Merge pull request #57680 from hzxuzhonghu/volume-expand

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

process pvc watch deletion event miss in expand-controller

**What this PR does / why we need it**:

volume expand controller should also process exception case when watch deletion event missed as most controllers do.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

pkg/controller/volume/expand/expand_controller.go

@@ -162,9 +162,17 @@ func (expc *expandController) Run(stopCh <-chan struct{}) {
 
 func (expc *expandController) deletePVC(obj interface{}) {
 	pvc, ok := obj.(*v1.PersistentVolumeClaim)
-
-	if pvc == nil || !ok {
-		return
+	if !ok {
+		tombstone, ok := obj.(kcache.DeletedFinalStateUnknown)
+		if !ok {
+			runtime.HandleError(fmt.Errorf("couldn't get object from tombstone %+v", obj))
+			return
+		}
+		pvc, ok = tombstone.Obj.(*v1.PersistentVolumeClaim)
+		if !ok {
+			runtime.HandleError(fmt.Errorf("tombstone contained object that is not a pvc %#v", obj))
+			return
+		}
 	}
 
 	expc.resizeMap.DeletePVC(pvc)