--- old/src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.inline.hpp	2020-03-11 20:43:31.467420220 +0100
+++ new/src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.inline.hpp	2020-03-11 20:43:31.359420226 +0100
@@ -294,6 +294,7 @@
 template <class T>
 void ShenandoahBarrierSet::arraycopy_pre_work(T* src, T* dst, size_t count) {
   if (_heap->is_concurrent_mark_in_progress()) {
+    if (_heap->marking_context()->allocated_after_mark_start((HeapWord*)dst)) return;
     if (_heap->has_forwarded_objects()) {
       arraycopy_work<T, true, false, true>(dst, count);
     } else {
@@ -301,7 +302,9 @@
     }
   }
 
-  arraycopy_update_impl(src, count);
+  if (_heap->has_forwarded_objects()) {
+    arraycopy_update_impl(src, count);
+  }
 }
 
 void ShenandoahBarrierSet::arraycopy_pre(oop* src, oop* dst, size_t count) {
@@ -312,8 +315,13 @@
   arraycopy_pre_work(src, dst, count);
 }
 
+inline bool ShenandoahBarrierSet::skip_bulk_update(HeapWord* dst) {
+  return dst >= _heap->heap_region_containing(dst)->get_update_watermark();
+}
+
 template <class T>
 void ShenandoahBarrierSet::arraycopy_update_impl(T* src, size_t count) {
+  if (skip_bulk_update(reinterpret_cast<HeapWord*>(src))) return;
   if (_heap->is_evacuation_in_progress()) {
     ShenandoahEvacOOMScope oom_evac;
     arraycopy_work<T, true, true, false>(src, count);