diff -r 61babb9fbd6f -r db6a4c28a943 hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
--- a/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Sat Mar 07 11:07:36 2009 -0500
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Sat Mar 07 11:07:37 2009 -0500
@@ -2509,7 +2509,7 @@
 
     guarantee(_in_cset_fast_test == NULL, "invariant");
     guarantee(_in_cset_fast_test_base == NULL, "invariant");
-    _in_cset_fast_test_length = n_regions();
+    _in_cset_fast_test_length = max_regions();
     _in_cset_fast_test_base =
                              NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length);
     memset(_in_cset_fast_test_base, false,