[Bug 1765460] Re: [opal-prd] opal-prd is consuming 100% CPU

Mon Apr 23 19:41:31 UTC 2018

This bug was fixed in the package skiboot - 5.10~rc4-1ubuntu1

---------------
skiboot (5.10~rc4-1ubuntu1) bionic; urgency=medium

  * debian/patches/0001-opal-prd-Insert-powernv_flash-module.patch:
    cherry-pick from upstream to fix opal-prd spinning and consuming 100%
    CPU if it starts on boot before the mtd module has been loaded.
    LP: #1765460.

 -- Steve Langasek <steve.langasek at ubuntu.com>  Mon, 23 Apr 2018
09:50:43 -0700

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

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https://bugs.launchpad.net/bugs/1765460

Title:
  [opal-prd]  opal-prd is consuming 100% CPU

Status in The Ubuntu-power-systems project:
  Triaged
Status in skiboot package in Ubuntu:
  Fix Released

Bug description:
  ---Problem Description---
  opal-prd fix for Ubuntu 18.04

   In some corner cases where opal-prd fails to access/read flash device (/dev/mtd0) we see opal-prd consuming 100% cpu. This mostly happens during boot time where opal-prd daemon tries to start even before mtd driver loaded.   Its not easy to reproduce. It happens randomly.

  ---uname output---
  Ubuntu 18.04

  Machine Type = OpenPower System 

  Userspace tool common name: opal-prd 

  Below upstream patch will fix this issue.

  commit cb16e55a234b91fd42112904cff15094fbae680d
  Author: Vasant Hegde <hegdevasant at linux.vnet.ibm.com>
  Date:   Tue Apr 3 23:08:41 2018 +0530

      opal-prd: Insert powernv_flash module

      Explictly load powernv_flash module on BMC based system so that we are sure
      that flash device is created before starting opal-prd daemon.

  -Vasant

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