--- a/src/hotspot/share/gc/parallel/psParallelCompact.cpp	Mon Oct 23 03:15:19 2017 -0400
+++ b/src/hotspot/share/gc/parallel/psParallelCompact.cpp	Mon Oct 23 11:20:53 2017 +0200
@@ -2119,14 +2119,14 @@
     pt.print_all_references();
   }
 
+  // This is the point where the entire marking should have completed.
+  assert(cm->marking_stacks_empty(), "Marking should have completed");
+
   {
     GCTraceTime(Debug, gc, phases) tm("Weak Processing", &_gc_timer);
-    WeakProcessor::weak_oops_do(is_alive_closure(), &mark_and_push_closure, &follow_stack_closure);
+    WeakProcessor::weak_oops_do(is_alive_closure(), &do_nothing_cl);
   }
 
-  // This is the point where the entire marking should have completed.
-  assert(cm->marking_stacks_empty(), "Marking should have completed");
-
   {
     GCTraceTime(Debug, gc, phases) tm_m("Class Unloading", &_gc_timer);