--- jsr166/src/test/tck/JSR166TestCase.java	2016/05/23 18:42:17	1.194
+++ jsr166/src/test/tck/JSR166TestCase.java	2016/06/04 23:49:29	1.195
@@ -979,6 +979,15 @@ public class JSR166TestCase extends Test
      * Uninteresting threads are filtered out.
      */
     static void dumpTestThreads() {
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            try {
+                System.setSecurityManager(null);
+            } catch (SecurityException giveUp) {
+                return;
+            }
+        }
+
         ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
         System.err.println("------ stacktrace dump start ------");
         for (ThreadInfo info : threadMXBean.dumpAllThreads(true, true)) {
@@ -996,6 +1005,8 @@ public class JSR166TestCase extends Test
             System.err.print(info);
         }
         System.err.println("------ stacktrace dump end ------");
+
+        if (sm != null) System.setSecurityManager(sm);
     }
 
     /**