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[Bug 1519647] Re: [Bug]intel_pstate: divide by zero do to same mperf

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Leann Ogasawara <leann.ogasawara@xxxxxxxxxxxxx>
Date: Thu, 17 Mar 2016 20:01:15 -0000
Reply-to: Bug 1519647 <1519647@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Information type changed from Proprietary to Public

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

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

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

** Changed in: intel
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1519647

Title:
  [Bug]intel_pstate: divide by zero do to same mperf

Status in intel:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  On KNL, very rarely, it may happen that mperf read twice in a row has
  the same value. It results in kernel panic due to divide by zero

  Platform: KNL

  This is fixed in 4.3 kernel with:
  8e601a9 cpufreq: intel_pstate: Fix divide by zero on Knights Landing (KNL)

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