--- a/src/hotspot/share/memory/universe.cpp	Mon Nov 25 12:32:07 2019 +0100
+++ b/src/hotspot/share/memory/universe.cpp	Mon Nov 25 12:32:40 2019 +0100
@@ -511,7 +511,7 @@
 
 oop Universe::swap_reference_pending_list(oop list) {
   assert_pll_locked(is_locked);
-  return Atomic::xchg(list, &_reference_pending_list);
+  return Atomic::xchg(&_reference_pending_list, list);
 }
 
 #undef assert_pll_locked