perfschema.stage_mdl_table failed in buildbot

perfschema.stage_mdl_table               w2 [ fail ]

        Test ended at 2017-04-04 06:31:55

CURRENT_TEST: perfschema.stage_mdl_table

--- /usr/share/mysql/mysql-test/suite/perfschema/r/stage_mdl_table.result	2017-04-04 04:55:16.000000000 +0000

+++ /run/shm/var/2/log/stage_mdl_table.reject	2017-04-04 06:31:55.497355527 +0000

@@ -27,7 +27,7 @@

 username	event_name	sql_text

 user2	statement/sql/alter_table	alter table test.t1 add column (b int)

 username	event_name	nesting_event_type

-user2	stage/sql/Waiting for table metadata lock	STATEMENT

+user2	stage/sql/After create	STATEMENT

 username	event_name	nesting_event_type

 user2	stage/sql/init	STATEMENT

 user2	stage/sql/checking permissions	STATEMENT

mysqltest: Result length mismatch