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[Jürg Häfliger <1923191@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1836167 ***
    https://bugs.launchpad.net/bugs/1836167

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1923191

Title:
  cpuhotplug from ubuntu_ltp failed for  cpuhotplug02 cpuhotplug03
  cpuhotplug04 cpuhotplug06

Status in ubuntu-kernel-tests:
  In Progress
Status in linux-azure package in Ubuntu:
  New
Status in linux-azure-4.15 package in Ubuntu:
  New
Status in linux-azure source package in Trusty:
  New
Status in linux-azure-4.15 source package in Trusty:
  New
Status in linux-azure source package in Xenial:
  New
Status in linux-azure-4.15 source package in Xenial:
  New
Status in linux-azure source package in Bionic:
  New
Status in linux-azure-4.15 source package in Bionic:
  New

Bug description:
  cpuhotplug02:

      Name: cpuhotplug02
      Date: Tue Mar 30 13:32:56 UTC 2021
      Desc: What happens to a process when its CPU is offlined?

      CPU is 1
      sh: echo: I/O error
      cpuhotplug02 1 TFAIL: process did not change from CPU 1
      tag=cpuhotplug02 stime=1617111176 dur=5 exit=exited stat=1 core=no cu=2 cs=2
      startup='Tue Mar 30 13:33:06 2021'

  
  cpuhotplug03:

      Name: cpuhotplug03
      Date: Tue Mar 30 13:33:06 UTC 2021
      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 20613 0.0 0.0 4636 864 ? R 13:33 0:00 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
      root 20614 0.0 0.0 4636 812 ? R 13:33 0:00 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
      root 20615 0.0 0.0 4636 812 ? R 13:33 0:00 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
      root 20616 0.0 0.0 4636 880 ? R 13:33 0:00 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
      root 20620 0.0 0.0 14864 1092 ? S 13:33 0:00 grep cpuhotplug_do_spin_loop
      cpuhotplug03 1 TINFO: Onlining CPU 1
      1 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
      1 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
      0 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
      0 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop
      cpuhotplug03 1 TPASS: 2 cpuhotplug_do_spin_loop processes found on CPU1
      tag=cpuhotplug03 stime=1617111186 dur=2 exit=exited stat=2 core=no cu=242 cs=38
      startup='Tue Mar 30 13:33:08 2021'

  
  cpuhotplug04:

      Name: cpuhotplug04
      Date: Tue Mar 30 13:33:08 UTC 2021
      Desc: Does it prevent us from offlining the last CPU?

      sh: echo: I/O error
      cpuhotplug04 1 TFAIL: Could not offline cpu1
      tag=cpuhotplug04 stime=1617111188 dur=0 exit=exited stat=1 core=no cu=4 cs=4
      startup='Tue Mar 30 13:33:08 2021'

  
  cpuhotplug06

      Name: cpuhotplug06
      Date: Tue Mar 30 13:33:08 UTC 2021
      Desc: Does top work properly when CPU hotplug events occur?

      CPU is 1
      sh: echo: I/O error
      cpuhotplug06 1 TBROK: CPU1 cannot be offlined
      20913 ? 00:00:00 top
      tag=cpuhotplug06 stime=1617111188 dur=1 exit=exited stat=2 core=no cu=2 cs=3
      startup='Tue Mar 30 13:33:15 2021'

  
  http://10.246.72.46/4.15.0-1112.125-azure/bionic-linux-azure-4.15-azure-amd64-4.15.0-Basic_A2-ubuntu_ltp/ubuntu_ltp/results/ubuntu_ltp.cpuhotplug/debug/ubuntu_ltp.cpuhotplug.DEBUG.html

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