Public bug reported:

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.

** Affects: ubuntu-kernel-tests
     Importance: Undecided
         Status: New

** Affects: linux-aws (Ubuntu)
     Importance: Undecided
         Status: Invalid


** Tags: kernel-adt-failure

** Tags added: kernel-adt-failure

** Also affects: ubuntu-kernel-tests
   Importance: Undecided
       Status: New

** Summary changed:

- linux-aws 4.15.0-1033.35 ADT test failure with linux-aws 4.15.0-1033.35
+ ubuntu_kernel_selftests.cpu-hotplug fails with Bionic on single processor 
systems

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

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

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