fix race condition

op-node/p2p/store/scorebook.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"time"
 
+	"sync/atomic"
 	"github.com/ethereum-optimism/optimism/op-service/clock"
 	"github.com/ethereum/go-ethereum/log"
 	ds "github.com/ipfs/go-datastore"
@@ -23,11 +24,11 @@ type scoreRecord struct {
 }
 
 func (s *scoreRecord) SetLastUpdated(t time.Time) {
-	s.LastUpdate = t.Unix()
+	atomic.StoreInt64(&s.LastUpdate, t.Unix())
 }
 
 func (s *scoreRecord) LastUpdated() time.Time {
-	return time.Unix(s.LastUpdate, 0)
+	return time.Unix(0, atomic.LoadInt64(&s.LastUpdate))
 }
 
 func (s *scoreRecord) MarshalBinary() (data []byte, err error) {