fix: stale smb unmount issue when smb file share is deleted

[andyzhangx]

What type of PR is this?

/kind bug

What this PR does / why we need it:

fix: state smb unmount issue when smb file share is deleted and then unmount

related to fix: kubernetes/kubernetes#121851

there is behavior change from linux kernel 5.15.0-1051-azure (or earlier version), when smb file share is deleted, the upstream mount-utils depends on following logic to check whether smb mount is in stale state, while starting from the former kernel version, it returns resource temporarily unavailable error instead of ErrNotExist, thus this PR tries to add a new judgement in the mount-utils in IsCorruptedMnt func, here EWOULDBLOCK is resource temporarily unavailable error.

{11, "EWOULDBLOCK", "resource temporarily unavailable"},

• original logic (won't work now since it now returns it returns resource temporarily unavailable error instead of ErrNotExist in kernel)
  https://github.com/kubernetes/kubernetes/blob/a95a79c785ec449074afc689306d1155aa039025/staging/src/k8s.io/mount-utils/mount_helper_unix.go#L188-L198

• currunt error message is like following:

kubernetes.io/csi: Unmounter.TearDownAt failed: rpc error: code = Internal desc = failed to unmount target /var/lib/kubelet/pods/bf4554ca-de3d-43e3-8d93-f35f14406e4f/volumes/kubernetes.io~csi/volume1/mount: Error checking path: stat /var/lib/kubelet/pods/bf4554ca-de3d-43e3-8d93-f35f14406e4f/volumes/kubernetes.io~csi/volume1/mount: resource temporarily unavailable

• how to repro this issue

1. mount smb file share using csi driver or subPath volume
2. delete remote smb file share
3. delete pod, and unmount would be stuck forever (pod in terminating state forever)

• workaround
  force delete the pod

• impact

This issue does not only break CSI drivers, it also breaks on pods with subPath smb volume, error msg is like following, this requires a patch version fix of kubelet since subPath unmount does not go through CSI driver.

Error: error cleaning subPath mounts for volume "volume1" (UniqueName: "kubernetes.io/csi/644d3846-709a-4165-8b13-c1003409d588-volume1") pod "644d3846-709a-4165-8b13-c1003409d588" (UID: "644d3846-709a-4165-8b13-c1003409d588") : error processing /var/lib/kubelet/pods/644d3846-709a-4165-8b13-c1003409d588/volume-subpaths/volume1/helloworld-mount-subpath: error cleaning subpath mount /var/lib/kubelet/pods/644d3846-709a-4165-8b13-c1003409d588/volume-subpaths/volume1/helloworld-mount-subpath/0: Error checking path: stat /var/lib/kubelet/pods/644d3846-709a-4165-8b13-c1003409d588/volume-subpaths/volume1/helloworld-mount-subpath/0: resource temporarily unavailable

Which issue(s) this PR fixes:

Fixes #693

Special notes for your reviewer:

Does this PR introduce a user-facing change?

fix: statle smb mount issue when smb file share is deleted and then unmount

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

fix: statle smb mount issue when smb file share is deleted and then unmount

[k8s-ci-robot]

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This pull-request has been approved by: andyzhangx

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