From owner-freebsd-bugs@FreeBSD.ORG  Sun Jun 15 13:30:51 2014
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Date: Sun, 15 Jun 2014 15:30:26 +0200
From: =?utf-8?Q?Pawe=C5=82_Tyll?= <ofca@ofca.me>
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Message-ID: <1251795590.20140615153026@ofca.me>
To: Mark van der Meulen <mark@fivenynes.com>
Subject: Re: FreeBSD 9 w/ MPD5 crashes as LNS with 300+ tunnels. Netgraph
 issue?
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Hello Mark,

Sunday, June 15, 2014, 1:09:56 PM, you wrote:
> I=B9m wondering if anyone can help me with this problem or at least help
> point me in the direction of where to start looking? I have FreeBSD 9
> based servers which are crashing every 4-10 days and producing crash dumps
> similar to this one: http://pastebin.com/F82Jc08C
Just for the fun of it,

add this to the template definition:
set iface down-script mpd-down.sh

mpd-down.sh contents being:
#!/bin/sh
/bin/sleep 1

I've  seen  panics  related  to  queuing with dummynet (not dummynet's
fault :P), and this awful hack worked around the real problem.

Not sure if you're suffering from the same race condition tough :)