[Bug 1836593] Re: race condition in dep8 test

[Rafael David Tinoco]

Look at:

https://bugs.launchpad.net/ubuntu/+source/cloud-utils/+bug/1810857/comments/12
https://bugs.launchpad.net/ubuntu/+source/cloud-utils/+bug/1835124/comments/23

This particular item I can't verify as it is an intermittent race
condition in ppc64el arch, but, afaict, the SRU did not step into any
other functionality (as you can prove by other verifications).

Because of that I'm marking this as verification-done.

** Tags removed: verification-needed verification-needed-disco
** Tags added: verification-done verification-done-disco

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https://bugs.launchpad.net/bugs/1836593

Title:
  race condition in dep8 test

Status in cloud-utils:
  Fix Committed
Status in cloud-utils package in Ubuntu:
  Fix Released
Status in cloud-utils source package in Disco:
  Fix Committed

Bug description:
  [Impact]

   * 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].

  [Test Case]

  * 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'.

  [Regression Potential]

  * Minor potential as the only changes being added are "udevadm
  settle". This will likely add a bit of more time to execution but
  won't change the logic of what was already being done (just serialize
  udev events).

  [Other Info]

  [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



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