linux-kernel - Re: 2.6.25-rc: complete lockup on boot/start of X (bisected)

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Date:	Sun, 2 Mar 2008 21:08:05 +0100
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.25-rc: complete lockup on boot/start of X (bisected)

On Sun, Mar 02, 2008 at 12:00:10PM -0800, Arjan van de Ven wrote:
> On Sun, 2 Mar 2008 20:00:05 +0100
> Marcin Slusarz <marcin.slusarz@...il.com> wrote:
> 
> > Hi
> > Since early 2.6.25 days I'm having strange lockup on boot. As it
> > happens rarely (in ~10% of boots), I couldn't bisect it. No kernel
> > panic, SysRq didn't work, so I couldn't provide any useful
> > informations to LK community. I hoped someone else would fix it... :)
> > 
> > It's rc3 so I decided to narrow it down myself. I enabled netconsole 
> > to see whether some other informations are printed before lockup.
> > It didn't help, but I noticed that lockup happens much more
> > frequenly! (~50%) So I bisected it down to:
> > 
> > 8f4d37ec073c17e2d4aa8851df5837d798606d6f is first bad commit
> > commit 8f4d37ec073c17e2d4aa8851df5837d798606d6f
> > Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > Date:   Fri Jan 25 21:08:29 2008 +0100
> > 
> >     sched: high-res preemption tick
> > 
> >     Use HR-timers (when available) to deliver an accurate preemption
> > tick.
> 
> 
> the only unusual/suspect thing you have is nvidiafb driver; that's not very commonly used.
> Can you do a quick try with that thing disabled? Maybe it has some races that are more likely
> to trigger after this patch...
I switched from vesa to nvidiafb few days ago. Lockup started to happen earlier.

Marcin
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