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Date: Tue, 2 Oct 2007 19:48:58 +0200 (CEST)
From: "Remko Lodder" <remko@elvandar.org>
To: "Jonathan Pascal" <jkpyvxmzsa@mailinator.com>
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Cc: freebsd-bugs@FreeBSD.org, freebsd-gnats-submit@freebsd.org
Subject: Re: kern/116837: ifconfig tunX destroy: panic
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On Tue, October 2, 2007 7:26 pm, Jonathan Pascal wrote:
>>Organization:
>>Environment:
> FreeBSD box 7.0-CURRENT FreeBSD 7.0-CURRENT #4: Sat Sep 29 19:41:37 CEST
> 2007     root@box:/usr/obj/usr/src/sys/CURRENT_STARLIGHT  i386
>>Description:
> Destroying a tun device while a process is using it via /dev/tunX leads to
> a kernel panic.
>>How-To-Repeat:
> # cat < /dev/tun0 > /dev/tun0 &
> # ifconfig tun0 destroy
>
> panic: tununits is out of sync - unit 0

So are you running with the debugging symbols etc? Do you get a core dump?
if so please go to the
http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug.html
page and see how you can get more information there. This PR ticket is
rather difficult to fix without detailed information.

Thanks & Regards
remko

-- 
Kind regards,

     Remko Lodder               ** remko@elvandar.org
     FreeBSD                    ** remko@FreeBSD.org

     /* Quis custodiet ipsos custodes */