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[Kleber Sacilotto de Souza <1809701@xxxxxxxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1809701

Title:
  cpu_hotplug test in ubuntu_kernel_selftest failed on Moonshot ARM64

Status in ubuntu-kernel-tests:
  Triaged
Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Xenial:
  New
Status in linux source package in Bionic:
  New
Status in linux source package in Disco:
  Won't Fix

Bug description:
  Test failed with "Operation not supported" when trying to offline a CPU:
      echo 0 > $SYSFS/devices/system/cpu/cpu$1/online

  This issue cannot be reproduced on CaviumThunderX ARM64 server, just
  the moonshots.

  $ sudo make -C linux/tools/testing/selftests TARGETS=cpu-hotplug run_tests
  make: Entering directory '/home/ubuntu/linux/tools/testing/selftests'
  make[1]: Entering directory '/home/ubuntu/linux/tools/testing/selftests/cpu-hotplug'
  make[1]: Nothing to be done for 'all'.
  make[1]: Leaving directory '/home/ubuntu/linux/tools/testing/selftests/cpu-hotplug'
  make[1]: Entering directory '/home/ubuntu/linux/tools/testing/selftests/cpu-hotplug'
  TAP version 13
  selftests: cpu-hotplug: cpu-on-off-test.sh
  ========================================
  pid 8132's current affinity mask: ff
  pid 8132's new affinity mask: 1
  CPU online/offline summary:
  	 Cpus in online state: 0-7
  	 Cpus in offline state: 0
  Limited scope test: one hotplug cpu
  	 (leaves cpu in the original state):
  	 online to offline to online: cpu 7
  ./cpu-on-off-test.sh: line 92: echo: write error: Operation not supported
  offline_cpu_expect_success 7: unexpected fail
  not ok 1..1 selftests: cpu-hotplug: cpu-on-off-test.sh [FAIL]
  make[1]: Leaving directory '/home/ubuntu/linux/tools/testing/selftests/cpu-hotplug'
  make: Leaving directory '/home/ubuntu/linux/tools/testing/selftests'

  The CPU hotplug config was enabled on this SUT:
  $ cat /boot/config-`uname -r` | grep HOTPLUG | grep CPU
  CONFIG_HOTPLUG_CPU=y
  CONFIG_ACPI_HOTPLUG_CPU=y
  # CONFIG_CPU_HOTPLUG_STATE_CONTROL is not set

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.18.0-13-generic 4.18.0-13.14
  ProcVersionSignature: User Name 4.18.0-13.14-generic 4.18.17
  Uname: Linux 4.18.0-13-generic aarch64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Dec 25 04:01 seq
   crw-rw---- 1 root audio 116, 33 Dec 25 04:01 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: arm64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Tue Dec 25 04:54:54 2018
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  PciMultimedia:
   
  ProcFB:
   
  ProcKernelCmdLine: console=ttyS0,9600n8r ro
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-13-generic N/A
   linux-backports-modules-4.18.0-13-generic  N/A
   linux-firmware                             1.175.1
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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