--- old/test/java/lang/ThreadGroup/Stop.java	2016-07-04 14:53:59.000000000 +0800
+++ new/test/java/lang/ThreadGroup/Stop.java	2016-07-04 14:53:58.000000000 +0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2016, 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
@@ -29,7 +29,7 @@
  */
 
 public class Stop implements Runnable {
-    private static boolean groupStopped = false ;
+    private static volatile boolean groupStopped = false ;
     private static final Object lock = new Object();
 
     private static final ThreadGroup group = new ThreadGroup("");
@@ -70,7 +70,7 @@
             while (!groupStopped) {
                 lock.wait();
                 // Give the other thread a chance to stop
-                Thread.sleep(1000);
+                Thread.sleep(5000);
             }
         }