linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141217111307.GD3337@twins.programming.kicks-ass.net>
Date:	Wed, 17 Dec 2014 12:13:07 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>, Chris Mason <clm@...com>,
	Dâniel Fraga <fragabr@...il.com>,
	Dave Jones <davej@...hat.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 Tue, Dec 02, 2014 at 08:33:53AM -0800, Linus Torvalds wrote:
> On Tue, Dec 2, 2014 at 6:13 AM, Mike Galbraith <umgwanakikbuti@...il.com> wrote:
> >
> > The bean counting problem below can contribute.
> >
> > https://lkml.org/lkml/2014/3/30/7
> 
> Hmm. That never got applied. I didn't apply it originally because of
> timing and wanting clarifications, but apparently it never made it
> into the -tip tree either.
> 
> Ingo, PeterZ - comments?

My comment at the time was:

https://lkml.org/lkml/2014/4/8/295

Of course that debug patch doesn't apply anymore. But we've had so many
fails with that skip_clock_update thing that we need more than yet
another fudge without real means of validating stuff.

I'll go see if I can get that debug infra back up.

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