--- a/test/jdk/java/util/concurrent/tck/JSR166TestCase.java	Tue Oct 03 13:50:09 2017 -0700
+++ b/test/jdk/java/util/concurrent/tck/JSR166TestCase.java	Tue Oct 03 13:55:05 2017 -0700
@@ -571,6 +571,7 @@
                 "DoubleAdderTest",
                 "ForkJoinPool8Test",
                 "ForkJoinTask8Test",
+                "HashMapTest",
                 "LinkedBlockingDeque8Test",
                 "LinkedBlockingQueue8Test",
                 "LongAccumulatorTest",
@@ -1940,6 +1941,18 @@
         Collections.shuffle(Arrays.asList(array), ThreadLocalRandom.current());
     }
 
+    /**
+     * Returns the same String as would be returned by {@link
+     * Object#toString}, whether or not the given object's class
+     * overrides toString().
+     *
+     * @see System#identityHashCode
+     */
+    static String identityString(Object x) {
+        return x.getClass().getName()
+            + "@" + Integer.toHexString(System.identityHashCode(x));
+    }
+
     // --- Shared assertions for Executor tests ---
 
     /**