MySQL Bug#74854

Index: mysql-5.7.5-m15/sql/rpl_gtid.h
===================================================================
--- mysql-5.7.5-m15.orig/sql/rpl_gtid.h
+++ mysql-5.7.5-m15/sql/rpl_gtid.h
@@ -329,7 +329,7 @@ public:
   Checkable_rwlock()
   {
 #ifndef DBUG_OFF
-    lock_state= 0;
+    my_atomic_store32(&lock_state, 0);
 #else
     is_write_lock= false;
 #endif
@@ -423,7 +423,7 @@ private:
     -1 - write locked
     >0 - read locked by that many threads
   */
-  volatile int32 lock_state;
+  int32 lock_state;
   /// Read lock_state atomically and return the value.
   inline int32 get_state() const
   {