main.kill_processlist-6619 fails sporadically in buildbot with wrong result

main.kill_processlist-6619               w3 [ fail ]

        Test ended at 2016-09-09 22:06:19

CURRENT_TEST: main.kill_processlist-6619

--- /home/buildbot/maria-slave/p8-rhel6-bintar-debug/build/mysql-test/r/kill_processlist-6619.result	2016-09-03 20:27:50.690045476 -0400

+++ /home/buildbot/maria-slave/p8-rhel6-bintar-debug/build/mysql-test/r/kill_processlist-6619.reject	2016-09-09 22:06:19.290045477 -0400

@@ -1,7 +1,7 @@

 connect  con1,localhost,root,,;

 SHOW PROCESSLIST;

 Id	User	Host	db	Command	Time	State	Info	Progress

-#	root	#	test	Sleep	#	#	NULL	0.000

+#	root	#	test	Query	#	#	select count(*) = 0 from information_schema.session_variables where variable_name = 'debug_sync' and	0.000

 #	root	#	test	Query	#	#	SHOW PROCESSLIST	0.000

 SET DEBUG_SYNC='before_execute_sql_command SIGNAL ready WAIT_FOR go';

 SHOW PROCESSLIST;

mysqltest: Result length mismatch