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Date: Fri, 14 Sep 2001 11:37:57 -0700
From: Andrew Morton <akpm@zip.com.au>
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To: Matthias Haase <matthias_haase@bennewitz.com>
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Subject: Re: repeatable SMP lockups - kernel 2.4.9
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Matthias Haase wrote:
> 
> Our new SMP file- and printserver locks always hard up, if higher load
> come on the NIC. True stable without networking (X11, DRI
> 

Have you tried enabling the NMI watchdog?  Boot with the

	nmi_watchdog=1

LILO option.