--- old/src/hotspot/share/gc/z/zBarrier.inline.hpp	2020-05-18 21:33:45.440213587 +0200
+++ new/src/hotspot/share/gc/z/zBarrier.inline.hpp	2020-05-18 21:33:45.185205304 +0200
@@ -228,7 +228,7 @@
 }
 
 inline oop ZBarrier::load_barrier_on_oop_field(volatile oop* p) {
-  const oop o = *p;
+  const oop o = Atomic::load(p);
   return load_barrier_on_oop_field_preloaded(p, o);
 }
 
@@ -282,7 +282,7 @@
 //
 inline oop ZBarrier::weak_load_barrier_on_oop_field(volatile oop* p) {
   assert(!ZResurrection::is_blocked(), "Should not be called during resurrection blocked phase");
-  const oop o = *p;
+  const oop o = Atomic::load(p);
   return weak_load_barrier_on_oop_field_preloaded(p, o);
 }
 
@@ -295,7 +295,7 @@
 }
 
 inline oop ZBarrier::weak_load_barrier_on_weak_oop_field(volatile oop* p) {
-  const oop o = *p;
+  const oop o = Atomic::load(p);
   return weak_load_barrier_on_weak_oop_field_preloaded(p, o);
 }
 
@@ -314,7 +314,7 @@
 }
 
 inline oop ZBarrier::weak_load_barrier_on_phantom_oop_field(volatile oop* p) {
-  const oop o = *p;
+  const oop o = Atomic::load(p);
   return weak_load_barrier_on_phantom_oop_field_preloaded(p, o);
 }
 
@@ -349,14 +349,14 @@
 inline void ZBarrier::keep_alive_barrier_on_weak_oop_field(volatile oop* p) {
   // This operation is only valid when resurrection is blocked.
   assert(ZResurrection::is_blocked(), "Invalid phase");
-  const oop o = *p;
+  const oop o = Atomic::load(p);
   barrier<is_good_or_null_fast_path, keep_alive_barrier_on_weak_oop_slow_path>(p, o);
 }
 
 inline void ZBarrier::keep_alive_barrier_on_phantom_oop_field(volatile oop* p) {
   // This operation is only valid when resurrection is blocked.
   assert(ZResurrection::is_blocked(), "Invalid phase");
-  const oop o = *p;
+  const oop o = Atomic::load(p);
   barrier<is_good_or_null_fast_path, keep_alive_barrier_on_phantom_oop_slow_path>(p, o);
 }
 
@@ -380,7 +380,7 @@
 // Mark barrier
 //
 inline void ZBarrier::mark_barrier_on_oop_field(volatile oop* p, bool finalizable) {
-  const oop o = *p;
+  const oop o = Atomic::load(p);
 
   if (finalizable) {
     barrier<is_marked_or_null_fast_path, mark_barrier_on_finalizable_oop_slow_path>(p, o);
--- old/src/hotspot/share/gc/z/zReferenceProcessor.cpp	2020-05-18 21:33:45.927229405 +0200
+++ new/src/hotspot/share/gc/z/zReferenceProcessor.cpp	2020-05-18 21:33:45.605218946 +0200
@@ -70,7 +70,7 @@
 }
 
 static oop reference_referent(oop reference) {
-  return *reference_referent_addr(reference);
+  return Atomic::load(reference_referent_addr(reference));
 }
 
 static void reference_set_referent(oop reference, oop referent) {