--- old/src/share/classes/java/lang/ref/ReferenceQueue.java	2013-06-19 13:10:09.392217543 +0200
+++ new/src/share/classes/java/lang/ref/ReferenceQueue.java	2013-06-19 13:10:09.292217544 +0200
@@ -58,6 +58,13 @@
         synchronized (r) {
             if (r.queue == ENQUEUED) return false;
             synchronized (lock) {
+                // There is a race between this method and the polling: it may occur
+                // that one thread just successfully removed a Reference from the queue,
+                // making it inactive, and another thread calling this method on this
+                // queue with the same Reference instance. Filter out those attempts.
+                if (r.queue != this) {
+                    return false;
+                }
                 r.queue = ENQUEUED;
                 r.next = (head == null) ? r : head;
                 head = r;
--- /dev/null	2013-06-19 08:52:55.996443996 +0200
+++ new/test/java/lang/ref/EnqueuePollRace.java	2013-06-19 13:10:09.696217540 +0200
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2013, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/* @test
+ * @bug 8014890
+ * @summary Verify that a race between ReferenceQueue.enqueue() and poll() does not occur.
+ * @author thomas.schatzl@oracle.com
+ */
+
+import java.lang.ref.*;
+
+public class EnqueuePollRace {
+
+    public static void main(String args[]) throws Exception {
+        new WeakRef().run();
+        System.out.println("Test passed.");
+    }
+
+    static class WeakRef {
+        ReferenceQueue<Object> queue = new ReferenceQueue<Object>();
+        final int numReferences = 100;
+        final Reference refs[] = new Reference[numReferences];
+        final int iterations = 1000;
+
+        void run() throws InterruptedException {
+            for (int i = 0; i < iterations; i++) {
+                queue = new ReferenceQueue<Object>();
+
+                for (int j = 0; j < refs.length; j++) {
+                    refs[j] = new WeakReference(new Object(), queue);
+                }
+
+                System.gc(); // enqueues references into the list of discovered references
+
+                // now manually enqueue all of them
+                for (int j = 0; j < refs.length; j++) {
+                    refs[j].enqueue();
+                }
+                // and get them back. There should be exactly numReferences
+                // entries in the queue now.
+                int foundReferences = 0;
+                while (queue.poll() != null) {
+                    foundReferences++;
+                }
+
+                if (foundReferences != refs.length) {
+                    throw new RuntimeException("Got " + foundReferences + " references in the queue, but expected " + refs.length);
+                }
+            }
+        }
+    }
+}