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[Jürg Häfliger <1847982@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1847982

Title:
  memcg_subgroup_charge from controllers in ubuntu_ltp failed on
  D/E/F/G/I

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux-azure package in Ubuntu:
  Invalid
Status in linux-kvm package in Ubuntu:
  Invalid
Status in linux-oracle package in Ubuntu:
  Invalid
Status in linux-azure source package in Disco:
  Won't Fix
Status in linux-kvm source package in Disco:
  Won't Fix
Status in linux-oracle source package in Disco:
  Won't Fix

Bug description:
  Issue found on Azure Disco kernel 5.0.0-1023.24

  Failed on instance:
    * Standard_GS2
    * Standard_D16s_v3

  Passed on instance:
    * Standard_F32s_v2
    * Standard_L8s_v2
    * Standard_L4s
    * Standard_L8s_v2

  (Although it has passed on these instances, but they all have the same
  test output, just the pids are different)

  
  Test failed with:
    /opt/ltp/testcases/bin/memcg_subgroup_charge.sh: 522: echo: echo: I/O error

   tag=memcg_subgroup_charge stime=1570239843 dur=3 exit=exited stat=1 core=no cu=7 cs=11
   startup='Sat Oct 5 01:44:03 2019'
   memcg_subgroup_charge 1 TINFO: Starting test 1
   /opt/ltp/testcases/bin/memcg_subgroup_charge.sh: 522: echo: echo: I/O error
   memcg_subgroup_charge 1 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
   memcg_subgroup_charge 1 TINFO: Running memcg_process --mmap-anon -s 135168
   memcg_subgroup_charge 1 TINFO: Warming up pid: 119041
   memcg_subgroup_charge 1 TINFO: Process is still here after warm up: 119041
   memcg_subgroup_charge 1 TPASS: rss is 135168 as expected
   memcg_subgroup_charge 2 TPASS: rss is 0 as expected
   memcg_subgroup_charge 3 TINFO: Starting test 2
   /opt/ltp/testcases/bin/memcg_subgroup_charge.sh: 522: echo: echo: I/O error
   memcg_subgroup_charge 3 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
   memcg_subgroup_charge 3 TINFO: Running memcg_process --mmap-anon -s 135168
   memcg_subgroup_charge 3 TINFO: Warming up pid: 119071
   memcg_subgroup_charge 3 TINFO: Process is still here after warm up: 119071
   memcg_subgroup_charge 3 TFAIL: rss is 0, 135168 expected
   memcg_subgroup_charge 4 TPASS: rss is 0 as expected
   memcg_subgroup_charge 5 TINFO: Starting test 3
   /opt/ltp/testcases/bin/memcg_subgroup_charge.sh: 522: echo: echo: I/O error
   memcg_subgroup_charge 5 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
   memcg_subgroup_charge 5 TINFO: Running memcg_process --mmap-anon -s 135168
   memcg_subgroup_charge 5 TINFO: Warming up pid: 119094
   memcg_subgroup_charge 5 TINFO: Process is still here after warm up: 119094
   memcg_subgroup_charge 5 TPASS: rss is 135168 as expected
   memcg_subgroup_charge 6 TPASS: rss is 0 as expected

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