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Date: Tue, 7 Dec 2004 00:31:00 +0100
From: Arjan Van Leeuwen <avleeuwen@gmail.com>
To: Jeff Behl <jbehl@fastclick.com>
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cc: freebsd-stable@freebsd.org
Subject: Re: reproducible kernel panic
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On Mon, 06 Dec 2004 13:19:54 -0800, Jeff Behl <jbehl@fastclick.com> wrote:
> I'm getting a kernel panic every time I start getting traffic (~ 20Mb/s
> total) to two squid processes.  This was not happening with -RELEASE.  I
> upgraded on the advice that STABLE would decrease the %cpu spent in
> system, which was much higher than that spent in user.  The machine's
> only fucntion is as a reverse proxy (2 separate squid processes to take
> advante of both cpus).
> 
> Let me know if a dump would be helpful, or if there's anything I can do
> to help.
> 
> Dual AMD Opteron system..
> 
> Jeff
> ps.  I don't believe the problem is with a zebra/ospfd kernel
> interaction.  the open port RST responses are expected; i can explain
> why if it would provide insight into the problem...
> 

I had a panic that looked a lot like this (panic in swi, came up when
I had some network traffic), and it's also been reported by other
people than me. Turning of SACK seems to work for most people (at
least it worked for me). Put net.inet.tcp.sack.enable=0 in
/etc/sysctl.conf.

Arjan