perfschema.global_read_lock fails in buildbot

perfschema.global_read_lock              w3 [ fail ]

        Test ended at 2014-11-23 03:31:21

CURRENT_TEST: perfschema.global_read_lock

--- /usr/share/mysql/mysql-test/suite/perfschema/r/global_read_lock.result	2014-11-22 23:33:32.000000000 +0200

+++ /run/shm/var/3/log/global_read_lock.reject	2014-11-23 03:31:21.547093061 +0200

@@ -18,13 +18,16 @@

 unlock tables;

 lock tables performance_schema.setup_instruments write;

 connection default;

+Timeout in wait_condition.inc for select 1 from performance_schema.events_waits_current where event_name like "wait/synch/cond/sql/MDL_context::COND_wait_status"

+Id	User	Host	db	Command	Time	State	Info	Progress

+12470	root	localhost	performance_schema	Query	0	init	show full processlist	0.000

+12471	pfsuser	localhost	test	Query	30	Waiting for global read lock	lock tables performance_schema.setup_instruments write	0.000

 select event_name,

 left(source, locate(":", source)) as short_source,

 timer_end, timer_wait, operation

 from performance_schema.events_waits_current

 where event_name like "wait/synch/cond/sql/MDL_context::COND_wait_status";

 event_name	short_source	timer_end	timer_wait	operation

-wait/synch/cond/sql/MDL_context::COND_wait_status	mdl.cc:	NULL	NULL	timed_wait

 unlock tables;

 update performance_schema.setup_instruments set enabled='NO';

 update performance_schema.setup_instruments set enabled='YES';

mysqltest: Result length mismatch