diff a/src/hotspot/share/gc/z/zLiveMap.inline.hpp b/src/hotspot/share/gc/z/zLiveMap.inline.hpp
--- a/src/hotspot/share/gc/z/zLiveMap.inline.hpp
+++ b/src/hotspot/share/gc/z/zLiveMap.inline.hpp
@@ -28,10 +28,11 @@
 #include "gc/z/zLiveMap.hpp"
 #include "gc/z/zMark.hpp"
 #include "gc/z/zOop.inline.hpp"
 #include "gc/z/zUtils.inline.hpp"
 #include "runtime/atomic.hpp"
+#include "runtime/orderAccess.hpp"
 #include "utilities/bitMap.inline.hpp"
 #include "utilities/debug.hpp"
 
 inline void ZLiveMap::reset() {
   _seqnum = 0;
@@ -36,11 +37,11 @@
 inline void ZLiveMap::reset() {
   _seqnum = 0;
 }
 
 inline bool ZLiveMap::is_marked() const {
-  return _seqnum == ZGlobalSeqNum;
+  return OrderAccess::load_acquire(&_seqnum) == ZGlobalSeqNum;
 }
 
 inline uint32_t ZLiveMap::live_objects() const {
   assert(ZGlobalPhase != ZPhaseMark, "Invalid phase");
   return _live_objects;
@@ -66,19 +67,19 @@
 inline BitMapView ZLiveMap::segment_claim_bits() {
   return BitMapView(&_segment_claim_bits, nsegments);
 }
 
 inline bool ZLiveMap::is_segment_live(BitMap::idx_t segment) const {
-  return segment_live_bits().at(segment);
+  return segment_live_bits().at(segment, memory_order_acquire);
 }
 
 inline bool ZLiveMap::set_segment_live_atomic(BitMap::idx_t segment) {
-  return segment_live_bits().par_set_bit(segment);
+  return segment_live_bits().par_set_bit(segment, memory_order_release);
 }
 
 inline bool ZLiveMap::claim_segment(BitMap::idx_t segment) {
-  return segment_claim_bits().par_set_bit(segment);
+  return segment_claim_bits().par_set_bit(segment, memory_order_acq_rel);
 }
 
 inline BitMap::idx_t ZLiveMap::first_live_segment() const {
   return segment_live_bits().get_next_one_offset(0, nsegments);
 }