Public bug reported:

<<<test_output>>>
incrementing stop
Name:   cpuhotplug03
Date:   Thu Jul 11 08:31:48 UTC 2019
Desc:   Do tasks get scheduled to a newly on-lined CPU?

CPU is 1
sh: echo: I/O error
cpuhotplug03 1 TBROK: CPU1 cannot be offlined
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root      4642  0.0  0.0   2020   488 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4643  0.0  0.0   2020   480 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4644  0.0  0.0   2020   468 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4645  0.0  0.0   2020   488 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4646  0.0  0.0   2020   472 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4647  0.0  0.0   2020   480 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4648  0.0  0.0   2020   456 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4649  0.0  0.0   2020   508 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4650  0.0  0.0   2020   488 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4651  0.0  0.0   2020   472 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4652  0.0  0.0   2020   484 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4653  0.0  0.0   2020   496 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4654  0.0  0.0   2020   464 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4655  0.0  0.0   2020   492 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4656  0.0  0.0   2020   448 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4657  0.0  0.0   2020   472 pts/0    R    08:31   0:00 /bin/sh 
/opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
root      4661  0.0  0.0   7540   648 pts/0    S    08:31   0:00 grep 
cpuhotplug_do_spin_loop
cpuhotplug03 1 TINFO: Onlining CPU 1
  7 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  1 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  4 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  0 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  3 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  6 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  1 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  5 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  3 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  7 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  6 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  2 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  4 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  2 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  0 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
  5 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
cpuhotplug03 1 TPASS: 2 cpuhotplug_do_spin_loop processes found on      CPU1
<<<execution_status>>>
initiation_status="ok"
duration=1 termination_type=exited termination_id=2 corefile=no
cutime=1060 cstime=9
<<<test_end>>>


Test passed on ThunderX ARM64, probably a test case issue.


Steps to run this test:
  git clone --depth=1 https://github.com/linux-test-project/ltp.git
  cd ltp; make autotools; ./configure; make; sudo make install
  echo "cpuhotplug03 cpuhotplug03.sh -c 1 -l 1" > /tmp/jobs
  sudo /opt/ltp/runltp -f /tmp/jobs

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.18.0-25-generic 4.18.0-25.26
ProcVersionSignature: User Name 4.18.0-25.26-generic 4.18.20
Uname: Linux 4.18.0-25-generic aarch64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116,  1 Jul 11 06:57 seq
 crw-rw---- 1 root audio 116, 33 Jul 11 06:57 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.10-0ubuntu13.4
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: Thu Jul 11 08:22:51 2019
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-4.18.0-25-generic N/A
 linux-backports-modules-4.18.0-25-generic  N/A
 linux-firmware                             1.175.6
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu-kernel-tests
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Cosmic)
     Importance: Undecided
         Status: New


** Tags: apport-bug arm64 cosmic sru-20190701 ubuntu-ltp uec-images

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

** Also affects: ubuntu-kernel-tests
   Importance: Undecided
       Status: New

** Tags added: sru-20190701 ubuntu-ltp

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https://bugs.launchpad.net/bugs/1836167

Title:
  cpuhotplug03 in cpuhotplug from ubuntu_ltp failed on C Moonshot ARM64

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