On v5.11 kernels the failure looks a little bit different and I think it might be different issue. Since v5.9, the kernel per-group memory is charged towards given group. This failed several tests, e.g. trying to create subgroups.
AWS v5.11, 36-core c4.8xlarge instance: memcg_stat_test 4 TINFO: Process is still here after warm up: 3210 memcg_stat_test 4 TPASS: unevictable is 135168 as expected memcg_stat_test 5 TINFO: Test hierarchical_memory_limit with enabling hierarchical accounting /home/ubuntu/ltp-install/testcases/bin/memcg_stat_test.sh: 47: echo: echo: I/O error memcg_stat_test 5 TFAIL: hierarchical_memory_limit is 270336, 135168 expected memcg_stat_test 6 TINFO: Test hierarchical_memory_limit with disabling hierarchical accounting memcg_stat_test 6 TCONF: Test requires root cgroup memory.use_hierarchy=0 memcg_stat_test 6 TINFO: AppArmor enabled, this may affect test results memcg_stat_test 6 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root) memcg_stat_test 6 TINFO: loaded AppArmor profiles: none For this (v5.11) issue, sent patches to upstream: https://lists.linux.it/pipermail/ltp/2021-July/023804.html -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1829983 Title: memcg_stat from controllers test suite in LTP failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1829983/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
