Merge pull request #59020 from brendandburns/kubelet-hang

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>.

Remove setInitError.

**What this PR does / why we need it**:
Removes setInitError, it's not sure it was ever really used, and it causes the kubelet to hang and get wedged.

**Which issue(s) this PR fixes** 
Fixes #46086

**Special notes for your reviewer**:
If `initializeModules()` in `kubelet.go` encounters an error, it calls `runtimeState.setInitError(...)`

47d61ef472/pkg/kubelet/kubelet.go (L1339)

The trouble with this is that `initError` is never cleared, which means that `runtimeState.runtimeErrors()` always returns this `initError`, and thus pods never start sync-ing.

In normal operation, this is expected and desired because eventually the runtime is expected to become healthy, but in this case, `initError` is never updated, and so the system just gets wedged.

47d61ef472/pkg/kubelet/kubelet.go (L1751)

We could add some retry to `initializeModules()` but that seems unnecessary, as eventually we'd want to just die anyway. Instead, just log fatal and die, a supervisor will restart us.

Note, I'm happy to add some retry here too, if that makes reviewers happier.

**Release note**:
```release-note
Prevent kubelet from getting wedged if initialization of modules returns an error.
```

@feiskyer @dchen1107 @janetkuo 

@kubernetes/sig-node-bugs

pkg/kubelet/kubelet.go

@@ -1335,8 +1335,7 @@ func (kl *Kubelet) Run(updates <-chan kubetypes.PodUpdate) {
 
 	if err := kl.initializeModules(); err != nil {
 		kl.recorder.Eventf(kl.nodeRef, v1.EventTypeWarning, events.KubeletSetupFailed, err.Error())
-		glog.Error(err)
-		kl.runtimeState.setInitError(err)
+		glog.Fatal(err)
 	}
 
 	// Start volume manager

pkg/kubelet/runtime.go

@@ -29,7 +29,6 @@ type runtimeState struct {
 	networkError             error
 	internalError            error
 	cidr                     string
-	initError                error
 	healthChecks             []*healthCheck
 }
 
@@ -78,19 +77,10 @@ func (s *runtimeState) podCIDR() string {
 	return s.cidr
 }
 
-func (s *runtimeState) setInitError(err error) {
-	s.Lock()
-	defer s.Unlock()
-	s.initError = err
-}
-
 func (s *runtimeState) runtimeErrors() []string {
 	s.RLock()
 	defer s.RUnlock()
 	var ret []string
-	if s.initError != nil {
-		ret = append(ret, s.initError.Error())
-	}
 	if !s.lastBaseRuntimeSync.Add(s.baseRuntimeSyncThreshold).After(time.Now()) {
 		ret = append(ret, "container runtime is down")
 	}