kubelet: include runtime error in event on CreatePodSandbox failure

pkg/kubelet/kuberuntime/kuberuntime_manager.go

@@ -645,20 +645,20 @@ func (m *kubeGenericRuntimeManager) SyncPod(pod *v1.Pod, _ v1.PodStatus, podStat
 		if err != nil {
 			createSandboxResult.Fail(kubecontainer.ErrCreatePodSandbox, msg)
 			glog.Errorf("createPodSandbox for pod %q failed: %v", format.Pod(pod), err)
-			ref, err := ref.GetReference(legacyscheme.Scheme, pod)
-			if err != nil {
-				glog.Errorf("Couldn't make a ref to pod %q: '%v'", format.Pod(pod), err)
+			ref, referr := ref.GetReference(legacyscheme.Scheme, pod)
+			if referr != nil {
+				glog.Errorf("Couldn't make a ref to pod %q: '%v'", format.Pod(pod), referr)
 			}
-			m.recorder.Eventf(ref, v1.EventTypeWarning, events.FailedCreatePodSandBox, "Failed create pod sandbox.")
+			m.recorder.Eventf(ref, v1.EventTypeWarning, events.FailedCreatePodSandBox, "Failed create pod sandbox: %v", err)
 			return
 		}
 		glog.V(4).Infof("Created PodSandbox %q for pod %q", podSandboxID, format.Pod(pod))
 
 		podSandboxStatus, err := m.runtimeService.PodSandboxStatus(podSandboxID)
 		if err != nil {
-			ref, err := ref.GetReference(legacyscheme.Scheme, pod)
-			if err != nil {
-				glog.Errorf("Couldn't make a ref to pod %q: '%v'", format.Pod(pod), err)
+			ref, referr := ref.GetReference(legacyscheme.Scheme, pod)
+			if referr != nil {
+				glog.Errorf("Couldn't make a ref to pod %q: '%v'", format.Pod(pod), referr)
 			}
 			m.recorder.Eventf(ref, v1.EventTypeWarning, events.FailedStatusPodSandBox, "Unable to get pod sandbox status: %v", err)
 			glog.Errorf("Failed to get pod sandbox status: %v; Skipping pod %q", err, format.Pod(pod))