--- old/src/share/vm/gc/g1/g1CollectedHeap.cpp	2017-06-12 16:18:30.263226229 -0700
+++ new/src/share/vm/gc/g1/g1CollectedHeap.cpp	2017-06-12 16:18:30.139226233 -0700
@@ -1283,7 +1283,7 @@
 
       // Enqueue any discovered reference objects that have
       // not been removed from the discovered lists.
-      ref_processor_stw()->enqueue_discovered_references();
+      ref_processor_stw()->enqueue_discovered_references(NULL, gc_timer);
 
 #if defined(COMPILER2) || INCLUDE_JVMCI
       DerivedPointerTable::update_pointers();
@@ -4421,7 +4421,7 @@
   // the pending list.
   if (!rp->processing_is_mt()) {
     // Serial reference processing...
-    rp->enqueue_discovered_references();
+    rp->enqueue_discovered_references(NULL, _gc_timer_stw);
   } else {
     // Parallel reference enqueueing