Under load rpl.sec_behind_master-5114 'stmt' fails with seconds_behind_master mismatch

rpl.sec_behind_master-5114 'stmt' w3 [ fail ]
Test ended at 2015-07-28 08:41:12

CURRENT_TEST: rpl.sec_behind_master-5114
— /var/lib/jenkins/workspace/mariadb-10.1/mysql-test/suite/rpl/r/sec_behind_master-5114.result 2015-06-03 13:25:21.157409877 +1000
+++ /var/lib/jenkins/workspace/mariadb-10.1/mysql-test/suite/rpl/r/sec_behind_master-5114.reject 2015-07-28 08:41:10.950099036 +1000
@@ -3,7 +3,7 @@
call mtr.add_suppression("Unsafe statement written to the binary log");
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES(SLEEP(2));
-Seconds_Behind_Master: 1
+Seconds_Behind_Master: 5
Warnings:
Note 1592 Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT. Statement is unsafe because it uses a system function that may return a different value on the slave.
drop table t1;

mysqltest: Result content mismatch

At the time, the VM doing this build+test was rather loaded, as likely was the machine the KVM guest was on. This is likely due to load more than anything else, but the test should handle that