diff -r 6d5c7f91e0b5 -r 15f4471787b9 src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp	Mon Oct 21 21:36:26 2019 +0100
+++ b/src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp	Mon Oct 21 22:44:48 2019 +0200
@@ -186,7 +186,7 @@
 
     // Step 1: Process ordinary GC roots.
     {
-      ShenandoahTraversalClosure roots_cl(q, rp);
+      ShenandoahTraversalRootsClosure roots_cl(q, rp);
       ShenandoahMarkCLDClosure cld_cl(&roots_cl);
       MarkingCodeBlobClosure code_cl(&roots_cl, CodeBlobToOopClosure::FixRelocations);
       if (unload_classes) {
@@ -266,7 +266,7 @@
     // in similar way during nmethod-register process. Therefore, we don't need to rescan code
     // roots here.
     if (!_heap->is_degenerated_gc_in_progress()) {
-      ShenandoahTraversalClosure roots_cl(q, rp);
+      ShenandoahTraversalRootsClosure roots_cl(q, rp);
       ShenandoahTraversalSATBThreadsClosure tc(&satb_cl);
       if (unload_classes) {
         ShenandoahRemarkCLDClosure remark_cld_cl(&roots_cl);
@@ -767,7 +767,7 @@
 
   template <class T>
   inline void do_oop_work(T* p) {
-    _traversal_gc->process_oop<T, false /* string dedup */, false /* degen */>(p, _thread, _queue, _mark_context);
+    _traversal_gc->process_oop<T, false /* string dedup */, false /* degen */, true /* atomic update */>(p, _thread, _queue, _mark_context);
   }
 
 public:
@@ -789,7 +789,7 @@
 
   template <class T>
   inline void do_oop_work(T* p) {
-    _traversal_gc->process_oop<T, false /* string dedup */, true /* degen */>(p, _thread, _queue, _mark_context);
+    _traversal_gc->process_oop<T, false /* string dedup */, true /* degen */, false /* atomic update */>(p, _thread, _queue, _mark_context);
   }
 
 public:
@@ -812,7 +812,7 @@
   template <class T>
   inline void do_oop_work(T* p) {
     ShenandoahEvacOOMScope evac_scope;
-    _traversal_gc->process_oop<T, false /* string dedup */, false /* degen */>(p, _thread, _queue, _mark_context);
+    _traversal_gc->process_oop<T, false /* string dedup */, false /* degen */, true /* atomic update */>(p, _thread, _queue, _mark_context);
   }
 
 public:
@@ -835,7 +835,7 @@
   template <class T>
   inline void do_oop_work(T* p) {
     ShenandoahEvacOOMScope evac_scope;
-    _traversal_gc->process_oop<T, false /* string dedup */, true /* degen */>(p, _thread, _queue, _mark_context);
+    _traversal_gc->process_oop<T, false /* string dedup */, true /* degen */, false /* atomic update */>(p, _thread, _queue, _mark_context);
   }
 
 public: