linux-kernel - Re: [2.6.23-rc8-mm2] System hangs (loops?) during boot

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Message-ID: <20070930154424.68e4218e@laptop.hypervisor.org>
Date:	Sun, 30 Sep 2007 15:44:24 +0200
From:	"Udo A. Steinberg" <us15@...inf.tu-dresden.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Frans Pop <elendil@...net.nl>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [2.6.23-rc8-mm2] System hangs (loops?) during boot

On Sat, 29 Sep 2007 13:02:34 -0700 Andrew Morton (AM) wrote:

AM> On Sat, 29 Sep 2007 21:40:22 +0200 Frans Pop <elendil@...net.nl> wrote:
AM> 
AM> > On Saturday 29 September 2007, you wrote:
AM> > > On Sat, 29 Sep 2007 02:32:44 +0200 Frans Pop <elendil@...net.nl>
AM> > > wrote:
AM> > > > On Friday 28 September 2007, Frans Pop wrote:
AM> > > > > My Toshiba Satellite A40 (i386, P4 Mobile) hangs during boot
AM> > > > > after: Marking TSC unstable due to: possible TSC halt in C2.
AM> > > > > Time: acpi_pm clocksource has been installed.
AM> > > >
AM> > > > A few new boot attempts show the problem is more likely at:
AM> > > > Probing IDE interface ide0...
AM> > 
AM> > Looks like it is both: hpet killing IDE?
AM> > 
AM> > > Two iterations should get you into the culprit zone.
AM> > 
AM> > Thanks for the pointers. Luckily I ended up in a quite narrow zone
AM> > between two of the points you indicated (10 iterations).
AM> > 
AM> > And the winner is:
AM> > 
AM> > 3fe6c0016fd863b233097a8219a0d8577c2fd503 is first bad commit
AM> > commit 3fe6c0016fd863b233097a8219a0d8577c2fd503
AM> > Author: Udo A. Steinberg <...>
AM> >     hpet-force-enable-on-ich34
AM> > 
AM> > Guess the comments about thin ice and testing were justified :-)
AM> > 
AM> > lspci and a 2.6.23-rc6 dmesg for this system can be found in:
AM> > http://lkml.org/lkml/2007/9/19/300
AM> 
AM> Great, thanks for doing that.
AM> 
AM> I guess I'll drop the patch for now in that case.

I somehow doubt that the HPET patch itself is the culprit. In fact, the
reason it shows up on git-bisect is probably because without it HPET
functionality is not enabled on the platform. So the problem could really
be anywhere in the HPET-driven timer infrastructure.

Frans, could you try out the -hrt patchset from Thomas Gleixner and see
if that works? Also, what ICH does your platform have? ICH3 or ICH4?

Cheers,

	- Udo

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