kern/116837: ifconfig tunX destroy: panic

Remko Lodder remko at
Tue Oct 2 10:50:12 PDT 2007

The following reply was made to PR kern/116837; it has been noted by GNATS.

From: "Remko Lodder" <remko at>
To: "Jonathan Pascal" <jkpyvxmzsa at>
Cc: freebsd-gnats-submit at,
 freebsd-bugs at
Subject: Re: kern/116837: ifconfig tunX destroy: panic
Date: Tue, 2 Oct 2007 19:48:58 +0200 (CEST)

 On Tue, October 2, 2007 7:26 pm, Jonathan Pascal wrote:
 > FreeBSD box 7.0-CURRENT FreeBSD 7.0-CURRENT #4: Sat Sep 29 19:41:37 CEST
 > 2007     root at box:/usr/obj/usr/src/sys/CURRENT_STARLIGHT  i386
 > Destroying a tun device while a process is using it via /dev/tunX leads to
 > a kernel panic.
 > # 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
 page and see how you can get more information there. This PR ticket is
 rather difficult to fix without detailed information.
 Thanks & Regards
 Kind regards,
      Remko Lodder               ** remko at
      FreeBSD                    ** remko at
      /* Quis custodiet ipsos custodes */

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