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Re: [kdb] KDB makes Nehalem hang at early boot until key press

To: Martin Hicks <mort@xxxxxxx>
Subject: Re: [kdb] KDB makes Nehalem hang at early boot until key press
From: Thomas Renninger <trenn@xxxxxxx>
Date: Fri, 30 Oct 2009 17:19:46 +0200
Cc: kdb@xxxxxxxxxxx
In-reply-to: <20091030142644.GE10537@xxxxxxxxxxxxxxxxxxxxxxxxx>
Organization: SUSE Products GmbH
References: <200910301102.57634.trenn@xxxxxxx> <200910301512.06384.trenn@xxxxxxx> <20091030142644.GE10537@xxxxxxxxxxxxxxxxxxxxxxxxx>
User-agent: KMail/1.10.3 (Linux/2.6.27.29-0.1-default; KDE/4.1.3; x86_64; ; )
On Friday 30 October 2009 15:26:44 Martin Hicks wrote:
> 
> On Fri, Oct 30, 2009 at 04:12:06PM +0200, Thomas Renninger wrote:
> > 
> > > > IMO something like the attached patch makes sense?
> > > > This fixes the problem with kdb=off (our default).
> > > > But I am anxious that kdb code could still get activitated somehow
> > > > and the machine might oops when trying to access not initialized
> > > > kdb structures? Could someone give an estimation how risky that
> > > > patch really is?
> > > 
> > > I'd really rather fix the underlying problem.  I have no idea what that
> > > might be though...
> > Me too...
> 
> Can you send me the .config you're using, as well as the kernel
> revision?  I'll try to duplicate it.
config attached.
This is a SLES11 kernel, you can get the sources here:
ftp://ftp.suse.com/pub/projects/kernel/kotd/SLE11_BRANCH/x86_64/kernel-source.rpm

> Can you try turning of CONFIG_KDB_USB if you have it enabled?
Tried that, it does not help.

Thanks a lot!

  Thomas

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