Observed a variation of this in B/aws-5.4, cycle sru-20210621 :

18:43:32 DEBUG| [stdout] memcg_stat_rss 9 TINFO: Running memcg_process 
--mmap-anon --mmap-file --shm -s 135168
18:43:32 DEBUG| [stdout] memcg_stat_rss 9 TINFO: Warming up pid: 64876
18:43:32 DEBUG| [stdout] memcg_process: shmget() failed: Invalid argument
18:43:32 DEBUG| [stdout] /opt/ltp/testcases/bin/memcg_stat_rss.sh: 223: kill: 
No such process
18:43:32 DEBUG| [stdout] 
18:43:32 DEBUG| [stdout] memcg_stat_rss 9 TFAIL: Process 64876 exited with 1 
after warm up
18:43:32 DEBUG| [stdout] memcg_stat_rss 10 TINFO: Running memcg_process 
--mmap-lock1 -s 135168
18:43:32 DEBUG| [stdout] memcg_stat_rss 10 TINFO: Warming up pid: 64888
18:43:32 DEBUG| [stdout] memcg_stat_rss 10 TINFO: Process is still here after 
warm up: 64888
18:43:32 DEBUG| [stdout] memcg_stat_rss 10 TPASS: rss is 135168 as expected
18:43:32 DEBUG| [stdout] memcg_stat_rss 10 TPASS: rss is 0 as expected



** Tags added: sru-20210621

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https://bugs.launchpad.net/bugs/1837035

Title:
  memcg_stat_rss from controllers in ubuntu_ltp failed

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