--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Thu Sep 26 10:25:02 2013 -0400
+++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Fri Sep 27 10:08:56 2013 -0400
@@ -2069,8 +2069,10 @@
   _g1_storage.initialize(g1_rs, 0);
   _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0);
   _hrs.initialize((HeapWord*) _g1_reserved.start(),
-                  (HeapWord*) _g1_reserved.end(),
-                  _expansion_regions);
+                  (HeapWord*) _g1_reserved.end());
+  assert(_hrs.max_length() == _expansion_regions,
+         err_msg("max length: %u expansion regions: %u",
+                 _hrs.max_length(), _expansion_regions));
 
   // Do later initialization work for concurrent refinement.
   _cg1r->init();