linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <CA+55aFzLprvtdLGDXgRr=k3QqO824uQSzbxT-b4vu_4pryMtSA@mail.gmail.com>
Date:	Wed, 3 Dec 2014 10:45:57 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dave Jones <davej@...hat.com>, Chris Mason <clm@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dâniel Fraga <fragabr@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On Wed, Dec 3, 2014 at 10:41 AM, Dave Jones <davej@...hat.com> wrote:
>
> I've been stuck on this kernel for a few days now trying to prove it
> good/bad one way or the other, and I'm leaning towards good, given
> that it recovers, even though the traces look similar.

Ugh. But this does *not* happen with 3.16, right? Even the non-fatal case?

If so, I'd be inclined to call it "bad". But there might well be two
bugs: one that makes that NMI watchdog trigger, and another one that
then makes it be a hard lockup. I'd think it would be good to figure
out the "NMI watchdog starts triggering" one first, though.

                 Linus
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