--- old/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp	2011-09-14 14:54:04.922412961 -0700
+++ new/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp	2011-09-14 14:54:04.676319935 -0700
@@ -2004,7 +2004,7 @@
   ReferenceProcessorMTDiscoveryMutator rp_mut_discovery(ref_processor(), false);
 
   ref_processor()->set_enqueuing_is_done(false);
-  ref_processor()->enable_discovery();
+  ref_processor()->enable_discovery(false /*verify_disabled*/, false /*check_no_refs*/);
   ref_processor()->setup_policy(clear_all_soft_refs);
   // If an asynchronous collection finishes, the _modUnionTable is
   // all clear.  If we are assuming the collection from an asynchronous
@@ -3490,8 +3490,8 @@
     MutexLockerEx x(bitMapLock(),
                     Mutex::_no_safepoint_check_flag);
     checkpointRootsInitialWork(asynch);
-    rp->verify_no_references_recorded();
-    rp->enable_discovery(); // enable ("weak") refs discovery
+    // enable ("weak") refs discovery
+    rp->enable_discovery(true /*verify_disabled*/, true /*check_no_refs*/);
     _collectorState = Marking;
   } else {
     // (Weak) Refs discovery: this is controlled from genCollectedHeap::do_collection
@@ -3503,7 +3503,8 @@
            "ref discovery for this generation kind");
     // already have locks
     checkpointRootsInitialWork(asynch);
-    rp->enable_discovery(); // now enable ("weak") refs discovery
+    // now enable ("weak") refs discovery
+    rp->enable_discovery(true /*verify_disabled*/, false /*verify_no_refs*/);
     _collectorState = Marking;
   }
   SpecializationStats::print();