diff -r 1c280e5b8d31 -r 7994a5a35fcf src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Fri Jun 15 14:17:28 2012 -0700
+++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Mon Jun 25 16:00:55 2012 -0700
@@ -4750,9 +4750,6 @@
       _g1h->g1_policy()->record_thread_age_table(pss.age_table());
       _g1h->update_surviving_young_words(pss.surviving_young_words()+1);
 
-      // Clean up any par-expanded rem sets.
-      HeapRegionRemSet::par_cleanup();
-
       if (ParallelGCVerbose) {
         MutexLocker x(stats_lock());
         pss.print_termination_stats(worker_id);