--- old/src/share/vm/gc_implementation/parallelScavenge/psPromotionLAB.hpp	2015-04-08 16:59:20.137815575 -0400
+++ new/src/share/vm/gc_implementation/parallelScavenge/psPromotionLAB.hpp	2015-04-08 16:59:20.047399878 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2015, 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
@@ -124,6 +124,7 @@
       set_top(new_top);
       assert(is_object_aligned((intptr_t)obj) && is_object_aligned((intptr_t)new_top),
              "checking alignment");
+      assert(_start_array->covered_region().contains(MemRegion(obj, size)), "Allocated beyond end of covered region");
       _start_array->allocate_block(obj);
       return obj;
     }