cgroup from ubuntu_ltp_controllers failed (TBROK: 'rdma' controller is unknown to LTP)

[Po-Hsu Lin]

With LTP update (bug 1982995) to commit ac1a3e40c5 "controllers: update cgroup_regression_test to use newer cgroup lib"

cgroup test:
INFO: Test start time: Wed Aug 3 13:52:37 UTC 2022
COMMAND: /opt/ltp/bin/ltp-pan -q -e -S -a 56575 -n 56575 -f /tmp/ltp-cPjidZlr9W/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.......
cgroup_regression_test 1 TINFO: timeout per run is 0h 5m 0s
cgroup_regression_test 1 TPASS: no kernel bug was found
cgroup_regression_test 2 TPASS: notify_on_release is inherited
cgroup_regression_test 3 TPASS: no kernel bug was found
cgroup_regression_test 4 TCONF: CONFIG_LOCKDEP is not enabled
cgroup_regression_test 5 TINFO: The '/tmp/ltp-cPjidZlr9W/LTP_cgroup_regression_test.vvkEkXC0vR/cgroup' is not mounted, skipping umount
cgroup_regression_test 5 TPASS: no kernel bug was found
cgroup_regression_test 6 TCONF: CONFIG_CGROUP_NS is NOT supported in Kernels >= 3.0
tst_cgroup.c:819: TBROK: 'rdma' controller is unknown to LTP
cgroup_regression_test 7 TBROK: 'tst_cgctl require' exited
cgroup_regression_test 7 TINFO: AppArmor enabled, this may affect test results
cgroup_regression_test 7 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)
cgroup_regression_test 7 TINFO: loaded AppArmor profiles: none

Summary:
passed 4
failed 0
broken 1
skipped 2
warnings 0
INFO: ltp-pan reported some tests FAIL
LTP Version: 20220527
INFO: Test end time: Wed Aug 3 13:53:38 UTC 2022

memcg_control:
INFO: Test start time: Wed Aug 3 14:25:17 UTC 2022
COMMAND: /opt/ltp/bin/ltp-pan -q -e -S -a 104816 -n 104816 -f /tmp/ltp-3EW278bbe8/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.......
memcg_control_test 1 TINFO: timeout per run is 0h 5m 0s
memcg_control_test 1 TINFO: Test starts with cgroup version 1
memcg_control_test 1 TINFO: Test #1: Checking if the memory usage limit imposed by the topmost group is enforced
tst_rod: Failed to open '/sys/fs/cgroup/memory/ltp/test-104860/memory.memsw.limit_in_bytes' for writing: Permission denied
memcg_control_test 1 TBROK: echo 4096 > /sys/fs/cgroup/memory/ltp/test-104860/memory.memsw.limit_in_bytes failed
memcg_control_test 1 TINFO: AppArmor enabled, this may affect test results
memcg_control_test 1 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)
memcg_control_test 1 TINFO: loaded AppArmor profiles: none

Summary:
passed 0
failed 0
broken 1
skipped 0
warnings 0
INFO: ltp-pan reported some tests FAIL
LTP Version: 20220527
INFO: Test end time: Wed Aug 3 14:25:17 UTC 2022

[Po-Hsu Lin (cypressyew)]

This issue exists with the latest LTP tip as well (d4f0d8ed1d6 "read_all: Prevent FNM_EXTMATCH redefinition")

[Luke Nowakowski-Krijger (lukenow)]

That rdma issue is new, I forgot to add that controller to the list off supported controllers.. Ill get around to fixing that one.

But the second issue feels like its been one that has been failing for a while if I remember correctly?

[Po-Hsu Lin (cypressyew)]

Hi Luke,

Here is the old memcg_control test result (with 6f88e0f6 LTP 20220527) on Focal:

<<<test_start>>>
tag=memcg_control stime=1659924061
cmdline="memcg_control_test.sh"
contacts=""
analysis=exit
<<<test_output>>>
incrementing stop
memcg_control 0 TINFO : Test #1: Checking if the memory usage limit imposed by the topmost group is enforced
/opt/ltp/testcases/bin/memcg_control_test.sh: 86: cannot create /tmp/ltp-sqrGf2cIhv/mnt/1/memory.memsw.limit_in_bytes: Permission denied
memcg_control 1 TPASS : Test #1: passed
memcg_control 1 TPASS : memcg_control: passed
<<<execution_status>>>
initiation_status="ok"
duration=6 termination_type=exited termination_id=0 corefile=no
cutime=2 cstime=3
<<<test_end>>>

Although it's also complaining about permission issue, but the test didn't fail. I haven't check the code yet but a quick bisect shows a77b65bbe5 ("controllers: Update memcg_control_test to newer test lib and cgroup lib") is the first bad commit.

[Cory Todd (corytodd)]

This affects 2022.08.08/focal/linux-fips/5.4.0-1060.68

[Joseph Salisbury (jsalisbury)]

This also affects bionic:linux-aws-5.4:

17645 memcg_control_test 1 TBROK: echo 4096 > /sys/fs/cgroup/memory/ltp/test-3614/memory.memsw.limit_in_bytes failed

[Luke Nowakowski-Krijger (lukenow)]

Patch submitted upstream to fix the rdma controller issue [LTP][PATCH] API/cgroup: Add rdma controller https://lists.linux.it/pipermail/ltp/2022-August/030257.html

Im looking into the issue for the other failure still and will follow up with a fix for that.

[Po-Hsu Lin (cypressyew)]

Looks like this issue will gone with LTP 20230516, commit 3ebc2dfa85c

[Po-Hsu Lin (cypressyew)]

For memcg_control please refer to bug 2028776

[Po-Hsu Lin (cypressyew)]

Hints removed, closing this bug.