Comment 0 for bug 1836593

As can be seen in dep8 tests on published results [1], there seems to be a race condition on tear down of at least one of the growpart tests. We seem to see it most on ppc64el [2]. I'm attaching cloud-utils-ppc64el-0.31-0ubuntu1.log that came from [3].

It seems that the test that fails (at least in the 2 cases I saw) is 'growpart-loop'.

The relevant output in the log is this:
    unmount /tmp/test-growpart.VyOylU/mp
    clearing parts [1] from /dev/loop0
    delpart /dev/loop0 1
    delpart: failed to remove partition: Device or resource busy
    FAIL: ./test/test-growpart failed. pt_type=dos resizer=sfdisk

I've copied the relevant portion of the log to attached 'short.log'.

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[1] https://autopkgtest.ubuntu.com/packages/cloud-utils
[2] https://autopkgtest.ubuntu.com/packages/cloud-utils/eoan/ppc64el
[3] https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-eoan/eoan/ppc64el/c/cloud-utils/20190712_175132_5ffd5@/log.gz