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

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Date:	Sun, 2 Mar 2008 12:00:10 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Marcin Slusarz <marcin.slusarz@...il.com>
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, 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...


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