Re: [BUG]linux-2.4.26 Quad-Opteron: panic when init scsi

[Marcelo Tosatti]

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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