--- old/src/hotspot/share/memory/universe.cpp	2019-11-21 11:54:16.648047348 +0100
+++ new/src/hotspot/share/memory/universe.cpp	2019-11-21 11:54:16.396043086 +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