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[Po-Hsu Lin <1986636@xxxxxxxxxxxxxxxxxx>]

This issue can be fixed with LTP updated to commit 5b1b571b36
controllers/cpuset: Make mount failure TCONF. Which is part of our
recent update https://lists.ubuntu.com/archives/kernel-
team/2023-December/147590.html

Hints have been removed, if this is failing again we will need a new bug
report.

** Changed in: ubuntu-kernel-tests
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1986636

Title:
  cpuset tests in ubuntu_ltp_controllers failed with "Could not mount
  cgroup filesystem with  cpuset on /dev/cpuset"

Status in ubuntu-kernel-tests:
  Fix Released

Bug description:
  Issue found on Jammy 5.15.0-47.51 (only on Jammy, works with older
  kernels)

  With LTP fork updated (bug 1982995) with Luke's fix for cgroups, tests are no longer failing with:
      $cgroup_name already mounted or mount point busy (bug 1949532)

  e.g.
  mount: /dev/cgroup: ltp_cgroup already mounted or mount point busy.
  cgroup_fj_function2_memory 1 TBROK: mount -t cgroup -o memory ltp_cgroup /dev/cgroup failed

  Instead, the following 10 cpuset related tests:
   * cpuset_inherit
   * cpuset_base_ops
   * cpuset_exclusive
   * cpuset_hierarchy
   * cpuset_syscall
   * cpuset_sched_domains
   * cpuset_load_balance
   * cpuset_hotplug
   * cpuset_memory
   * cpuset_memory_pressure

  Are now failing with:
  $test_name 1 TFAIL: Could not mount cgroup filesystem with  cpuset on /dev/cpuset..Exiting test

  Complete output from one of them:
  INFO: Test start time: Mon Aug 15 17:13:42 UTC 2022
  COMMAND:    /opt/ltp/bin/ltp-pan -q  -e -S   -a 737848     -n 737848  -f /tmp/ltp-LWz74HNpV1/alltests -l /dev/null  -C /dev/null -T /dev/null
  LOG File: /dev/null
  FAILED COMMAND File: /dev/null
  TCONF COMMAND File: /dev/null
  Running tests.......
  cpuset_sched_domains 1 TINFO: CPUs are numbered continuously starting at 0 (0-255)
  cpuset_sched_domains 1 TINFO: Nodes are numbered continuously starting at 0 (0-1)
  cpuset_sched_domains 1 TFAIL: Could not mount cgroup filesystem with  cpuset on /dev/cpuset..Exiting test
  INFO: ltp-pan reported some tests FAIL
  LTP Version: 20220527
  INFO: Test end time: Mon Aug 15 17:13:42 UTC 2022

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