netdev - Kernel Panic every 2 weeks on ISP server (NULL pointer dereference)

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Date:	Sat, 22 Oct 2011 22:18:12 -0300
From:	Luciano Ruete <lruete@...ure.com.ar>
To:	netdev@...r.kernel.org
Subject: Kernel Panic every 2 weeks on ISP server (NULL pointer dereference)

Hi,

I'm the sysadmin at a 3500 customers ISP, wich runs an iptables+tc solution 
for load balancing and QoS.

Every 2 or 3 weeks the server panics with a "NULL pointer dereference" and 
with IP at "dev_queue_xmit"

It is curious that if i disable MSI on the network card driver this panics 
seems to disapear, does this ring a bell?

The server is an IBM, previously with Broadcom NetXtreme II BCM5709 nics and 
now with Intel 82576. I change the nics thinking that maybe the bug was in 
Broadcom Driver but it seems to affect MSI in general.

The tc+iptables rules are auto-generated with sequreisp[1] an ISP solution 
that i wrote and is open sourced under AGPLv3.

Tell me if you need any further information, and plz CC because I'm not 
suscribed. 

root@...ver:~# uname -a
Linux server 2.6.35-30-server #60~lucid1-Ubuntu SMP Tue Sep 20 22:28:40 UTC 
2011 x86_64 GNU/Linux

[1]https://github.com/sequre/sequreisp

-- 
Luciano Ruete
Sequre - Sys Admin
Mitre 617, piso 7, of. 1 
+54 261 4254894
Mendoza - Argentina
http://www.sequre.com.ar/
http://www.sequreisp.com/

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