diff --git a/integration_tests/store_test.go b/integration_tests/store_test.go
index 44b737a9..8aa7b1aa 100644
--- a/integration_tests/store_test.go
+++ b/integration_tests/store_test.go
@@ -118,6 +118,9 @@ type checkRequestClient struct {
 
 func (c *checkRequestClient) SendRequest(ctx context.Context, addr string, req *tikvrpc.Request, timeout time.Duration) (*tikvrpc.Response, error) {
 	resp, err := c.Client.SendRequest(ctx, addr, req, timeout)
+	if err != nil {
+		return resp, err
+	}
 	if c.priority != req.Priority {
 		if resp.Resp != nil {
 			if getResp, ok := resp.Resp.(*kvrpcpb.GetResponse); ok {
diff --git a/internal/locate/region_request3_test.go b/internal/locate/region_request3_test.go
index 79e40141..319bddc2 100644
--- a/internal/locate/region_request3_test.go
+++ b/internal/locate/region_request3_test.go
@@ -314,7 +314,7 @@ func (s *testRegionRequestToThreeStoresSuite) TestLearnerReplicaSelector() {
 	region = &Region{
 		meta: region.GetMeta(),
 	}
-	region.lastAccess = time.Now().Unix()
+	atomic.StoreInt64(&region.lastAccess, time.Now().Unix())
 	region.meta.Peers = append(region.meta.Peers, tikvLearner)
 	atomic.StorePointer(&region.store, unsafe.Pointer(regionStore))
 
@@ -325,7 +325,7 @@ func (s *testRegionRequestToThreeStoresSuite) TestLearnerReplicaSelector() {
 	cache.mu.Unlock()
 
 	// Test accessFollower state with kv.ReplicaReadLearner request type.
-	region.lastAccess = time.Now().Unix()
+	atomic.StoreInt64(&region.lastAccess, time.Now().Unix())
 	refreshEpochs(regionStore)
 	req.ReplicaReadType = kv.ReplicaReadLearner
 	replicaSelector, err := newReplicaSelector(cache, regionLoc.Region, req)
@@ -334,7 +334,7 @@ func (s *testRegionRequestToThreeStoresSuite) TestLearnerReplicaSelector() {
 
 	accessLearner, _ := replicaSelector.state.(*accessFollower)
 	// Invalidate the region if the leader is not in the region.
-	region.lastAccess = time.Now().Unix()
+	atomic.StoreInt64(&region.lastAccess, time.Now().Unix())
 	rpcCtx, err := replicaSelector.next(s.bo)
 	s.Nil(err)
 	// Should swith to the next follower.
@@ -365,7 +365,7 @@ func (s *testRegionRequestToThreeStoresSuite) TestReplicaSelector() {
 	region = &Region{
 		meta: region.GetMeta(),
 	}
-	region.lastAccess = time.Now().Unix()
+	atomic.StoreInt64(&region.lastAccess, time.Now().Unix())
 	region.meta.Peers = append(region.meta.Peers, tiflash)
 	atomic.StorePointer(&region.store, unsafe.Pointer(regionStore))
 
@@ -429,7 +429,7 @@ func (s *testRegionRequestToThreeStoresSuite) TestReplicaSelector() {
 	s.False(replicaSelector.region.isValid())
 
 	// Test switching to tryFollower if leader is unreachable
-	region.lastAccess = time.Now().Unix()
+	atomic.StoreInt64(&region.lastAccess, time.Now().Unix())
 	replicaSelector, err = newReplicaSelector(cache, regionLoc.Region, req)
 	s.Nil(err)
 	s.NotNil(replicaSelector)
@@ -613,7 +613,7 @@ func (s *testRegionRequestToThreeStoresSuite) TestReplicaSelector() {
 	AssertRPCCtxEqual(s, rpcCtx, replicaSelector.replicas[regionStore.workTiKVIdx], nil)
 
 	// Test accessFollower state filtering label-not-match stores.
-	region.lastAccess = time.Now().Unix()
+	atomic.StoreInt64(&region.lastAccess, time.Now().Unix())
 	refreshEpochs(regionStore)
 	labels := []*metapb.StoreLabel{
 		{
@@ -635,7 +635,7 @@ func (s *testRegionRequestToThreeStoresSuite) TestReplicaSelector() {
 	}
 
 	// Test accessFollower state with leaderOnly option
-	region.lastAccess = time.Now().Unix()
+	atomic.StoreInt64(&region.lastAccess, time.Now().Unix())
 	refreshEpochs(regionStore)
 	for i := 0; i < 5; i++ {
 		replicaSelector, err = newReplicaSelector(cache, regionLoc.Region, req, WithLeaderOnly())
@@ -648,7 +648,7 @@ func (s *testRegionRequestToThreeStoresSuite) TestReplicaSelector() {
 	}
 
 	// Test accessFollower state with kv.ReplicaReadMixed request type.
-	region.lastAccess = time.Now().Unix()
+	atomic.StoreInt64(&region.lastAccess, time.Now().Unix())
 	refreshEpochs(regionStore)
 	req.ReplicaReadType = kv.ReplicaReadMixed
 	replicaSelector, err = newReplicaSelector(cache, regionLoc.Region, req)
@@ -656,7 +656,7 @@ func (s *testRegionRequestToThreeStoresSuite) TestReplicaSelector() {
 	s.Nil(err)
 
 	// Invalidate the region if the leader is not in the region.
-	region.lastAccess = time.Now().Unix()
+	atomic.StoreInt64(&region.lastAccess, time.Now().Unix())
 	replicaSelector.updateLeader(&metapb.Peer{Id: s.cluster.AllocID(), StoreId: s.cluster.AllocID()})
 	s.False(region.isValid())
 	// Don't try next replica if the region is invalidated.