linux-kernel - Re: [regression bisected] HR-timers bug >=2.6.25

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Date:	Fri, 16 May 2008 10:26:10 -0700
From:	Justin Madru <jdm64@...ab.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [regression bisected] HR-timers bug >=2.6.25

Peter Zijlstra wrote:
> The kernel doesn't hang, right? My reading of the description tells me
> the splash just doesn't work.
>
> If it does hang the kernel, an NMI trace collected over serial or
> netconsole (regular console being out of the question since its
> graphical stuff :/) would be most helpful.

I've seen it blank out in 2 different ways.

1) Usplash completely finishes. Then screen goes blank for the usual mode change/screen refreshing,
doing several refreshes of a blank screen. But, the screen then stays black.
I do still hear the gdm sound, and can switch to a console.
Pressing ctrl+alt+f1 makes the screen "refresh" again, but stay blank/black. I can still login but blindly.

2) More rarely. Usplash hasn't finished (but near the end). The usplash screen fades out to black.
It's like a screen burn in, or after image; the screen slowly fades out to black.
After this the computer is _seemingly_unresponsive_ - Only alt+sysrq+b seems to work. (I have to hard reset)
After I reboot the backlight is at the lowest level.

Anyways, I think I can figure out how to set up a netconsole, but
is there something more to setup a NMI trace? I found Documentation/networking/netconsole.txt
But, it doesn't say anything about a NMI trace.

Justin

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