Comment 4 for bug 1837035

Timeout on s390x zVM (kernel04), passed on s390x LPAR:
 startup='Thu Oct 24 09:06:57 2019'
 memcg_stat_rss 1 TINFO: Starting test 1
 /opt/ltp/testcases/bin/memcg_stat_rss.sh: 522: echo: echo: I/O error
 memcg_stat_rss 1 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
 memcg_stat_rss 1 TINFO: Running memcg_process --mmap-anon -s 135168
 memcg_stat_rss 1 TINFO: Warming up pid: 20456
 memcg_stat_rss 1 TINFO: Process is still here after warm up: 20456
 memcg_stat_rss 1 TPASS: rss is 135168 as expected
 memcg_stat_rss 2 TINFO: Starting test 2
 /opt/ltp/testcases/bin/memcg_stat_rss.sh: 522: echo: echo: I/O error
 memcg_stat_rss 2 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
 memcg_stat_rss 2 TINFO: Running memcg_process --mmap-file -s 4096
 memcg_stat_rss 2 TINFO: Warming up pid: 20479
 memcg_stat_rss 2 TINFO: Process is still here after warm up: 20479
 memcg_stat_rss 2 TPASS: rss is 0 as expected
 memcg_stat_rss 3 TINFO: Starting test 3
 /opt/ltp/testcases/bin/memcg_stat_rss.sh: 522: echo: echo: I/O error
 memcg_stat_rss 3 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
 memcg_stat_rss 3 TINFO: Running memcg_process --shm -k 3 -s 4096
 memcg_stat_rss 3 TINFO: Warming up pid: 20499
 memcg_stat_rss 3 TINFO: Process is still here after warm up: 20499
 memcg_stat_rss 3 TPASS: rss is 0 as expected
 memcg_stat_rss 4 TINFO: Starting test 4
 /opt/ltp/testcases/bin/memcg_stat_rss.sh: 522: echo: echo: I/O error
 memcg_stat_rss 4 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
 memcg_stat_rss 4 TINFO: Running memcg_process --mmap-anon --mmap-file --shm -s 135168
 memcg_stat_rss 4 TINFO: Warming up pid: 20521
 memcg_stat_rss 4 TINFO: Process is still here after warm up: 20521
 memcg_stat_rss 4 TBROK: timeouted on memory.usage_in_bytes
 tag=memcg_stat_rss stime=1571904417 dur=14 exit=exited stat=2 core=no cu=3 cs=10