Fix missing of Lock in SeenAllSources

pkg/kubelet/config/config.go

@@ -95,6 +95,8 @@ func (c *PodConfig) SeenAllSources(seenSources sets.String) bool {
 	if c.pods == nil {
 		return false
 	}
+	c.sourcesLock.Lock()
+	defer c.sourcesLock.Unlock()
 	klog.V(5).InfoS("Looking for sources, have seen", "sources", c.sources.List(), "seenSources", seenSources)
 	return seenSources.HasAll(c.sources.List()...) && c.pods.seenSources(c.sources.List()...)
 }

pkg/kubelet/config/config_test.go

@@ -22,6 +22,7 @@ import (
 	"reflect"
 	"sort"
 	"strconv"
+	"sync"
 	"testing"
 	"time"
 
@@ -29,6 +30,7 @@ import (
 	apiequality "k8s.io/apimachinery/pkg/api/equality"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/client-go/kubernetes/scheme"
 	"k8s.io/client-go/tools/record"
 	kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
@@ -456,3 +458,29 @@ func TestPodUpdateLabels(t *testing.T) {
 	expectPodUpdate(t, ch, CreatePodUpdate(kubetypes.UPDATE, TestSource, pod))
 
 }
+
+func TestPodConfigRace(t *testing.T) {
+	eventBroadcaster := record.NewBroadcaster()
+	config := NewPodConfig(PodConfigNotificationIncremental, eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "kubelet"}))
+	seenSources := sets.NewString(TestSource)
+	var wg sync.WaitGroup
+	const iterations = 100
+	wg.Add(2)
+
+	go func() {
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+		defer wg.Done()
+		for i := 0; i < iterations; i++ {
+			config.Channel(ctx, strconv.Itoa(i))
+		}
+	}()
+	go func() {
+		defer wg.Done()
+		for i := 0; i < iterations; i++ {
+			config.SeenAllSources(seenSources)
+		}
+	}()
+
+	wg.Wait()
+}