Sanity test is not idempotent

[songjiaxun]

What happened:
If you ran the sanity test twice, one test would fail. Seems like one volume is not mounted.
sudo umount -f /tmp/aa* helps.

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Controller Service CreateVolume
  should not fail when creating volume with maximum-length name
  /home/azureuser/go/pkg/mod/github.com/kubernetes-csi/[email protected]+incompatible/pkg/sanity/controller.go:639
STEP: reusing connection to CSI driver at unix:///tmp/csi.sock
STEP: creating mount and staging directories
I1116 00:09:09.340667  130286 utils.go:47] GRPC call: /csi.v1.Controller/ControllerGetCapabilities
I1116 00:09:09.340688  130286 utils.go:48] GRPC request: {}
I1116 00:09:09.340731  130286 controllerserver.go:175] Using default ControllerGetCapabilities
I1116 00:09:09.340739  130286 utils.go:53] GRPC response: {"capabilities":[{"Type":{"Rpc":{"type":1}}}]}
STEP: creating a volume
I1116 00:09:09.341127  130286 utils.go:47] GRPC call: /csi.v1.Controller/CreateVolume
I1116 00:09:09.341142  130286 utils.go:48] GRPC request: {"capacity_range":{"required_bytes":10737418240},"name":"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa","parameters":{"server":"127.0.0.1","share":"/"},"volume_capabilities":[{"AccessType":{"Mount":{}},"access_mode":{"mode":1}}]}
I1116 00:09:09.341232  130286 controllerserver.go:243] internally mounting 127.0.0.1:/ at /tmp/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
I1116 00:09:09.378808  130286 controllerserver.go:261] internally unmounting /tmp/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
W1116 00:09:09.378835  130286 controllerserver.go:75] failed to unmount nfs server: rpc error: code = InvalidArgument desc = Volume ID missing in request
E1116 00:09:09.378842  130286 utils.go:51] GRPC error: rpc error: code = Internal desc = failed to make subdirectory: mkdir /tmp/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa: file exists

• Failure [0.039 seconds]
Controller Service
/home/azureuser/go/pkg/mod/github.com/kubernetes-csi/[email protected]+incompatible/pkg/sanity/tests.go:44
  CreateVolume
  /home/azureuser/go/pkg/mod/github.com/kubernetes-csi/[email protected]+incompatible/pkg/sanity/controller.go:358
    should not fail when creating volume with maximum-length name [It]
    /home/azureuser/go/pkg/mod/github.com/kubernetes-csi/[email protected]+incompatible/pkg/sanity/controller.go:639

    Unexpected error:
        <*status.statusError | 0xc0003e4840>: {
            state: {
                NoUnkeyedLiterals: {},
                DoNotCompare: [],
                DoNotCopy: [],
                atomicMessageInfo: nil,
            },
            sizeCache: 0,
            unknownFields: nil,
            Code: 13,
            Message: "failed to make subdirectory: mkdir /tmp/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa: file exists",
            Details: nil,
        }
        rpc error: code = Internal desc = failed to make subdirectory: mkdir /tmp/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa: file exists
    occurred

    /home/azureuser/go/pkg/mod/github.com/kubernetes-csi/[email protected]+incompatible/pkg/sanity/controller.go:670
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What you expected to happen:

How to reproduce it:

Anything else we need to know?:

Environment:

• CSI Driver version:
• Kubernetes version (use kubectl version):
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others: