--- old/src/share/vm/services/mallocSiteTable.cpp	2015-02-09 11:39:11.491616000 -0500
+++ new/src/share/vm/services/mallocSiteTable.cpp	2015-02-09 11:39:11.077035000 -0500
@@ -136,7 +136,7 @@
 MallocSite* MallocSiteTable::lookup_or_add(const NativeCallStack& key, size_t* bucket_idx,
   size_t* pos_idx) {
   int index = hash_to_index(key.hash());
-  assert(index >= 0, "Negative index");
+  assert(index >= 0, err_msg("Negative index %d", index));
   *bucket_idx = (size_t)index;
   *pos_idx = 0;