--- old/src/share/vm/gc/g1/g1ConcurrentMark.inline.hpp	2017-07-14 16:23:39.898224014 +0200
+++ new/src/share/vm/gc/g1/g1ConcurrentMark.inline.hpp	2017-07-14 16:23:39.797220935 +0200
@@ -204,21 +204,10 @@
 
 inline void G1CMTask::deal_with_reference(oop obj) {
   increment_refs_reached();
-
-  HeapWord* objAddr = (HeapWord*) obj;
-  assert(obj->is_oop_or_null(true /* ignore mark word */), "Expected an oop or NULL at " PTR_FORMAT, p2i(obj));
-  if (_g1h->is_in_g1_reserved(objAddr)) {
-    assert(obj != NULL, "null check is implicit");
-    if (!_nextMarkBitMap->is_marked(objAddr)) {
-      // Only get the containing region if the object is not marked on the
-      // bitmap (otherwise, it's a waste of time since we won't do
-      // anything with it).
-      HeapRegion* hr = _g1h->heap_region_containing(obj);
-      if (!hr->obj_allocated_since_next_marking(obj)) {
-        make_reference_grey(obj);
-      }
-    }
+  if (obj == NULL) {
+    return;
   }
+  make_reference_grey(obj);
 }
 
 inline void G1ConcurrentMark::markPrev(oop p) {