--- old/src/hotspot/share/gc/g1/heapRegionRemSet.cpp	2019-11-21 11:57:16.875093778 +0100
+++ new/src/hotspot/share/gc/g1/heapRegionRemSet.cpp	2019-11-21 11:57:16.395085668 +0100
@@ -46,7 +46,7 @@
   PerRegionTable* fl = _free_list;
   while (fl != NULL) {
     PerRegionTable* nxt = fl->next();
-    PerRegionTable* res = Atomic::cmpxchg(nxt, &_free_list, fl);
+    PerRegionTable* res = Atomic::cmpxchg(&_free_list, fl, nxt);
     if (res == fl) {
       fl->init(hr, true);
       return fl;