innodb.alter_inplace_perfschema fails in buildbot with wrong result

innodb.alter_inplace_perfschema 'innodb' w3 [ fail ]

        Test ended at 2018-11-14 12:56:58

CURRENT_TEST: innodb.alter_inplace_perfschema

--- /usr/share/mysql-test/suite/innodb/r/alter_inplace_perfschema.result	2018-11-14 10:19:55.000000000 +0000

+++ /dev/shm/var/3/log/alter_inplace_perfschema.reject	2018-11-14 12:56:58.235306852 +0000

@@ -11,7 +11,6 @@

 SELECT DISTINCT object_name FROM performance_schema.events_waits_history_long

 WHERE event_name LIKE '%wait%io%file%innodb%innodb_temp_file%';

 object_name

-tmp/Innodb Merge Temp File

 SET DEBUG_SYNC = 'now SIGNAL gone';

 connection ddl;

 disconnect ddl;

mysqltest: Result length mismatch