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

From Michal Hocko <mhocko@kernel.org>
Newsgroups linux.kernel
Subject Re: [PATCH] kernel/watchdog: fix spurious hard lockups
Date 2017-06-28 13:50 +0200
Message-ID <tXjDP-6i4-5@gated-at.bofh.it> (permalink)
References <tUz2p-5x0-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tue 20-06-17 14:33:09, 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.

AFAIR the watchdog doesn't rely on deferred timers so this would suggest
that a standard hrtimer can expire much later than programmed, right?
If that is the case how come other parts of the system do not break. We
do rely on hrtimers on many other places?
-- 
Michal Hocko
SUSE Labs

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Thread

[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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