--- old/src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp	2011-09-14 14:54:23.591700613 -0700
+++ new/src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp	2011-09-14 14:54:23.363303611 -0700
@@ -198,10 +198,9 @@
 
     allocate_stacks();
 
-    NOT_PRODUCT(ref_processor()->verify_no_references_recorded());
     COMPILER2_PRESENT(DerivedPointerTable::clear());
 
-    ref_processor()->enable_discovery();
+    ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/);
     ref_processor()->setup_policy(clear_all_softrefs);
 
     mark_sweep_phase1(clear_all_softrefs);