ubuntu_ltp_controllers:memcg_stat fails on arch s390x.zvm with focal:linux 5.4.0-156.173

[Roxana Nicolescu]

Seen on kernel04.
Link http://10.246.75.167/2023.07.10/focal/linux/5.4.0-156.173/sru-generic-metal-kernel04.s390x.zvm-ubuntu_ltp_controllers-log.html#memcg_stat-start

On the previous cycle (2023.06.12) test passed on this instance.

For other arches, this test passes.

[Roxana Nicolescu (roxanan)]

Now it seems it fails with #2029371 on 5.4.0-162.
16852 Running tests.......
      16853 memcg_stat_test 1 TINFO: timeout per run is 0h 5m 0s
      16854 memcg_stat_test 1 TINFO: set /sys/fs/cgroup/memory/memory.use_hierarchy to 0 failed
      16855 memcg_stat_test 1 TINFO: Test cache
      16856 memcg_stat_test 1 TINFO: Running memcg_process --shm -k 3 -s 135168
      16857 memcg_stat_test 1 TINFO: Warming up pid: 254425
      16858 memcg_stat_test 1 TINFO: Process is still here after warm up: 254425
      16859 memcg_stat_test 1 TFAIL: cache is 0, 135168 expected
      16860 memcg_stat_test 2 TINFO: Test mapped_file
      16861 memcg_stat_test 2 TINFO: Running memcg_process --mmap-file -s 135168
      16862 memcg_stat_test 2 TINFO: Warming up pid: 254505
      16863 memcg_stat_test 2 TINFO: Process is still here after warm up: 254505
      16864 memcg_stat_test 2 TPASS: mapped_file is 135168 as expected
      16865 memcg_stat_test 3 TINFO: Test unevictable with MAP_LOCKED
      16866 memcg_stat_test 3 TINFO: Running memcg_process --mmap-lock1 -s 135168
      16867 memcg_stat_test 3 TINFO: Warming up pid: 254527
      16868 memcg_stat_test 3 TINFO: Process is still here after warm up: 254527
      16869 memcg_stat_test 3 TPASS: unevictable is 135168 as expected
      16870 memcg_stat_test 4 TINFO: Test unevictable with mlock
      16871 memcg_stat_test 4 TINFO: Running memcg_process --mmap-lock2 -s 135168
      16872 memcg_stat_test 4 TINFO: Warming up pid: 254543
      16873 memcg_stat_test 4 TINFO: Process is still here after warm up: 254543
      16874 memcg_stat_test 4 TPASS: unevictable is 135168 as expected
      16875 memcg_stat_test 5 TINFO: Test hierarchical_memory_limit with enabling hierarchical accounting
      16876 memcg_stat_test 5 TPASS: echo 184320 > memory.limit_in_bytes passed as expected
      16877 memcg_stat_test 5 TPASS: echo 454656 > subgroup/memory.limit_in_bytes passed as expected
      16878 memcg_stat_test 5 TPASS: hierarchical_memory_limit is 184320 as expected
      16879 memcg_stat_test 6 TINFO: Test hierarchical_memory_limit with disabling hierarchical accounting
      16880 memcg_stat_test 6 TCONF: Test requires root cgroup memory.use_hierarchy=0
      16881 memcg_stat_test 6 TINFO: AppArmor enabled, this may affect test results
      16882 memcg_stat_test 6 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)
      16883 memcg_stat_test 6 TINFO: loaded AppArmor profiles: none
      16884
      16885 Summary:
      16886 passed 6
      16887 failed 1
      16888 broken 0
      16889 skipped 1
      16890 warnings 0
      16891 INFO: ltp-pan reported some tests FAIL
      16892 LTP Version: 20230516
      16893 INFO: Test end time: Mon 14 Aug 21:08:49 BST 202