canonical-ubuntu-qa team mailing list archive

[Ian Whitfield <2122374@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

TDX-enabled machines on the Google cloud don't support CPU hotplug.
Errors appear as "Operation not supported" when trying to offline a CPU.

Known affected tests:
ubuntu_kernel_selftests:cpu-hotplug:cpu-on-off-test.sh
ubuntu_ltp:cpuhotplug:cpuhotplug*
ubuntu_ltp_controllers:cpuset_hotplug

Example output:
[stdout] # timeout set to 45
[stdout] # selftests: cpu-hotplug: cpu-on-off-test.sh
[stdout] # pid 15891's current affinity mask: ff
[stdout] # pid 15891's new affinity mask: 1
[stdout] # CPU online/offline summary:
[stdout] # present_cpus = 0-7 present_max = 7
[stdout] # Cpus in online state: 0-7
[stdout] # Cpus in offline state: 0
[stdout] # Limited scope test: one hotplug cpu
[stdout] # (leaves cpu in the original state):
[stdout] # online to offline to online: cpu 7
[stdout] # ./cpu-on-off-test.sh: line 97: echo: write error: Operation not supported
[stdout] # offline_cpu_expect_success 7: unexpected fail

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

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https://bugs.launchpad.net/bugs/2122374

Title:
  CPU hotplug tests fail on Google TDX instances

Status in ubuntu-kernel-tests:
  New

Bug description:
  TDX-enabled machines on the Google cloud don't support CPU hotplug.
  Errors appear as "Operation not supported" when trying to offline a
  CPU.

  Known affected tests:
  ubuntu_kernel_selftests:cpu-hotplug:cpu-on-off-test.sh
  ubuntu_ltp:cpuhotplug:cpuhotplug*
  ubuntu_ltp_controllers:cpuset_hotplug

  Example output:
  [stdout] # timeout set to 45
  [stdout] # selftests: cpu-hotplug: cpu-on-off-test.sh
  [stdout] # pid 15891's current affinity mask: ff
  [stdout] # pid 15891's new affinity mask: 1
  [stdout] # CPU online/offline summary:
  [stdout] # present_cpus = 0-7 present_max = 7
  [stdout] # Cpus in online state: 0-7
  [stdout] # Cpus in offline state: 0
  [stdout] # Limited scope test: one hotplug cpu
  [stdout] # (leaves cpu in the original state):
  [stdout] # online to offline to online: cpu 7
  [stdout] # ./cpu-on-off-test.sh: line 97: echo: write error: Operation not supported
  [stdout] # offline_cpu_expect_success 7: unexpected fail

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