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[Brian Murray <1923114@xxxxxxxxxxxxxxxxxx>]

Ubuntu 20.10 (Groovy Gorilla) has reached end of life, so this bug will
not be fixed for that specific release.

** Changed in: linux-azure (Ubuntu Groovy)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1923114

Title:
  ubuntu_kernel_selftests: ./cpu-on-off-test.sh: line 94: echo: write
  error: Device or resource busy

Status in ubuntu-kernel-tests:
  In Progress
Status in linux-azure package in Ubuntu:
  New
Status in linux-azure-4.15 package in Ubuntu:
  New
Status in linux-azure source package in Trusty:
  New
Status in linux-azure-4.15 source package in Trusty:
  New
Status in linux-azure source package in Xenial:
  New
Status in linux-azure-4.15 source package in Xenial:
  New
Status in linux-azure source package in Bionic:
  New
Status in linux-azure-4.15 source package in Bionic:
  New
Status in linux-azure source package in Groovy:
  Won't Fix
Status in linux-azure-4.15 source package in Groovy:
  Won't Fix

Bug description:
  Test cpu-hotplug from ubuntu_kernel_selftests failed with
  bionic:linux-azure-4.15 running on a Basic A2 with 2 cores (besides
  other instance types):

  selftests: cpu-on-off-test.sh
  ========================================
  pid 28041's current affinity mask: 3
  pid 28041's new affinity mask: 1
  CPU online/offline summary:
  present_cpus = 0-1 present_max = 1
  Cpus in online state: 0-1
  Cpus in offline state: 0
  Limited scope test: one hotplug cpu
  (leaves cpu in the original state):
  online to offline to online: cpu 1
  not ok 1..1 selftests: cpu-on-off-test.sh [FAIL]
  ./cpu-on-off-test.sh: line 94: echo: write error: Device or resource busy
  offline_cpu_expect_success 1: unexpected fail

  http://10.246.72.46/4.15.0-1112.124~16.04.1-azure/xenial-linux-azure-
  azure-
  amd64-4.15.0-Basic_A2-ubuntu_kernel_selftests/ubuntu_kernel_selftests/results/ubuntu_kernel_selftests.cpu-
  hotplug/debug/ubuntu_kernel_selftests.cpu-hotplug.DEBUG.html

  The problem happens at "autotest-client-
  tests/ubuntu_kernel_selftests/cpu-on-off-test.sh" when executing:

          echo 0 > $SYSFS/devices/system/cpu/cpu$1/online

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