diff a/src/hotspot/share/gc/g1/heapRegionRemSet.inline.hpp b/src/hotspot/share/gc/g1/heapRegionRemSet.inline.hpp
--- a/src/hotspot/share/gc/g1/heapRegionRemSet.inline.hpp
+++ b/src/hotspot/share/gc/g1/heapRegionRemSet.inline.hpp
@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
@@ -71,11 +71,11 @@
   Atomic::release_store(&_hr, hr);
 }
 
 template <class Closure>
 void OtherRegionsTable::iterate(Closure& cl) {
-  if (_n_coarse_entries > 0) {
+  if (Atomic::load(&_has_coarse_entries)) {
     BitMap::idx_t cur = _coarse_map.get_next_one_offset(0);
     while (cur != _coarse_map.size()) {
       cl.next_coarse_prt((uint)cur);
       cur = _coarse_map.get_next_one_offset(cur + 1);
     }