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Re: [PATCH] kernel/watchdog: fix spurious hard lockups

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On Tue, Jun 20, 2017 at 06:34:23PM -0400, Prarit Bhargava wrote:
> 
> 
> On 06/20/2017 05:33 PM, kan.liang@intel.com wrote:
> > From: Kan Liang <Kan.liang@intel.com>
> > 
> > Some users reported spurious NMI watchdog timeouts.
> > 
> > We now have more and more systems where the Turbo range is wide enough
> > that the NMI watchdog expires faster than the soft watchdog timer that
> > updates the interrupt tick the NMI watchdog relies on.
> > 
> 
> Hmm ... odd that I haven't seen this.  We're running a pretty wide
> variety of systems here.  Do you have a reproducer?  I'd like to see
> this occur on production HW.

It only happens on a few specific CPU SKUs with a very wide Turbo range.
Reproducer is typically some stress workload that turbos very high.

-Andi

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[PATCH] kernel/watchdog: fix spurious hard lockups kan.liang@intel.com - 2017-06-20 23:40 +0200
  Re: [PATCH] kernel/watchdog: fix spurious hard lockups Andrew Morton <akpm@linux-foundation.org> - 2017-06-21 00:10 +0200
    RE: [PATCH] kernel/watchdog: fix spurious hard lockups "Liang, Kan" <kan.liang@intel.com> - 2017-06-21 14:50 +0200
      Re: [PATCH] kernel/watchdog: fix spurious hard lockups Don Zickus <dzickus@redhat.com> - 2017-06-21 15:50 +0200
        RE: [PATCH] kernel/watchdog: fix spurious hard lockups "Liang, Kan" <kan.liang@intel.com> - 2017-06-21 16:20 +0200
  Re: [PATCH] kernel/watchdog: fix spurious hard lockups Prarit Bhargava <prarit@redhat.com> - 2017-06-21 00:40 +0200
    Re: [PATCH] kernel/watchdog: fix spurious hard lockups Andi Kleen <ak@linux.intel.com> - 2017-06-21 01:10 +0200
      Re: [PATCH] kernel/watchdog: fix spurious hard lockups Prarit Bhargava <prarit@redhat.com> - 2017-06-21 02:20 +0200
        Re: [PATCH] kernel/watchdog: fix spurious hard lockups Marc Herbert <Marc.Herbert@intel.com> - 2017-06-21 23:10 +0200
  Re: [PATCH] kernel/watchdog: fix spurious hard lockups Don Zickus <dzickus@redhat.com> - 2017-06-21 15:50 +0200
    RE: [PATCH] kernel/watchdog: fix spurious hard lockups "Liang, Kan" <kan.liang@intel.com> - 2017-06-21 16:10 +0200
  Re: [PATCH] kernel/watchdog: fix spurious hard lockups Michal Hocko <mhocko@kernel.org> - 2017-06-28 13:50 +0200
    RE: [PATCH] kernel/watchdog: fix spurious hard lockups "Liang, Kan" <kan.liang@intel.com> - 2017-06-28 15:30 +0200
      RE: [PATCH] kernel/watchdog: fix spurious hard lockups "Liang, Kan" <kan.liang@intel.com> - 2017-06-28 16:40 +0200
      Re: [PATCH] kernel/watchdog: fix spurious hard lockups Michal Hocko <mhocko@kernel.org> - 2017-06-28 16:40 +0200

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