--- old/src/share/vm/runtime/java.cpp	Wed Feb 18 09:38:18 2015
+++ new/src/share/vm/runtime/java.cpp	Wed Feb 18 09:38:18 2015
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -422,9 +422,11 @@
     os::infinite_sleep();
   }
 
-  // Terminate watcher thread - must before disenrolling any periodic task
-  if (PeriodicTask::num_tasks() > 0)
+  // Stop the WatcherThread. We do this before disenrolling various
+  // PeriodicTasks to reduce the likelihood of races.
+  if (PeriodicTask::num_tasks() > 0) {
     WatcherThread::stop();
+  }
 
   // Print statistics gathered (profiling ...)
   if (Arguments::has_profile()) {