diff --git a/internal/querynode/mock_tsafe_replica_test.go b/internal/querynode/mock_tsafe_replica_test.go
new file mode 100644
index 0000000000..64c2e70737
--- /dev/null
+++ b/internal/querynode/mock_tsafe_replica_test.go
@@ -0,0 +1,248 @@
+// Code generated by mockery v2.14.0. DO NOT EDIT.
+
+package querynode
+
+import mock "github.com/stretchr/testify/mock"
+
+// MockTSafeReplicaInterface is an autogenerated mock type for the TSafeReplicaInterface type
+type MockTSafeReplicaInterface struct {
+	mock.Mock
+}
+
+type MockTSafeReplicaInterface_Expecter struct {
+	mock *mock.Mock
+}
+
+func (_m *MockTSafeReplicaInterface) EXPECT() *MockTSafeReplicaInterface_Expecter {
+	return &MockTSafeReplicaInterface_Expecter{mock: &_m.Mock}
+}
+
+// Watch provides a mock function with given fields:
+func (_m *MockTSafeReplicaInterface) Watch() Listener {
+	ret := _m.Called()
+
+	var r0 Listener
+	if rf, ok := ret.Get(0).(func() Listener); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(Listener)
+		}
+	}
+
+	return r0
+}
+
+// MockTSafeReplicaInterface_Watch_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'Watch'
+type MockTSafeReplicaInterface_Watch_Call struct {
+	*mock.Call
+}
+
+// Watch is a helper method to define mock.On call
+func (_e *MockTSafeReplicaInterface_Expecter) Watch() *MockTSafeReplicaInterface_Watch_Call {
+	return &MockTSafeReplicaInterface_Watch_Call{Call: _e.mock.On("Watch")}
+}
+
+func (_c *MockTSafeReplicaInterface_Watch_Call) Run(run func()) *MockTSafeReplicaInterface_Watch_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run()
+	})
+	return _c
+}
+
+func (_c *MockTSafeReplicaInterface_Watch_Call) Return(_a0 Listener) *MockTSafeReplicaInterface_Watch_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+// WatchChannel provides a mock function with given fields: channel
+func (_m *MockTSafeReplicaInterface) WatchChannel(channel string) Listener {
+	ret := _m.Called(channel)
+
+	var r0 Listener
+	if rf, ok := ret.Get(0).(func(string) Listener); ok {
+		r0 = rf(channel)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(Listener)
+		}
+	}
+
+	return r0
+}
+
+// MockTSafeReplicaInterface_WatchChannel_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'WatchChannel'
+type MockTSafeReplicaInterface_WatchChannel_Call struct {
+	*mock.Call
+}
+
+// WatchChannel is a helper method to define mock.On call
+//  - channel string
+func (_e *MockTSafeReplicaInterface_Expecter) WatchChannel(channel interface{}) *MockTSafeReplicaInterface_WatchChannel_Call {
+	return &MockTSafeReplicaInterface_WatchChannel_Call{Call: _e.mock.On("WatchChannel", channel)}
+}
+
+func (_c *MockTSafeReplicaInterface_WatchChannel_Call) Run(run func(channel string)) *MockTSafeReplicaInterface_WatchChannel_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(string))
+	})
+	return _c
+}
+
+func (_c *MockTSafeReplicaInterface_WatchChannel_Call) Return(_a0 Listener) *MockTSafeReplicaInterface_WatchChannel_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+// addTSafe provides a mock function with given fields: vChannel
+func (_m *MockTSafeReplicaInterface) addTSafe(vChannel string) {
+	_m.Called(vChannel)
+}
+
+// MockTSafeReplicaInterface_addTSafe_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'addTSafe'
+type MockTSafeReplicaInterface_addTSafe_Call struct {
+	*mock.Call
+}
+
+// addTSafe is a helper method to define mock.On call
+//  - vChannel string
+func (_e *MockTSafeReplicaInterface_Expecter) addTSafe(vChannel interface{}) *MockTSafeReplicaInterface_addTSafe_Call {
+	return &MockTSafeReplicaInterface_addTSafe_Call{Call: _e.mock.On("addTSafe", vChannel)}
+}
+
+func (_c *MockTSafeReplicaInterface_addTSafe_Call) Run(run func(vChannel string)) *MockTSafeReplicaInterface_addTSafe_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(string))
+	})
+	return _c
+}
+
+func (_c *MockTSafeReplicaInterface_addTSafe_Call) Return() *MockTSafeReplicaInterface_addTSafe_Call {
+	_c.Call.Return()
+	return _c
+}
+
+// getTSafe provides a mock function with given fields: vChannel
+func (_m *MockTSafeReplicaInterface) getTSafe(vChannel string) (uint64, error) {
+	ret := _m.Called(vChannel)
+
+	var r0 uint64
+	if rf, ok := ret.Get(0).(func(string) uint64); ok {
+		r0 = rf(vChannel)
+	} else {
+		r0 = ret.Get(0).(uint64)
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(string) error); ok {
+		r1 = rf(vChannel)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// MockTSafeReplicaInterface_getTSafe_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'getTSafe'
+type MockTSafeReplicaInterface_getTSafe_Call struct {
+	*mock.Call
+}
+
+// getTSafe is a helper method to define mock.On call
+//  - vChannel string
+func (_e *MockTSafeReplicaInterface_Expecter) getTSafe(vChannel interface{}) *MockTSafeReplicaInterface_getTSafe_Call {
+	return &MockTSafeReplicaInterface_getTSafe_Call{Call: _e.mock.On("getTSafe", vChannel)}
+}
+
+func (_c *MockTSafeReplicaInterface_getTSafe_Call) Run(run func(vChannel string)) *MockTSafeReplicaInterface_getTSafe_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(string))
+	})
+	return _c
+}
+
+func (_c *MockTSafeReplicaInterface_getTSafe_Call) Return(_a0 uint64, _a1 error) *MockTSafeReplicaInterface_getTSafe_Call {
+	_c.Call.Return(_a0, _a1)
+	return _c
+}
+
+// removeTSafe provides a mock function with given fields: vChannel
+func (_m *MockTSafeReplicaInterface) removeTSafe(vChannel string) {
+	_m.Called(vChannel)
+}
+
+// MockTSafeReplicaInterface_removeTSafe_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'removeTSafe'
+type MockTSafeReplicaInterface_removeTSafe_Call struct {
+	*mock.Call
+}
+
+// removeTSafe is a helper method to define mock.On call
+//  - vChannel string
+func (_e *MockTSafeReplicaInterface_Expecter) removeTSafe(vChannel interface{}) *MockTSafeReplicaInterface_removeTSafe_Call {
+	return &MockTSafeReplicaInterface_removeTSafe_Call{Call: _e.mock.On("removeTSafe", vChannel)}
+}
+
+func (_c *MockTSafeReplicaInterface_removeTSafe_Call) Run(run func(vChannel string)) *MockTSafeReplicaInterface_removeTSafe_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(string))
+	})
+	return _c
+}
+
+func (_c *MockTSafeReplicaInterface_removeTSafe_Call) Return() *MockTSafeReplicaInterface_removeTSafe_Call {
+	_c.Call.Return()
+	return _c
+}
+
+// setTSafe provides a mock function with given fields: vChannel, timestamp
+func (_m *MockTSafeReplicaInterface) setTSafe(vChannel string, timestamp uint64) error {
+	ret := _m.Called(vChannel, timestamp)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(string, uint64) error); ok {
+		r0 = rf(vChannel, timestamp)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// MockTSafeReplicaInterface_setTSafe_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'setTSafe'
+type MockTSafeReplicaInterface_setTSafe_Call struct {
+	*mock.Call
+}
+
+// setTSafe is a helper method to define mock.On call
+//  - vChannel string
+//  - timestamp uint64
+func (_e *MockTSafeReplicaInterface_Expecter) setTSafe(vChannel interface{}, timestamp interface{}) *MockTSafeReplicaInterface_setTSafe_Call {
+	return &MockTSafeReplicaInterface_setTSafe_Call{Call: _e.mock.On("setTSafe", vChannel, timestamp)}
+}
+
+func (_c *MockTSafeReplicaInterface_setTSafe_Call) Run(run func(vChannel string, timestamp uint64)) *MockTSafeReplicaInterface_setTSafe_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(string), args[1].(uint64))
+	})
+	return _c
+}
+
+func (_c *MockTSafeReplicaInterface_setTSafe_Call) Return(_a0 error) *MockTSafeReplicaInterface_setTSafe_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+type mockConstructorTestingTNewMockTSafeReplicaInterface interface {
+	mock.TestingT
+	Cleanup(func())
+}
+
+// NewMockTSafeReplicaInterface creates a new instance of MockTSafeReplicaInterface. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
+func NewMockTSafeReplicaInterface(t mockConstructorTestingTNewMockTSafeReplicaInterface) *MockTSafeReplicaInterface {
+	mock := &MockTSafeReplicaInterface{}
+	mock.Mock.Test(t)
+
+	t.Cleanup(func() { mock.AssertExpectations(t) })
+
+	return mock
+}
diff --git a/internal/querynode/shard_cluster.go b/internal/querynode/shard_cluster.go
index 140070121a..c1490a765f 100644
--- a/internal/querynode/shard_cluster.go
+++ b/internal/querynode/shard_cluster.go
@@ -1049,11 +1049,10 @@ func (sc *ShardCluster) Search(ctx context.Context, req *querypb.SearchRequest,
 		resultMut.Lock()
 		defer resultMut.Unlock()
 		if streamErr != nil {
-			cancel()
-			// not set cancel error
-			if !errors.Is(streamErr, context.Canceled) {
+			if err == nil {
 				err = fmt.Errorf("stream operation failed: %w", streamErr)
 			}
+			cancel()
 		}
 	}()
 
@@ -1077,11 +1076,10 @@ func (sc *ShardCluster) Search(ctx context.Context, req *querypb.SearchRequest,
 			resultMut.Lock()
 			defer resultMut.Unlock()
 			if nodeErr != nil || partialResult.GetStatus().GetErrorCode() != commonpb.ErrorCode_Success {
-				cancel()
-				// not set cancel error
-				if !errors.Is(nodeErr, context.Canceled) {
+				if err == nil {
 					err = fmt.Errorf("Search %d failed, reason %s err %w", node.nodeID, partialResult.GetStatus().GetReason(), nodeErr)
 				}
+				cancel()
 				return
 			}
 			results = append(results, partialResult)
@@ -1128,11 +1126,10 @@ func (sc *ShardCluster) Query(ctx context.Context, req *querypb.QueryRequest, wi
 
 		streamErr := withStreaming(reqCtx)
 		if streamErr != nil {
-			cancel()
-			// not set cancel error
-			if !errors.Is(streamErr, context.Canceled) {
+			if err == nil {
 				err = fmt.Errorf("stream operation failed: %w", streamErr)
 			}
+			cancel()
 		}
 	}()
 
@@ -1156,8 +1153,8 @@ func (sc *ShardCluster) Query(ctx context.Context, req *querypb.QueryRequest, wi
 			resultMut.Lock()
 			defer resultMut.Unlock()
 			if nodeErr != nil || partialResult.GetStatus().GetErrorCode() != commonpb.ErrorCode_Success {
-				cancel()
 				err = fmt.Errorf("Query %d failed, reason %s err %w", node.nodeID, partialResult.GetStatus().GetReason(), nodeErr)
+				cancel()
 				return
 			}
 			results = append(results, partialResult)
diff --git a/internal/querynode/task_read.go b/internal/querynode/task_read.go
index 23ca034f60..d485ee8e12 100644
--- a/internal/querynode/task_read.go
+++ b/internal/querynode/task_read.go
@@ -41,6 +41,7 @@ type readTask interface {
 	CanMergeWith(readTask) bool
 	CPUUsage() int32
 	Timeout() bool
+	TimeoutError() error
 
 	SetMaxCPUUsage(int32)
 	SetStep(step TaskStep)
@@ -133,12 +134,16 @@ func (b *baseReadTask) Timeout() bool {
 	return !funcutil.CheckCtxValid(b.Ctx())
 }
 
+func (b *baseReadTask) TimeoutError() error {
+	return b.ctx.Err()
+}
+
 func (b *baseReadTask) Ready() (bool, error) {
 	if b.waitTSafeTr == nil {
 		b.waitTSafeTr = timerecord.NewTimeRecorder("waitTSafeTimeRecorder")
 	}
 	if b.Timeout() {
-		return false, fmt.Errorf("deadline exceed")
+		return false, b.TimeoutError()
 	}
 	var channel Channel
 	if b.DataScope == querypb.DataScope_Streaming {
diff --git a/internal/querynode/task_read_test.go b/internal/querynode/task_read_test.go
new file mode 100644
index 0000000000..72ade4777b
--- /dev/null
+++ b/internal/querynode/task_read_test.go
@@ -0,0 +1,115 @@
+package querynode
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/milvus-io/milvus/internal/mocks"
+	"github.com/milvus-io/milvus/internal/util/timerecord"
+	"github.com/stretchr/testify/suite"
+)
+
+type baseReadTaskSuite struct {
+	suite.Suite
+
+	qs    *queryShard
+	tsafe *MockTSafeReplicaInterface
+
+	task *baseReadTask
+}
+
+func (s *baseReadTaskSuite) SetupSuite() {
+	meta := newMockReplicaInterface()
+	meta.getCollectionByIDFunc = func(collectionID UniqueID) (*Collection, error) {
+		return &Collection{
+			id: defaultCollectionID,
+		}, nil
+	}
+	rcm := &mocks.ChunkManager{}
+	lcm := &mocks.ChunkManager{}
+
+	tsafe := &MockTSafeReplicaInterface{}
+
+	qs, err := newQueryShard(context.Background(), defaultCollectionID, defaultDMLChannel, defaultReplicaID, nil, meta, tsafe, lcm, rcm, false)
+	s.Require().NoError(err)
+
+	s.qs = qs
+}
+
+func (s *baseReadTaskSuite) TearDownSuite() {
+	s.qs.Close()
+}
+
+func (s *baseReadTaskSuite) SetupTest() {
+	s.task = &baseReadTask{QS: s.qs, tr: timerecord.NewTimeRecorder("baseReadTaskTest")}
+}
+
+func (s *baseReadTaskSuite) TearDownTest() {
+	s.task = nil
+}
+
+func (s *baseReadTaskSuite) TestPreExecute() {
+	ctx := context.Background()
+	err := s.task.PreExecute(ctx)
+	s.Assert().NoError(err)
+	s.Assert().Equal(TaskStepPreExecute, s.task.step)
+}
+
+func (s *baseReadTaskSuite) TestExecute() {
+	ctx := context.Background()
+	err := s.task.Execute(ctx)
+	s.Assert().NoError(err)
+	s.Assert().Equal(TaskStepExecute, s.task.step)
+}
+
+func (s *baseReadTaskSuite) TestTimeout() {
+	s.Run("background ctx", func() {
+		s.task.ctx = context.Background()
+		s.Assert().False(s.task.Timeout())
+	})
+
+	s.Run("context canceled", func() {
+		ctx, cancel := context.WithCancel(context.Background())
+		cancel()
+		s.task.ctx = ctx
+
+		s.Assert().True(s.task.Timeout())
+	})
+
+	s.Run("deadline exceeded", func() {
+		ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(-1*time.Minute))
+		defer cancel()
+		s.task.ctx = ctx
+
+		s.Assert().True(s.task.Timeout())
+	})
+}
+
+func (s *baseReadTaskSuite) TestTimeoutError() {
+	s.Run("background ctx", func() {
+		s.task.ctx = context.Background()
+		s.Assert().Nil(s.task.TimeoutError())
+	})
+
+	s.Run("context canceled", func() {
+		ctx, cancel := context.WithCancel(context.Background())
+		cancel()
+		s.task.ctx = ctx
+
+		s.Assert().ErrorIs(s.task.TimeoutError(), context.Canceled)
+	})
+
+	s.Run("deadline exceeded", func() {
+		ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(-1*time.Minute))
+		defer cancel()
+		s.task.ctx = ctx
+
+		s.Assert().ErrorIs(s.task.TimeoutError(), context.DeadlineExceeded)
+	})
+
+}
+
+func TestBaseReadTask(t *testing.T) {
+	suite.Run(t, new(baseReadTaskSuite))
+}
diff --git a/internal/querynode/task_scheduler.go b/internal/querynode/task_scheduler.go
index 7aafe60600..96a2036532 100644
--- a/internal/querynode/task_scheduler.go
+++ b/internal/querynode/task_scheduler.go
@@ -146,7 +146,6 @@ func (s *taskScheduler) tryEvictUnsolvedReadTask(headCount int) {
 	if diff <= 0 {
 		return
 	}
-	timeoutErr := fmt.Errorf("deadline exceed")
 	var next *list.Element
 	for e := s.unsolvedReadTasks.Front(); e != nil; e = next {
 		next = e.Next()
@@ -160,7 +159,7 @@ func (s *taskScheduler) tryEvictUnsolvedReadTask(headCount int) {
 		if t.Timeout() {
 			s.unsolvedReadTasks.Remove(e)
 			rateCol.rtCounter.sub(t, unsolvedQueueType)
-			t.Notify(timeoutErr)
+			t.Notify(t.TimeoutError())
 			diff--
 		}
 	}
@@ -188,7 +187,7 @@ func (s *taskScheduler) scheduleReadTasks() {
 	for {
 		select {
 		case <-s.ctx.Done():
-			log.Warn("QueryNode sop schedulerReadTasks")
+			log.Warn("QueryNode stop schedulerReadTasks")
 			return
 
 		case <-s.notifyChan:
@@ -273,12 +272,11 @@ func (s *taskScheduler) executeReadTasks() {
 	defer s.wg.Done()
 	var taskWg sync.WaitGroup
 	defer taskWg.Wait()
-	timeoutErr := fmt.Errorf("deadline exceed")
 
 	executeFunc := func(t readTask) {
 		defer taskWg.Done()
 		if t.Timeout() {
-			t.Notify(timeoutErr)
+			t.Notify(t.TimeoutError())
 		} else {
 			s.processReadTask(t)
 		}
@@ -302,6 +300,7 @@ func (s *taskScheduler) executeReadTasks() {
 				pendingTaskLen := len(s.executeReadTaskChan)
 				taskWg.Add(1)
 				atomic.AddInt32(&s.readConcurrency, int32(pendingTaskLen+1))
+				log.Debug("begin to execute task")
 				go executeFunc(t)
 
 				for i := 0; i < pendingTaskLen; i++ {
diff --git a/internal/querynode/task_scheduler_test.go b/internal/querynode/task_scheduler_test.go
index 50ae6fdb7d..411219a41d 100644
--- a/internal/querynode/task_scheduler_test.go
+++ b/internal/querynode/task_scheduler_test.go
@@ -20,6 +20,8 @@ import (
 	"context"
 	"errors"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 type mockTask struct {
@@ -65,6 +67,7 @@ type mockReadTask struct {
 	ready        bool
 	canMerge     bool
 	timeout      bool
+	timeoutError error
 	step         TaskStep
 	readyError   error
 }
@@ -89,6 +92,10 @@ func (m *mockReadTask) Timeout() bool {
 	return m.timeout
 }
 
+func (m *mockReadTask) TimeoutError() error {
+	return m.timeoutError
+}
+
 func (m *mockReadTask) SetMaxCPUUsage(cpu int32) {
 	m.maxCPU = cpu
 }
@@ -125,3 +132,80 @@ func TestTaskScheduler(t *testing.T) {
 
 	ts.Close()
 }
+
+func TestTaskScheduler_tryEvictUnsolvedReadTask(t *testing.T) {
+	t.Run("evict canceled task", func(t *testing.T) {
+		ctx, cancel := context.WithCancel(context.Background())
+		cancel()
+		tSafe := newTSafeReplica()
+
+		ts := newTaskScheduler(ctx, tSafe)
+
+		taskCanceled := &mockReadTask{
+			mockTask: mockTask{
+				baseTask: baseTask{
+					ctx:  ctx,
+					done: make(chan error, 1024),
+				},
+			},
+			timeout:      true,
+			timeoutError: context.Canceled,
+		}
+		taskNormal := &mockReadTask{
+			mockTask: mockTask{
+				baseTask: baseTask{
+					ctx:  context.Background(),
+					done: make(chan error, 1024),
+				},
+			},
+		}
+
+		ts.unsolvedReadTasks.PushBack(taskNormal)
+		ts.unsolvedReadTasks.PushBack(taskCanceled)
+
+		// set max len to 2
+		tmp := Params.QueryNodeCfg.MaxUnsolvedQueueSize
+		Params.QueryNodeCfg.MaxUnsolvedQueueSize = 2
+		ts.tryEvictUnsolvedReadTask(1)
+		Params.QueryNodeCfg.MaxUnsolvedQueueSize = tmp
+
+		err := <-taskCanceled.done
+		assert.ErrorIs(t, err, context.Canceled)
+
+		select {
+		case <-taskNormal.done:
+			t.Fail()
+		default:
+		}
+
+		assert.Equal(t, 1, ts.unsolvedReadTasks.Len())
+	})
+}
+
+func TestTaskScheduler_executeReadTasks(t *testing.T) {
+	t.Run("execute canceled task", func(t *testing.T) {
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+		tSafe := newTSafeReplica()
+
+		ts := newTaskScheduler(ctx, tSafe)
+		ts.Start()
+		defer ts.Close()
+
+		taskCanceled := &mockReadTask{
+			mockTask: mockTask{
+				baseTask: baseTask{
+					ctx:  ctx,
+					done: make(chan error, 1024),
+				},
+			},
+			timeout:      true,
+			timeoutError: context.Canceled,
+		}
+
+		ts.executeReadTaskChan <- taskCanceled
+
+		err := <-taskCanceled.done
+		assert.ErrorIs(t, err, context.Canceled)
+	})
+}