perfschema.threads_mysql failed in buildbot (type=BACKGROUND mismatch)

perfschema.threads_mysql                 w1 [ fail ]

        Test ended at 2017-10-31 16:42:55

CURRENT_TEST: perfschema.threads_mysql

--- /usr/local/mariadb-10.1.29-linux-x86_64/mysql-test/suite/perfschema/r/threads_mysql.result	2017-10-31 13:50:57.000000000 +0200

+++ /usr/local/mariadb-10.1.29-linux-x86_64/mysql-test/suite/perfschema/r/threads_mysql.reject	2017-10-31 16:42:55.019538132 +0200

@@ -68,11 +68,11 @@

   AND thread_id NOT IN (SELECT thread_id FROM t1)

 ORDER BY name;

 name	thread/sql/event_scheduler

-type	FOREGROUND

+type	BACKGROUND

 processlist_user	root

 processlist_host	localhost

 processlist_db	NULL

-processlist_command	Sleep

+processlist_command	NULL

 processlist_info	NULL

 unified_parent_thread_id	unified parent_thread_id

 role	NULL

mysqltest: Result length mismatch