multi_source.gtid fails sporadically in buildbot

multi_source.gtid 'xtradb'               w3 [ fail ]

        Test ended at 2016-07-01 03:01:12

CURRENT_TEST: multi_source.gtid

--- /var/lib/buildbot/maria-slave/p8-trusty-bintar/build/mysql-test/suite/multi_source/gtid.result	2016-06-30 18:38:40.329974188 -0400

+++ /var/lib/buildbot/maria-slave/p8-trusty-bintar/build/mysql-test/suite/multi_source/gtid.reject	2016-07-01 03:01:11.994300928 -0400

@@ -77,6 +77,11 @@

 connection slave1;

 CHANGE MASTER TO master_port=MYPORT_4, master_host='127.0.0.1', master_user='root', master_use_gtid=current_pos;

 START SLAVE;

+Timeout in wait_condition.inc for SELECT (SELECT COUNT(*) FROM t1)=3 AND (SELECT COUNT(*) FROM t2)=4 AND (SELECT COUNT(*) FROM t3)=7

+Id	User	Host	db	Command	Time	State	Info	Progress

+4	root	localhost:35841	test	Query	0	init	show full processlist	0.000

+10	system user		NULL	Connect	41	Waiting for master to send event	NULL	0.000

+11	system user		NULL	Connect	40	Unlocking tables	NULL	0.000

 SELECT * FROM t1 ORDER BY a;

 a	b

 1	initial

@@ -87,16 +92,13 @@

 1	initial

 2	switch1

 3	switch 2

-4	switch 3

 SELECT * FROM t3 ORDER BY a;

 a	b

 101	initial 1

 102	switch1 a

-103	switch 2 a

 201	initial 2

 202	switch1 b

 203	switch 2 b

-204	switch 3 b

 connection master1;

 DROP TABLE t1;

 SET SQL_LOG_BIN=0;

# logs not available

# 0.0	1f761c5615c7414d1ccd88ceb7027202	p8-trusty-bintar	2016-06-22 04:38:18	1082	nm	Normal run, no --ps-protocol	multi_source.gtid	xtradb

multi_source.gtid 'xtradb'               w4 [ fail ]

        Test ended at 2016-06-21 21:51:20

CURRENT_TEST: multi_source.gtid

--- /var/lib/buildbot/maria-slave/p8-trusty-bintar/build/mysql-test/suite/multi_source/gtid.result	2016-06-20 22:05:49.582216586 -0400

+++ /var/lib/buildbot/maria-slave/p8-trusty-bintar/build/mysql-test/suite/multi_source/gtid.reject	2016-06-21 21:51:19.400341815 -0400

@@ -83,6 +83,11 @@

 DROP TABLE t2;

 DROP TABLE t3;

 SET GLOBAL gtid_domain_id=0;

+Timeout in wait_condition.inc for SELECT COUNT(*)=0 FROM information_schema.tables WHERE table_name IN ("t1", "t2", "t3") AND table_schema = "test"

+Id	User	Host	db	Command	Time	State	Info	Progress

+4	root	localhost:46772	test	Query	0	init	show full processlist	0.000

+10	system user		NULL	Connect	41	Waiting for master to send event	NULL	0.000

+11	system user		test	Connect	37	closing tables	DROP TABLE IF EXISTS `t3` /* generated by server */	0.000

 STOP ALL SLAVES;

 Warnings:

 Note	1938	SLAVE '' stopped

mysqltest: Result length mismatch