--- old/src/hotspot/share/gc/g1/g1ParScanThreadState.cpp	2018-10-25 11:37:41.992945578 +0200
+++ new/src/hotspot/share/gc/g1/g1ParScanThreadState.cpp	2018-10-25 11:37:41.569932545 +0200
@@ -311,8 +311,7 @@
       oop* old_p = set_partial_array_mask(old);
       do_oop_partial_array(old_p);
     } else {
-      HeapRegion* const to_region = _g1h->heap_region_containing(obj_ptr);
-      _scanner.set_region(to_region);
+      _scanner.set_scanning_in_young(dest_state.is_young());
       obj->oop_iterate_backwards(&_scanner);
     }
     return obj;
@@ -367,7 +366,7 @@
 
     _g1h->preserve_mark_during_evac_failure(_worker_id, old, m);
 
-    _scanner.set_region(r);
+    _scanner.set_scanning_in_young(r->is_young());
     old->oop_iterate_backwards(&_scanner);
 
     return old;