--- old/src/hotspot/share/gc/g1/g1OopClosures.inline.hpp	2019-09-19 12:24:50.621053623 +0200
+++ new/src/hotspot/share/gc/g1/g1OopClosures.inline.hpp	2019-09-19 12:24:50.310043490 +0200
@@ -38,6 +38,7 @@
 #include "oops/oopsHierarchy.hpp"
 #include "oops/oop.inline.hpp"
 #include "runtime/prefetch.inline.hpp"
+#include "utilities/align.hpp"
 
 template <class T>
 inline void G1ScanClosureBase::prefetch_and_push(T* p, const oop obj) {
@@ -115,7 +116,8 @@
   G1CollectedHeap* g1h = G1CollectedHeap::heap();
   // can't do because of races
   // assert(oopDesc::is_oop_or_null(obj), "expected an oop");
-  g1h->check_oop_location(obj);
+  assert(is_object_aligned(obj), "oop must be aligned");
+  assert(g1h->is_in_reserved(obj), "oop must be in reserved");
 
   HeapRegion* from = g1h->heap_region_containing(p);