GetMountRefs should not fail if the path supplied does not exist anymore. It has no mount references

pkg/util/mount/mount_linux.go

@@ -1005,6 +1005,9 @@ func (mounter *Mounter) SafeMakeDir(subdir string, base string, perm os.FileMode
 }
 
 func (mounter *Mounter) GetMountRefs(pathname string) ([]string, error) {
+	if _, err := os.Stat(pathname); os.IsNotExist(err) {
+		return []string{}, nil
+	}
 	realpath, err := filepath.EvalSymlinks(pathname)
 	if err != nil {
 		return nil, err

pkg/volume/util/operationexecutor/operation_generator.go

@@ -1433,6 +1433,8 @@ func isDeviceOpened(deviceToDetach AttachedVolume, mounter mount.Interface) (boo
 		//TODO: refer to #36092
 		glog.V(3).Infof("The path isn't device path or doesn't exist. Skip checking device path: %s", deviceToDetach.DevicePath)
 		deviceOpened = false
+	} else if devicePathErr != nil {
+		return false, deviceToDetach.GenerateErrorDetailed("PathIsDevice failed", devicePathErr)
 	} else {
 		deviceOpened, deviceOpenedErr = mounter.DeviceOpened(deviceToDetach.DevicePath)
 		if deviceOpenedErr != nil {

test/e2e/storage/nfs_persistent_volume-disruptive.go

@@ -281,7 +281,7 @@ func tearDownTestCase(c clientset.Interface, f *framework.Framework, ns string,
 	// Ignore deletion errors.  Failing on them will interrupt test cleanup.
 	framework.DeletePodWithWait(f, c, client)
 	framework.DeletePersistentVolumeClaim(c, pvc.Name, ns)
-	if forceDeletePV {
+	if forceDeletePV && pv != nil {
 		framework.DeletePersistentVolume(c, pv.Name)
 		return
 	}