linux-kernel - Re: Intermittent early panic in try_to_wake

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Date:	Sat, 07 Nov 2009 17:35:54 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kevin Winchester <kjwinchester@...il.com>
Cc:	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: Intermittent early panic in try_to_wake_up

On Sat, 2009-11-07 at 12:24 -0400, Kevin Winchester wrote:
> Mike Galbraith wrote:
> > On Fri, 2009-11-06 at 19:49 -0400, Kevin Winchester wrote:
> > 
> >> The patch below does not apply to mainline, unless I'm doing something wrong.
> >> It's against -tip, I assume?  Is it just as applicable to mainline?
> > 
> > It was mainline, but I had the scheduler pull request and another in for
> > testing as well.  Linus has pulled, so it'll apply now, with offsets.
> > 
> 
> It did end up applying, but did not have any effect.  Looking at the patch
> again, I see that it appears to only affect CONFIG_SMP, which I am not
> running (and in fact it adds a build warning for the !SMP case).  So there
> was not much chance of it fixing anything, I suppose.
> 
> Any other ideas?  I don't have a serial console, and the trace scrolls off
> my console, so I don't know if any debug printks would help.  Would it help
> if I copied the entire panic message entirely, including the Code section?
> I can try that the next time it happens.

Use vga=ask boot_delay=100 select the highest res possible.

Possibly you could use a digital (video) camera to record the output.

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