group.of.nepali.translators team mailing list archive

[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Zesty)
   Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
       Status: New

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

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

** Changed in: linux (Ubuntu Zesty)
       Status: New => Fix Released

** Changed in: linux (Ubuntu Zesty)
     Assignee: Taco Screen team (taco-screen-team) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Xenial)
       Status: New => In Progress

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Yakkety)
       Status: New => In Progress

** Changed in: linux (Ubuntu Yakkety)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

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https://bugs.launchpad.net/bugs/1662666

Title:
  ISST-LTE:pNV: ppc64_cpu command is hung w HDs, SSDs and NVMe

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Yakkety:
  In Progress
Status in linux source package in Zesty:
  Fix Released

Bug description:
  -- Problem Description --
  The following upstream patches are needed for Ubuntu to fix a hang situation reported when executing ppc64_cpu --smt=on that occurs with various disk types. We need whichever ones have not yet been pulled into the base.

  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e57690fe009b2ab0cee8a57f53be634540e49c9d
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0e87e58bf60edb6bb28e493c7a143f41b091a5e5
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=135e8c9250dd5c8c9aae5984fde6f230d0cbfeaf
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c02ebfdddbafa9a6a0f52fbd715e6bfa229af9d3
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d1b1cea1e58477dad88ff769f54c0d2dfa56d923
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=36e1f3d107867b25c616c2fd294f5a1c9d4e5d09
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=71f79fb3179e69b0c1448a2101a866d871c66e7f

  The hang problem can be reproduced with the following shell script
  using an NVMe device executed on kernel versions 4.4.0-45 and 4.4.0-59
  within 30 minutes. It was also reproduced on a 4.8.0-32-generic
  kernel, although it took over 3 hours to manifest.

  #!/bin/bash

  if [[ ${#} -eq 0 ]]; then
          ${0} breaker &
          while true; do
                  dd if=/dev/nvme0n1 bs=1024k of=/dev/null
          done
  elif [[ ${1} == "breaker" ]]; then
          while true; do
                  ppc64_cpu --smt=off
                  sleep 5
                  ppc64_cpu --smt=on
                  sleep 5
          done
  fi

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