--- a/hotspot/src/share/vm/services/memRecorder.hpp	Thu Oct 18 13:09:47 2012 -0400
+++ b/hotspot/src/share/vm/services/memRecorder.hpp	Fri Oct 19 21:40:07 2012 -0400
@@ -188,6 +188,7 @@
   // Test if the two records are the same kind: the same memory block and allocation
   // type.
   inline bool same_kind(const MemPointerRecord* p1, const MemPointerRecord* p2) const {
+    assert(!p1->is_vm_pointer() && !p2->is_vm_pointer(), "malloc pointer only");
     return (p1->addr() == p2->addr() &&
       (p1->flags() &MemPointerRecord::tag_masks) ==
       (p2->flags() & MemPointerRecord::tag_masks));