kubernetes: Flaking Test: subpath failures in new-master-upgrade-cluster-new-parallel, other jobs

Which jobs are failing: gce-new-master-upgrade-cluster-new-parallel

Which test(s) are failing:

Varies, but all subpath failures, including:

• [sig-storage] CSI Volumes [Driver: csi-hostpath-v0] [Testpattern: Dynamic PV (default fs)] subPath should fail if subpath with backstepping is outside the volume [Slow]
• [sig-storage] CSI Volumes [Driver: csi-hostpath] [Testpattern: Dynamic PV (default fs)] subPath should fail if subpath directory is outside the volume [Slow]
• [sig-storage] CSI Volumes [Driver: csi-hostpath-v0] [Testpattern: Dynamic PV (default fs)] subPath should fail if subpath file is outside the volume [Slow]
• [sig-storage] CSI Volumes [Driver: csi-hostpath] [Testpattern: Dynamic PV (default fs)] subPath should fail if subpath file is outside the volume [Slow]

… and pretty much every other subpath test, but never all of them at once.

There’s also a few other storage tests failing, such as:

• [sig-storage] Volume expand [Slow] Verify if editing PVC allows resize
• [sig-storage] Detaching volumes should not work when mount is in progress

Since when has it been failing: 11/22

Testgrid link: https://k8s-testgrid.appspot.com/sig-release-master-upgrade#gce-new-master-upgrade-cluster-new-parallel&include-filter-by-regex=.*CSI.*&width=20

Reason for failure:

These flakes started around the time that #71314 merged, but doesn’t match up with the exact merge stamp, so it’s probably coincidental.

The subpath test failures seem to be mostly timeouts:

/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/test/e2e/storage/testsuites/subpath.go:254
while waiting for failed event to occur
Expected error:
    <*errors.errorString | 0xc0000d1860>: {
        s: "timed out waiting for the condition",
    }
    timed out waiting for the condition
not to have occurred
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/test/e2e/storage/testsuites/subpath.go:601

… so possibly this is just GCE fail.

Anything else we need to know:

This test job has always been flaky, with around a 40% failure rate.

/kind flake /sig storage /priority important-soon

cc @saad-ali @AishSundar @liggitt