ubuntu_ltp_controllers:memcg_stat_rss: test3 TBROK: timed out on memory.usage_in_bytes

[Stefan Bader]

On kernel06.zvm.s390x with hirsute:linux on sru-20210927 this was observed:

memcg_stat_rss 3 TINFO: Running memcg_process --shm -k 3 -s 4096
memcg_stat_rss 3 TINFO: Warming up pid: 269723
memcg_stat_rss 3 TINFO: Process is still here after warm up: 269723
memcg_stat_rss 3 TBROK: timed out on memory.usage_in_bytes
memcg_stat_rss 3 TINFO: AppArmor enabled, this may affect test results
memcg_stat_rss 3 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)
memcg_stat_rss 3 TINFO: loaded AppArmor profiles: none

[Po-Hsu Lin (cypressyew)]

Found on B-aws-4.15.0-1140.15 with amd64 instance t3a.2xlarge

Reproduce rate: 3 out of 3 attempts.

In this case it's the 5th test case:
memcg_stat_rss 5 TINFO: Running memcg_process --mmap-lock1 -s 135168
memcg_stat_rss 5 TINFO: Warming up pid: 22914
memcg_stat_rss 5 TINFO: Process is still here after warm up: 22914
memcg_stat_rss 5 TBROK: timed out on memory.usage_in_bytes 0 0 135168
memcg_stat_rss 5 TINFO: AppArmor enabled, this may affect test results
memcg_stat_rss 5 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)
memcg_stat_rss 5 TINFO: loaded AppArmor profiles: none

This is the only instance that failed with it.

[Roxana Nicolescu (roxanan)]

found on bionic-hwe-5.4
5.4.0-149.166~18.04.1

[Noah Wager (nwager)]

found on focal:linux-oracle-5.15.0-1045.51~20.04.1 on instance BM.Standard2.52, with test 6:

memcg_stat_rss 6 TINFO: Running memcg_process --mmap-anon -s 135168
memcg_stat_rss 6 TINFO: Warming up pid: 122298
memcg_stat_rss 6 TINFO: Process is still here after warm up: 122298
memcg_stat_rss 6 TPASS: rss is 135168 as expected
memcg_stat_rss 6 TBROK: timed out on memory.usage_in_bytes 131072 135168 135168
memcg_stat_rss 6 TINFO: AppArmor enabled, this may affect test results
memcg_stat_rss 6 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)
memcg_stat_rss 6 TINFO: loaded AppArmor profiles: none