Date: Wed, 28 Apr 2004 20:13:20 -0300
From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: Juergen Stohr <juergen.stohr@lpr.e-technik.tu-muenchen.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [BUG]linux-2.4.26 Quad-Opteron: panic when init scsi
Message-ID: <20040428231320.GA16387@logos.cnet>
References: <20040427101720.GA27663@rcs.ei.tum.de>
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On Tue, Apr 27, 2004 at 12:17:20PM +0200, Juergen Stohr wrote:
> Hi,
> 
> I have got a problem similar to the one discussed in the thread
> "[BUG]linux-2.4.24 with k8 numa support panic when init scsi": When 
> booting the 2.4.26 on a quad Opteron box, in most of the cases the 
> kernel crashes when initializing SCSI.
> It seems to me that this bug is caused by a race, as in a few
> cases the machine is able to boot.
> 
> The machine always boots if I set maxcpus=1.
> 
> If I append numa=off to the command line the kernel crashes with a
> "Machine Check Exception" (but is able to initialize SCSI; perhaps
> this is another bug?)
> 
> Does anybody know how to solve this problem or is anybody working on it?
> Can someone give me a hint where to start when debugging this race?
> 
> I will attach the config of my kernel, the syslogs and the output of
> ksymoops.

Andi,

Have you seen Juergen's ksymoops trace? 

It seems some BUG() (maybe BAD_RANGE()) is triggering at startup in 
__alloc_pages().

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