stop timer

staging/src/k8s.io/apiserver/pkg/admission/configuration/configuration_manager.go

@@ -104,6 +104,7 @@ func (a *poller) bootstrapping() {
 	// bootstrapGracePeriod is read-only, so no lock is required
 	timer := time.NewTimer(a.bootstrapGracePeriod)
 	go func() {
+		defer timer.Stop()
 		<-timer.C
 		a.lock.Lock()
 		defer a.lock.Unlock()

staging/src/k8s.io/apiserver/pkg/admission/configuration/configuration_manager_test.go

@@ -50,6 +50,7 @@ func TestTolerateBootstrapFailure(t *testing.T) {
 	go func() {
 		// The test might have false negative, but won't be flaky
 		timer := time.NewTimer(2 * time.Second)
+		defer timer.Stop()
 		<-timer.C
 		fakeGetSucceedLock.Lock()
 		defer fakeGetSucceedLock.Unlock()