diff -r 1a4335135ffd -r 5165b3a5b44a hotspot/src/share/vm/gc/g1/g1ParScanThreadState.inline.hpp
--- a/hotspot/src/share/vm/gc/g1/g1ParScanThreadState.inline.hpp	Fri Jul 07 23:53:36 2017 +0200
+++ b/hotspot/src/share/vm/gc/g1/g1ParScanThreadState.inline.hpp	Mon Jul 10 10:10:49 2017 +0200
@@ -51,11 +51,13 @@
     _g1h->set_humongous_is_live(obj);
   } else {
     assert(in_cset_state.is_default() || in_cset_state.is_ext(),
-           "In_cset_state must be NotInCSet or Ext here, but is " CSETSTATE_FORMAT, in_cset_state.value());
+         "In_cset_state must be NotInCSet or Ext here, but is " CSETSTATE_FORMAT, in_cset_state.value());
   }
 
   assert(obj != NULL, "Must be");
-  update_rs(from, p, obj);
+  if (!HeapRegion::is_in_same_region(p, obj)) {
+    update_rs(from, p, obj);
+  }
 }
 
 template <class T> inline void G1ParScanThreadState::push_on_queue(T* ref) {