diff -r fa357420e7d2 -r 6aa7255741f3 src/share/vm/classfile/javaClasses.cpp
--- a/src/share/vm/classfile/javaClasses.cpp	Tue Nov 24 15:19:30 2009 -0800
+++ b/src/share/vm/classfile/javaClasses.cpp	Thu Dec 03 15:01:57 2009 -0800
@@ -1124,8 +1124,7 @@
     if (_dirty && _methods != NULL) {
       BarrierSet* bs = Universe::heap()->barrier_set();
       assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");
-      bs->write_ref_array(MemRegion((HeapWord*)_methods->base(),
-                                    _methods->array_size()));
+      bs->write_ref_array((HeapWord*)_methods->base(), _methods->length());
       _dirty = false;
     }
   }