diff --git a/client/client.go b/client/client.go
index 8838c184d92..b9535aa504e 100644
--- a/client/client.go
+++ b/client/client.go
@@ -793,7 +793,7 @@ func (c *client) GetLocalTSAsync(ctx context.Context, dcLocation string) TSFutur
 
 	req := c.getTSORequest(ctx, dcLocation)
 	if err := c.dispatchTSORequestWithRetry(req); err != nil {
-		req.done <- err
+		req.tryDone(err)
 	}
 	return req
 }
diff --git a/client/tso_batch_controller.go b/client/tso_batch_controller.go
index bd7a440fb08..5f3b08c2895 100644
--- a/client/tso_batch_controller.go
+++ b/client/tso_batch_controller.go
@@ -19,7 +19,10 @@ import (
 	"runtime/trace"
 	"time"
 
+	"github.com/pingcap/errors"
+	"github.com/pingcap/log"
 	"github.com/tikv/pd/client/tsoutil"
+	"go.uber.org/zap"
 )
 
 type tsoBatchController struct {
@@ -138,7 +141,7 @@ func (tbc *tsoBatchController) finishCollectedRequests(physical, firstLogical in
 		tsoReq := tbc.collectedRequests[i]
 		tsoReq.physical, tsoReq.logical = physical, tsoutil.AddLogical(firstLogical, int64(i), suffixBits)
 		defer trace.StartRegion(tsoReq.requestCtx, "pdclient.tsoReqDequeue").End()
-		tsoReq.done <- err
+		tsoReq.tryDone(err)
 	}
 	// Prevent the finished requests from being processed again.
 	tbc.collectedRequestCount = 0
@@ -147,6 +150,15 @@ func (tbc *tsoBatchController) finishCollectedRequests(physical, firstLogical in
 func (tbc *tsoBatchController) revokePendingRequests(err error) {
 	for i := 0; i < len(tbc.tsoRequestCh); i++ {
 		req := <-tbc.tsoRequestCh
-		req.done <- err
+		req.tryDone(err)
 	}
 }
+
+func (tbc *tsoBatchController) clear() {
+	log.Info("[pd] clear the tso batch controller",
+		zap.Int("max-batch-size", tbc.maxBatchSize), zap.Int("best-batch-size", tbc.bestBatchSize),
+		zap.Int("collected-request-count", tbc.collectedRequestCount), zap.Int("pending-request-count", len(tbc.tsoRequestCh)))
+	tsoErr := errors.WithStack(errClosing)
+	tbc.finishCollectedRequests(0, 0, 0, tsoErr)
+	tbc.revokePendingRequests(tsoErr)
+}
diff --git a/client/tso_client.go b/client/tso_client.go
index c563df0efdb..5f8b12df36f 100644
--- a/client/tso_client.go
+++ b/client/tso_client.go
@@ -21,7 +21,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/pingcap/errors"
 	"github.com/pingcap/log"
 	"github.com/tikv/pd/client/errs"
 	"go.uber.org/zap"
@@ -64,6 +63,13 @@ var tsoReqPool = sync.Pool{
 	},
 }
 
+func (req *tsoRequest) tryDone(err error) {
+	select {
+	case req.done <- err:
+	default:
+	}
+}
+
 type tsoClient struct {
 	ctx    context.Context
 	cancel context.CancelFunc
@@ -140,9 +146,8 @@ func (c *tsoClient) Close() {
 	c.tsoDispatcher.Range(func(_, dispatcherInterface any) bool {
 		if dispatcherInterface != nil {
 			dispatcher := dispatcherInterface.(*tsoDispatcher)
-			tsoErr := errors.WithStack(errClosing)
-			dispatcher.tsoBatchController.revokePendingRequests(tsoErr)
 			dispatcher.dispatcherCancel()
+			dispatcher.tsoBatchController.clear()
 		}
 		return true
 	})
diff --git a/client/tso_dispatcher.go b/client/tso_dispatcher.go
index a625f8dbbe1..88f8ffd61b5 100644
--- a/client/tso_dispatcher.go
+++ b/client/tso_dispatcher.go
@@ -95,8 +95,23 @@ func (c *tsoClient) dispatchRequest(request *tsoRequest) (bool, error) {
 		// tsoClient is closed due to the PD service mode switch, which is retryable.
 		return true, c.ctx.Err()
 	default:
+		// This failpoint will increase the possibility that the request is sent to a closed dispatcher.
+		failpoint.Inject("delayDispatchTSORequest", func() {
+			time.Sleep(time.Second)
+		})
 		dispatcher.(*tsoDispatcher).tsoBatchController.tsoRequestCh <- request
 	}
+	// Check the contexts again to make sure the request is not been sent to a closed dispatcher.
+	// Never retry on these conditions to prevent unexpected data race.
+	select {
+	case <-request.requestCtx.Done():
+		return false, request.requestCtx.Err()
+	case <-request.clientCtx.Done():
+		return false, request.clientCtx.Err()
+	case <-c.ctx.Done():
+		return false, c.ctx.Err()
+	default:
+	}
 	return false, nil
 }
 
@@ -368,6 +383,8 @@ func (c *tsoClient) handleDispatcher(
 			cc.(*tsoConnectionContext).cancel()
 			return true
 		})
+		// Clear the tso batch controller.
+		tbc.clear()
 		c.wg.Done()
 	}()
 	// Call updateTSOConnectionCtxs once to init the connectionCtxs first.
diff --git a/pkg/utils/etcdutil/etcdutil_test.go b/pkg/utils/etcdutil/etcdutil_test.go
index 4fb96895942..e02615b695f 100644
--- a/pkg/utils/etcdutil/etcdutil_test.go
+++ b/pkg/utils/etcdutil/etcdutil_test.go
@@ -239,7 +239,7 @@ func TestRandomKillEtcd(t *testing.T) {
 
 	// Randomly kill an etcd server and restart it
 	cfgs := []embed.Config{etcds[0].Config(), etcds[1].Config(), etcds[2].Config()}
-	for i := 0; i < 10; i++ {
+	for i := 0; i < len(cfgs)*2; i++ {
 		killIndex := rand.Intn(len(etcds))
 		etcds[killIndex].Close()
 		checkEtcdEndpointNum(re, client1, 2)
@@ -452,9 +452,9 @@ func (suite *loopWatcherTestSuite) TestLoadWithLimitChange() {
 	re := suite.Require()
 	re.NoError(failpoint.Enable("github.com/tikv/pd/pkg/utils/etcdutil/meetEtcdError", `return()`))
 	cache := make(map[string]struct{})
-	for i := 0; i < int(maxLoadBatchSize)*2; i++ {
+	testutil.GenerateTestDataConcurrently(int(maxLoadBatchSize)*2, func(i int) {
 		suite.put(re, fmt.Sprintf("TestLoadWithLimitChange%d", i), "")
-	}
+	})
 	watcher := NewLoopWatcher(
 		suite.ctx,
 		&suite.wg,
@@ -583,25 +583,9 @@ func (suite *loopWatcherTestSuite) TestWatcherLoadLargeKey() {
 	count := 65536
 	ctx, cancel := context.WithCancel(suite.ctx)
 	defer cancel()
-
-	// create data
-	var wg sync.WaitGroup
-	tasks := make(chan int, count)
-	for w := 0; w < 16; w++ {
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
-			for i := range tasks {
-				suite.put(re, fmt.Sprintf("TestWatcherLoadLargeKey/test-%d", i), "")
-			}
-		}()
-	}
-	for i := 0; i < count; i++ {
-		tasks <- i
-	}
-	close(tasks)
-	wg.Wait()
-
+	testutil.GenerateTestDataConcurrently(count, func(i int) {
+		suite.put(re, fmt.Sprintf("TestWatcherLoadLargeKey/test-%d", i), "")
+	})
 	cache := make([]string, 0)
 	watcher := NewLoopWatcher(
 		ctx,
diff --git a/pkg/utils/testutil/testutil.go b/pkg/utils/testutil/testutil.go
index a41fc436ca6..cef952353bc 100644
--- a/pkg/utils/testutil/testutil.go
+++ b/pkg/utils/testutil/testutil.go
@@ -16,7 +16,9 @@ package testutil
 
 import (
 	"os"
+	"runtime"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/pingcap/kvproto/pkg/pdpb"
@@ -101,3 +103,24 @@ func InitTempFileLogger(level string) (fname string) {
 	log.ReplaceGlobals(lg, p)
 	return fname
 }
+
+// GenerateTestDataConcurrently generates test data concurrently.
+func GenerateTestDataConcurrently(count int, f func(int)) {
+	var wg sync.WaitGroup
+	tasks := make(chan int, count)
+	workers := runtime.NumCPU()
+	for w := 0; w < workers; w++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for i := range tasks {
+				f(i)
+			}
+		}()
+	}
+	for i := 0; i < count; i++ {
+		tasks <- i
+	}
+	close(tasks)
+	wg.Wait()
+}
diff --git a/server/api/region_test.go b/server/api/region_test.go
index e10bfbd1af0..4198cdcb694 100644
--- a/server/api/region_test.go
+++ b/server/api/region_test.go
@@ -23,7 +23,6 @@ import (
 	"net/http"
 	"net/url"
 	"sort"
-	"sync"
 	"testing"
 	"time"
 
@@ -333,29 +332,15 @@ func TestRegionsWithKillRequest(t *testing.T) {
 	addr := svr.GetAddr()
 	url := fmt.Sprintf("%s%s/api/v1/regions", addr, apiPrefix)
 	mustBootstrapCluster(re, svr)
-	regionCount := 100000
 
-	// create data
-	var wg sync.WaitGroup
-	tasks := make(chan int, regionCount)
-	for w := 0; w < 16; w++ {
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
-			for i := range tasks {
-				r := core.NewTestRegionInfo(uint64(i+2), 1,
-					[]byte(fmt.Sprintf("%09d", i)),
-					[]byte(fmt.Sprintf("%09d", i+1)),
-					core.SetApproximateKeys(10), core.SetApproximateSize(10))
-				mustRegionHeartbeat(re, svr, r)
-			}
-		}()
-	}
-	for i := 0; i < regionCount; i++ {
-		tasks <- i
-	}
-	close(tasks)
-	wg.Wait()
+	regionCount := 100000
+	tu.GenerateTestDataConcurrently(regionCount, func(i int) {
+		r := core.NewTestRegionInfo(uint64(i+2), 1,
+			[]byte(fmt.Sprintf("%09d", i)),
+			[]byte(fmt.Sprintf("%09d", i+1)),
+			core.SetApproximateKeys(10), core.SetApproximateSize(10))
+		mustRegionHeartbeat(re, svr, r)
+	})
 
 	ctx, cancel := context.WithCancel(context.Background())
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, http.NoBody)
diff --git a/tests/integrations/tso/client_test.go b/tests/integrations/tso/client_test.go
index b0bd6f1d4e5..d4f484087cf 100644
--- a/tests/integrations/tso/client_test.go
+++ b/tests/integrations/tso/client_test.go
@@ -425,8 +425,9 @@ func (suite *tsoClientTestSuite) TestRandomShutdown() {
 	re.NoError(failpoint.Disable("github.com/tikv/pd/pkg/tso/fastUpdatePhysicalInterval"))
 }
 
-func (suite *tsoClientTestSuite) TestGetTSWhileRestingTSOClient() {
+func (suite *tsoClientTestSuite) TestGetTSWhileResettingTSOClient() {
 	re := suite.Require()
+	re.NoError(failpoint.Enable("github.com/tikv/pd/client/delayDispatchTSORequest", "return(true)"))
 	var (
 		clients    []pd.Client
 		stopSignal atomic.Bool
@@ -467,6 +468,7 @@ func (suite *tsoClientTestSuite) TestGetTSWhileRestingTSOClient() {
 	}
 	stopSignal.Store(true)
 	wg.Wait()
+	re.NoError(failpoint.Disable("github.com/tikv/pd/client/delayDispatchTSORequest"))
 }
 
 // When we upgrade the PD cluster, there may be a period of time that the old and new PDs are running at the same time.