Bug#14100113 - PERFSCHEMA.FUNC_MUTEX FAILS WITH RESULT CONTENT MISMATCH OCCASIONALLY ON PB2

Improved the robustness of the func_mutex test.

mysql-test/suite/perfschema/r/func_mutex.result

@@ -2,6 +2,15 @@ UPDATE performance_schema.setup_instruments SET enabled = 'NO', timed = 'YES';
 UPDATE performance_schema.setup_instruments SET enabled = 'YES'
 WHERE name LIKE 'wait/synch/mutex/%'
    OR name LIKE 'wait/synch/rwlock/%';
+flush status;
+select NAME from performance_schema.mutex_instances
+where NAME = 'wait/synch/mutex/sql/LOCK_open';
+NAME
+wait/synch/mutex/sql/LOCK_open
+select NAME from performance_schema.rwlock_instances
+where NAME = 'wait/synch/rwlock/sql/LOCK_grant';
+NAME
+wait/synch/rwlock/sql/LOCK_grant
 DROP TABLE IF EXISTS t1;
 CREATE TABLE t1 (id INT PRIMARY KEY, b CHAR(100) DEFAULT 'initial value')
 ENGINE=MyISAM;
@@ -112,3 +121,19 @@ test_fm2_rw_timed
 Success
 UPDATE performance_schema.setup_instruments SET enabled = 'YES';
 DROP TABLE t1;
+show status like "performance_schema%";
+Variable_name	Value
+Performance_schema_cond_classes_lost	0
+Performance_schema_cond_instances_lost	0
+Performance_schema_file_classes_lost	0
+Performance_schema_file_handles_lost	0
+Performance_schema_file_instances_lost	0
+Performance_schema_locker_lost	0
+Performance_schema_mutex_classes_lost	0
+Performance_schema_mutex_instances_lost	0
+Performance_schema_rwlock_classes_lost	0
+Performance_schema_rwlock_instances_lost	0
+Performance_schema_table_handles_lost	0
+Performance_schema_table_instances_lost	0
+Performance_schema_thread_classes_lost	0
+Performance_schema_thread_instances_lost	0

mysql-test/suite/perfschema/t/func_mutex.test

@@ -13,6 +13,15 @@ UPDATE performance_schema.setup_instruments SET enabled = 'YES'
 WHERE name LIKE 'wait/synch/mutex/%'
    OR name LIKE 'wait/synch/rwlock/%';
 
+# reset lost counters
+flush status;
+
+# Make sure objects are instrumented
+select NAME from performance_schema.mutex_instances
+  where NAME = 'wait/synch/mutex/sql/LOCK_open';
+select NAME from performance_schema.rwlock_instances
+  where NAME = 'wait/synch/rwlock/sql/LOCK_grant';
+
 --disable_warnings
 DROP TABLE IF EXISTS t1;
 --enable_warnings
@@ -116,3 +125,7 @@ SELECT IF((COALESCE(@after_count, 0) - COALESCE(@before_count, 0)) = 0, 'Success
 # Clean-up.
 UPDATE performance_schema.setup_instruments SET enabled = 'YES';
 DROP TABLE t1;
+
+# In case of failure, will indicate the root cause
+show status like "performance_schema%";
+