--- a/hotspot/src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp	Thu Jan 20 13:57:12 2011 -0800
+++ b/hotspot/src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp	Fri Jan 21 11:30:22 2011 -0500
@@ -251,7 +251,9 @@
 
         // Now do the remainder of the cleanup operation.
         _cm->completeCleanup();
+        _sts.join();
         g1_policy->record_concurrent_mark_cleanup_completed();
+        _sts.leave();
 
         double cleanup_end_sec = os::elapsedTime();
         if (PrintGC) {