cpuset_regression_test from ubuntu_ltp_controllers failed on B/F-s390x

[Po-Hsu Lin]

Issue found on B-4.15.0-192.203 s390x zVM and LPAR

It looks like a new failure after updating our LTP fork in 20220811 [1]

Test log:
INFO: Test start time: Fri 12 Aug 04:13:14 BST 2022
COMMAND: /opt/ltp/bin/ltp-pan -q -e -S -a 17829 -n 17829 -f /tmp/ltp-QgtTUiO3dI/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_regression_test 1 TINFO: timeout per run is 0h 5m 0s
cpuset_regression_test 1 TINFO: test starts with cgroup version 1
sh: echo: I/O error
cpuset_regression_test 1 TFAIL: 'echo 1 > /sys/fs/cgroup/cpuset/testdir/cpuset.cpu_exclusive' failed
cpuset_regression_test 1 TINFO: AppArmor enabled, this may affect test results
cpuset_regression_test 1 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)
cpuset_regression_test 1 TINFO: loaded AppArmor profiles: none

Summary:
passed 0
failed 1
broken 0
skipped 0
warnings 0
INFO: ltp-pan reported some tests FAIL
LTP Version: 20220527
INFO: Test end time: Fri 12 Aug 04:13:14 BST 2022

Next is to run a bisect for this.

[1] https://lists.ubuntu.com/archives/kernel-team/2022-August/132526.html

[Po-Hsu Lin (cypressyew)]

Can be found on F s390x (LPAR / zVM) as well.

[Portia Stephens (portias)]

Also seen on linux-xilinx-zyqnmp-5.4.0-1019.22

[Po-Hsu Lin (cypressyew)]

This is affecting X-s390x as well.