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[Jürg Häfliger <1817893@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1812149 ***
    https://bugs.launchpad.net/bugs/1812149

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1817893

Title:
  ubuntu_kernel_selftests.cpu-hotplug fails with Bionic on single
  processor systems

Status in ubuntu-kernel-tests:
  New
Status in linux-aws package in Ubuntu:
  Invalid

Bug description:
  Log from an ADT failure:
      amd64: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-bionic/bionic/amd64/l/linux-aws/20190215_172152_24535@/log.gz

  When the test system has only one available CPU, the cpu-on-off-
  test.sh script used to return success:

  22:14:42 DEBUG| [stdout] selftests: cpu-on-off-test.sh
  22:14:42 DEBUG| [stdout] ========================================
  22:14:42 DEBUG| [stdout] pid 30673's current affinity mask: 1
  22:14:42 DEBUG| [stdout] pid 30673's new affinity mask: 1
  22:14:42 DEBUG| [stdout] CPU online/offline summary:
  22:14:42 DEBUG| [stdout] skip all tests:: since there is only one cpu: 0
  22:14:42 DEBUG| [stdout] ok 1..1 selftests: cpu-on-off-test.sh [PASS]

  However, after the script from the source package started to be
  replaced to fix bug 1809439 (commit
  https://kernel.ubuntu.com/git/ubuntu/autotest-client-
  tests.git/commit/?id=53ef6cf2cc35cbd13a16c363af05e22a0cbcbb75) it
  started to fail:

  18:12:56 DEBUG| [stdout] selftests: cpu-on-off-test.sh
  18:12:56 DEBUG| [stdout] ========================================
  18:12:56 DEBUG| [stdout] pid 30620's current affinity mask: 1
  18:12:56 DEBUG| [stdout] pid 30620's new affinity mask: 1
  18:12:56 DEBUG| [stdout] CPU online/offline summary:
  18:12:56 DEBUG| [stdout] skip all tests:: since there is only one cpu: 0
  18:12:56 DEBUG| [stdout] not ok 1..1 selftests:  cpu-on-off-test.sh [FAIL]

  The failure is caused on Bionic by the fact that the new script
  returns ksft_skip=4 when the test cannot be performed, however this
  return code is not considered as SKIP on the older Kselftest
  framework, but as FAIL instead. For the same reason this also probably
  impacts older series as well.

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