From owner-freebsd-net@FreeBSD.ORG  Wed Apr 15 18:09:22 2009
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Date: Wed, 15 Apr 2009 21:30:53 +0400
From: Alexey Lukashin <alexey-lukashin@yandex.ru>
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Subject: Netgraph. panic in kernel
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Hi all,

I'm studying how Netgraph system works and trying to write my own 
netgraph node similar to ng_bridge.
It catches packets from lower ng_ether hooks and transmits it to other 
interfaces using mac address hashtable.

Packet processing in my node implemented similar to ng_bridge_rcvdata() 
in ng_bridge.c.
I don't do anything with packet. I don't modifying packet header, I only 
send it to another interface.

My interfaces are working in promiscuous mode with autosrc=0.

But sometimes (after one or two hours working in network) I have an 
error with message:

"rl1: discard frame w/o packet header"

After it, my system halts.

Is anybody knows, where the problem can be? When does this message appears?

(system is FreeBSD 7.1-STABLE)

Thank you.

--
Best regards,
    Alexey Lukashin
Saint-Petersburg, Russia