src/java.base/share/classes/java/util/stream/StreamSpliterators.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 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
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -184,11 +184,11 @@
          */
         abstract void initPartialTraversalState();
 
         @Override
         public Spliterator<P_OUT> trySplit() {
-            if (isParallel && !finished) {
+            if (isParallel && buffer == null && !finished) {
                 init();
 
                 Spliterator<P_IN> split = spliterator.trySplit();
                 return (split == null) ? null : wrap(split);
             }