Comment 2 for bug 1837035

If you run the test again on the same node, it will pass:
<<<test_start>>>
tag=memcg_stat_rss stime=1563449251
cmdline="memcg_stat_rss.sh"
contacts=""
analysis=exit
<<<test_output>>>
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: 2865
memcg_stat_rss 1 TINFO: Process is still here after warm up: 2865
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: 2885
memcg_stat_rss 2 TINFO: Process is still here after warm up: 2885
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: 2905
memcg_stat_rss 3 TINFO: Process is still here after warm up: 2905
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: 2925
memcg_stat_rss 4 TINFO: Process is still here after warm up: 2925
memcg_stat_rss 4 TPASS: rss is 135168 as expected
memcg_stat_rss 5 TINFO: Starting test 5
/opt/ltp/testcases/bin/memcg_stat_rss.sh: 522: echo: echo: I/O error
memcg_stat_rss 5 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
memcg_stat_rss 5 TINFO: Running memcg_process --mmap-lock1 -s 135168
memcg_stat_rss 5 TINFO: Warming up pid: 2947
memcg_stat_rss 5 TINFO: Process is still here after warm up: 2947
memcg_stat_rss 5 TPASS: rss is 135168 as expected
memcg_stat_rss 6 TINFO: Starting test 6
/opt/ltp/testcases/bin/memcg_stat_rss.sh: 522: echo: echo: I/O error
memcg_stat_rss 6 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
memcg_stat_rss 6 TINFO: Running memcg_process --mmap-anon -s 135168
memcg_stat_rss 6 TINFO: Warming up pid: 2967
memcg_stat_rss 6 TINFO: Process is still here after warm up: 2967
memcg_stat_rss 6 TPASS: rss is 135168 as expected
memcg_stat_rss 7 TPASS: rss is 0 as expected
memcg_stat_rss 8 TINFO: Starting test 7
/opt/ltp/testcases/bin/memcg_stat_rss.sh: 522: echo: echo: I/O error
memcg_stat_rss 8 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
memcg_stat_rss 8 TINFO: Running memcg_process --mmap-file -s 4096
memcg_stat_rss 8 TINFO: Warming up pid: 2990
memcg_stat_rss 8 TINFO: Process is still here after warm up: 2990
memcg_stat_rss 8 TPASS: rss is 0 as expected
memcg_stat_rss 9 TPASS: rss is 0 as expected
memcg_stat_rss 10 TINFO: Starting test 8
/opt/ltp/testcases/bin/memcg_stat_rss.sh: 522: echo: echo: I/O error
memcg_stat_rss 10 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
memcg_stat_rss 10 TINFO: Running memcg_process --shm -k 8 -s 4096
memcg_stat_rss 10 TINFO: Warming up pid: 3013
memcg_stat_rss 10 TINFO: Process is still here after warm up: 3013
memcg_stat_rss 10 TPASS: rss is 0 as expected
memcg_stat_rss 11 TPASS: rss is 0 as expected
memcg_stat_rss 12 TINFO: Starting test 9
/opt/ltp/testcases/bin/memcg_stat_rss.sh: 522: echo: echo: I/O error
memcg_stat_rss 12 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
memcg_stat_rss 12 TINFO: Running memcg_process --mmap-anon --mmap-file --shm -s 135168
memcg_stat_rss 12 TINFO: Warming up pid: 3042
memcg_stat_rss 12 TINFO: Process is still here after warm up: 3042
memcg_stat_rss 12 TPASS: rss is 135168 as expected
memcg_stat_rss 13 TPASS: rss is 0 as expected
memcg_stat_rss 14 TINFO: Starting test 10
/opt/ltp/testcases/bin/memcg_stat_rss.sh: 522: echo: echo: I/O error
memcg_stat_rss 14 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
memcg_stat_rss 14 TINFO: Running memcg_process --mmap-lock1 -s 135168
memcg_stat_rss 14 TINFO: Warming up pid: 3065
memcg_stat_rss 14 TINFO: Process is still here after warm up: 3065
memcg_stat_rss 14 TPASS: rss is 135168 as expected
memcg_stat_rss 15 TPASS: rss is 0 as expected
<<<execution_status>>>
initiation_status="ok"
duration=11 termination_type=exited termination_id=0 corefile=no
cutime=19 cstime=9
<<<test_end>>>