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Date: Tue, 27 Jul 2004 11:26:16 -0400
From: Jeff Garzik <jgarzik@pobox.com>
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To: Dominik Karall <dominik.karall@gmx.net>
CC: Linux Kernel ML <linux-kernel@vger.kernel.org>,
       Daniele Venzano <webvenza@libero.it>
Subject: Re: SiS900: NULL pointer encountered in Rx ring, skipping
References: <200407232052.06616.dominik.karall@gmx.net>
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Dominik Karall wrote:
> After a few hours my network doesn't work on my laptop. There appear a lot of 
> those messages:
> 
> eth0: NULL pointer encountered in Rx ring, skipping
> eth0: NULL pointer encountered in Rx ring, skipping
> eth0: NULL pointer encountered in Rx ring, skipping
> eth0: NULL pointer encountered in Rx ring, skipping
> eth0: NULL pointer encountered in Rx ring, skipping
> eth0: NULL pointer encountered in Rx ring, skipping
> eth0: NULL pointer encountered in Rx ring, skipping
> eth0: NULL pointer encountered in Rx ring, skipping
> eth0: NULL pointer encountered in Rx ring, skipping
> eth0: NULL pointer encountered in Rx ring, skipping
> 
> It works again after restarting network. I'm using 2.6.8-rc2 now. It was the 
> same problem in 2.6.7, but I didn't test it with earlier kernels.

A NULL appears when the machine is temporarily unable to allocate room 
for a new skb.  Your machine's atomic memory pools are getting too low...

	Jeff