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

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Message-ID: <4718a252-9515-626e-a69f-565f1c2bc589@redhat.com>
Date:   Tue, 20 Jun 2017 18:34:23 -0400
From:   Prarit Bhargava <prarit@...hat.com>
To:     kan.liang@...el.com, linux-kernel@...r.kernel.org
Cc:     dzickus@...hat.com, mingo@...nel.org, akpm@...ux-foundation.org,
        babu.moger@...cle.com, atomlin@...hat.com,
        torvalds@...ux-foundation.org, peterz@...radead.org,
        tglx@...utronix.de, eranian@...gle.com, acme@...hat.com,
        ak@...ux.intel.com, stable@...r.kernel.org
Subject: Re: [PATCH] kernel/watchdog: fix spurious hard lockups



On 06/20/2017 05:33 PM, kan.liang@...el.com wrote:
> From: Kan Liang <Kan.liang@...el.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.

P.