fxp(4) and lockups on RELENG_6_x

[Kris Kennaway]

On Sun, Jan 07, 2007 at 04:52:29PM +0100, Krzysztof Kowalik wrote:
> Hello.
> 
> We are running an (IRC) server that under high-rate traffic (ie. DDoS
> attack) stops to respond to the network. The network remains locked up
> even after the original attack stops. However running tcpdump (which
> switches the interface into promisc mode) unlocks networking and things
> work again.
> 
> At the moment, we are running 6.2-RC1 cvsupped at Dec 10, with if_fxp.c
> from Nov 11 (previously, we had 6.1 for a while, having the same issues)
> 
> if_fxp.c,v 1.240.2.10.2.1 2006/11/20 16:21:12
> 
> The same machine used to run FreeBSD 4.11 without any problems.
> 
> Any help/pointers/suggestions would be appreciated.

You'll probably need to set up DDB and run the usual tracing commands
(see the developers handbook) to obtain further debugging information
to proceed here.

Kris
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