--- a/src/hotspot/share/gc/shared/satbMarkQueue.cpp	Thu Apr 25 05:54:54 2019 -0700
+++ b/src/hotspot/share/gc/shared/satbMarkQueue.cpp	Thu Apr 25 10:56:31 2019 -0400
@@ -172,7 +172,7 @@
 #endif // ASSERT
   // Update the global state, synchronized with threads list management.
   {
-    MutexLockerEx ml(NonJavaThreadsList_lock, Mutex::_no_safepoint_check_flag);
+    MutexLocker ml(NonJavaThreadsList_lock, Mutex::_no_safepoint_check_flag);
     _all_active = active;
   }