLAIN SELECT COUNT(*) FROM t2 WHERE st
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	range	idx1,idx2	idx1	9	NULL	2	Using where; Using index
 DROP TABLE t1,t2;
+create table t1(a int) engine=innodb;
+alter table t1 comment '123';
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(11) default NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='123'
+drop table t1;
 End of 5.0 tests

--- 1.21/mysql-test/t/innodb_mysql.test	2007-05-29 16:36:02 +05:00
+++ 1.22/mysql-test/t/innodb_mysql.test	2007-05-29 16:36:02 +05:00
@@ -597,4 +597,12 @@ EXPLAIN SELECT COUNT(*) FROM t2 WHERE st
 
 DROP TABLE t1,t2; 
 
+#
+# Bug #28652: assert when alter innodb table operation
+#
+create table t1(a int) engine=innodb;
+alter table t1 comment '123';
+show create table t1;
+drop table t1;
+
 --echo End of 5.0 tests