linux-kernel - Re: frequent lockups in 3.18rc4

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Date:	Fri, 5 Dec 2014 12:15:01 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Chris Mason <clm@...com>,
	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 03, 2014 at 10:45:57AM -0800, Linus Torvalds wrote:
 > 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.

A bisect later, and I landed on a kernel that ran for a day, before
spewing NMI messages, recovering, and then..

http://codemonkey.org.uk/junk/log.txt

I could log in, but every command I tried (even shell built-ins) just printed 'bus error'.

I saw those end_request messages in an earlier bisect, I wonder if there
was an actual bug that got fixed where allowed non-root to try and do
bad things to raw devices. It's always sector 0 too.

Yet again, I'm wondering if this whole thing is just signs of early hardware death.

	Dave

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