sys_vars.thread_cache_size_func fails sporadically

@@ -25,4 +25,7 @@

 connection default;

 disconnect conn1;

 disconnect conn2;

+Timeout in wait_condition.inc for SELECT variable_value = 1 FROM INFORMATION_SCHEMA.global_status where variable_name="Threads_cached"

+Id	User	Host	db	Command	Time	State	Info	Progress

+4	root	localhost	test	Query	0	starting	show full processlist	0.000

 SET @@GLOBAL.thread_cache_size = @global_thread_cache_size;

@@ -13,7 +13,7 @@

 connection default;

 SHOW STATUS LIKE 'Threads_cached';

 Variable_name	Value

-Threads_cached	0

+Threads_cached	1

 0 Expected

 disconnect conn1;

 disconnect conn2;