main.show_check fails sporadically

@@ -1562,12 +1562,30 @@

 connection default;

 SHOW PROCESSLIST;

 Id	User	Host	db	Command	Time	State	Info	Progress

+###	root	###	NULL	Killed	###	###	NULL	0.000

 ###	root	###	test	Query	###	###	SHOW PROCESSLIST	0.000

+###	mysqltest_1	###	mysqltest	Killed	###	###	NULL	0.000

+###	mysqltest_2	###	NULL	Killed	###	###	NULL	0.000

+###	mysqltest_3	###	NULL	Killed	###	###	NULL	0.000

+###	mysqltest_4	###	mysqltest	Killed	###	###	NULL	0.000

+###	test_u	###	NULL	Killed	###	###	NULL	0.000

+###	root	###	test	Killed	###	###	NULL	0.000

+###	root	###	test	Killed	###	###	NULL	0.000

+###	root	###	test	Killed	###	###	NULL	0.000

 ###	root	###	test	Query	###	###	SELECT GET_LOCK('t',1000) AS 'óóóó'	0.000

 SET NAMES utf8;

 SHOW PROCESSLIST;

 Id	User	Host	db	Command	Time	State	Info	Progress

+###	root	###	NULL	Killed	###	###	NULL	0.000

 ###	root	###	test	Query	###	###	SHOW PROCESSLIST	0.000

+###	mysqltest_1	###	mysqltest	Killed	###	###	NULL	0.000

+###	mysqltest_2	###	NULL	Killed	###	###	NULL	0.000

+###	mysqltest_3	###	NULL	Killed	###	###	NULL	0.000

+###	mysqltest_4	###	mysqltest	Killed	###	###	NULL	0.000

+###	test_u	###	NULL	Killed	###	###	NULL	0.000

+###	root	###	test	Killed	###	###	NULL	0.000

+###	root	###	test	Killed	###	###	NULL	0.000

+###	root	###	test	Killed	###	###	NULL	0.000

 ###	root	###	test	Query	###	###	SELECT GET_LOCK('t',1000) AS 'óóóó'	0.000

 SELECT RELEASE_LOCK('t');

 RELEASE_LOCK('t')

diff --git a/sql/sql_connect.cc b/sql/sql_connect.cc

index c279f2663c8..c227fee943e 100644

--- a/sql/sql_connect.cc

+++ b/sql/sql_connect.cc

@@ -1483,6 +1483,7 @@ void do_handle_one_connection(CONNECT *connect, bool put_in_cache)

     if (thd->userstat_running)

       update_global_user_stats(thd, create_user, time(NULL));

+    sleep(1);

     unlink_thd(thd);

     if (IF_WSREP(thd->wsrep_applier, false) || !put_in_cache ||

         !(connect= thread_cache.park()))