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Date:      Wed, 6 Dec 2006 14:37:34 +0100
From:      Max Laier <max@love2party.net>
To:        freebsd-pf@freebsd.org, Volker <volker@vwsoft.com>
Subject:   Re: kern/106400: fatal trap 12 at restart of PF with ALTQ if ng0 device has detached
Message-ID:  <200612061437.40562.max@love2party.net>
In-Reply-To: <200612061320.kB6DK5iO004938@freefall.freebsd.org>
References:  <200612061320.kB6DK5iO004938@freefall.freebsd.org>

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On Wednesday 06 December 2006 14:20, Volker wrote:
> The following reply was made to PR kern/106400; it has been noted by
> GNATS.
>
> From: Volker <volker@vwsoft.com>
> To: bug-followup@FreeBSD.org,  bst2006@dva.dyndns.org
> Cc:
> Subject: Re: kern/106400: fatal trap 12 at restart of PF with ALTQ if
> ng0 device has detached
> Date: Wed, 06 Dec 2006 14:16:42 +0100
>
>  First I would suggest to use ALTQ w/ mpd not on ng0 but on the real
>  physical interface (for example fxp0, xl0) which is being used by
>  netgraph/mpd.
>
>  On the other side I also do have trouble using ALTQ with mpd but I'm
>  using mpd for a 3G connection (based on a tty device, not a NIC).
>
>  Avoiding ALTQ rules in pf.conf for the ng0 interface (not using ALTQ
>  on ng0) doesn't produce a fatal trap 12. So disabling ALTQ in your
>  kernel is not the only workaround. You may still use ALTQ on your
>  internal NIC without a trap.
>
>  Unlike your experience, I always do experience a kernel trap when
>  reloading pf rules w/ ALTQ on ng0 (whether or not pf rules are
>  reloaded by a script or manually).
>
>  This also occours while the ng0 interface is still there and from my
>  experience it's not related to a reload of mpd.

Can you provide a trace for this panic?  I have a good understanding of=20
the issue in the PR, but your problem seems to be quite different if the=20
ng0 device really doesn't go away meanwhile.  More details would be=20
required.

=2D-=20
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