diff -r b354ffb03ae4 -r 13c02cc7a6e5 src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp	Thu Apr 04 12:29:43 2019 -0700
+++ b/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp	Thu Apr 04 21:29:46 2019 +0200
@@ -1795,13 +1795,13 @@
 
 void ShenandoahHeap::stop_concurrent_marking() {
   assert(is_concurrent_mark_in_progress(), "How else could we get here?");
+  set_concurrent_mark_in_progress(false);
   if (!cancelled_gc()) {
     // If we needed to update refs, and concurrent marking has been cancelled,
     // we need to finish updating references.
     set_has_forwarded_objects(false);
     mark_complete_marking_context();
   }
-  set_concurrent_mark_in_progress(false);
 }
 
 void ShenandoahHeap::force_satb_flush_all_threads() {
@@ -1831,12 +1831,16 @@
 }
 
 void ShenandoahHeap::set_concurrent_mark_in_progress(bool in_progress) {
-  set_gc_state_mask(MARKING, in_progress);
+  if (has_forwarded_objects()) {
+    set_gc_state_mask(MARKING | UPDATEREFS, in_progress);
+  } else {
+    set_gc_state_mask(MARKING, in_progress);
+  }
   ShenandoahBarrierSet::satb_mark_queue_set().set_active_all_threads(in_progress, !in_progress);
 }
 
 void ShenandoahHeap::set_concurrent_traversal_in_progress(bool in_progress) {
-   set_gc_state_mask(TRAVERSAL | HAS_FORWARDED, in_progress);
+   set_gc_state_mask(TRAVERSAL | HAS_FORWARDED | UPDATEREFS, in_progress);
    ShenandoahBarrierSet::satb_mark_queue_set().set_active_all_threads(in_progress, !in_progress);
 }