This issue does not exist on J-realtime anymore.

 INFO: Test start time: Tue Aug 16 06:08:56 UTC 2022
 COMMAND:    /opt/ltp/bin/ltp-pan -q  -e -S   -a 648348     -n 648348  -f 
/tmp/ltp-qVqxKBH0Bi/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.......
 pids 1 TINFO: timeout per run is 0h 5m 0s
 pids 1 TINFO: test starts with cgroup version 2
 pids 1 TINFO: Running testcase 1 with 1 processes
 pids 1 TPASS: fork didn't fail
 
 Summary:
 passed   1
 failed   0
 broken   0
 skipped  0
 warnings 0
 INFO: ltp-pan reported all tests PASS
 LTP Version: 20220527
 INFO: Test end time: Tue Aug 16 06:08:56 UTC 2022


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

** Changed in: linux (Ubuntu Jammy)
       Status: Incomplete => Fix Released

** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1953345

Title:
  memcg is disabled in v5.15 RT kernel (known issue)

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Jammy:
  Fix Released

Bug description:
  From v5.15.2-rt20 announcement:
    Known issues:
    - The "Memory controller" (CONFIG_MEMCG) has been disabled.

  This might be the cause of ubuntu_ltp_controllers failure - 
ubuntu_ltp_controllers.pids_1_100:
  ##########
  COMMAND: /opt/ltp/bin/ltp-pan -q -e -S -a 466487 -n 466487 -f 
/tmp/ltp-DbBcUelSWj/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.......
  pids 1 TINFO: timeout per run is 0h 5m 0s
  mount: /dev/cgroup: none already mounted on /sys/fs/bpf.
  pids 1 TBROK: mount -t cgroup -o pids none /dev/cgroup failed
  pids 1 TINFO: removing created directories
  rmdir: failed to remove '/dev/cgroup/ltp_pids_1': No such file or directory
  pids 1 TINFO: Umounting pids
  umount: /dev/cgroup: not mounted.
  pids 1 TINFO: AppArmor enabled, this may affect test results
  pids 1 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires 
super/root)
  pids 1 TINFO: loaded AppArmor profiles: none
  ##########

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