From owner-freebsd-bugs  Mon May 15 14:34:33 1995
Return-Path: bugs-owner
Received: (from majordom@localhost)
          by freefall.cdrom.com (8.6.10/8.6.6) id OAA17153
          for bugs-outgoing; Mon, 15 May 1995 14:34:33 -0700
Received: from jabba.fdn.org (jabba.fdn.org [193.55.4.70])
          by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id OAA17131
          for <freebsd-bugs@freefall.cdrom.com>; Mon, 15 May 1995 14:34:16 -0700
Received: (from uucp@localhost) by jabba.fdn.org (8.6.8/8.6.9) with UUCP id XAA22886; Mon, 15 May 1995 23:33:59 +0200
Received: (pb@localhost) by fasterix.frmug.fr.net (8.6.11/fasterix-941011) id XAA00401; Mon, 15 May 1995 23:31:01 +0200
From: Pierre Beyssac <pb@fasterix.freenix.fr>
Message-Id: <199505152131.XAA00401@fasterix.frmug.fr.net>
Subject: Re: panic in rtfree(): even more info
To: wollman@halloran-eldar.lcs.mit.edu (Garrett Wollman)
Date: Mon, 15 May 1995 23:30:59 +0200 (MET DST)
Cc: pb@fasterix.freenix.fr, freebsd-bugs@freefall.cdrom.com, davidg@Root.COM
In-Reply-To: <9505151848.AA18829@halloran-eldar.lcs.mit.edu> from "Garrett Wollman" at May 15, 95 02:48:05 pm
X-Mailer: ELM [version 2.4 PL23]
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
Content-Length: 1184      
Sender: bugs-owner@FreeBSD.org
Precedence: bulk

Garrett Wollman writes:
> Peter Wemm suggested the following patch from Cornell:
> !                       if ((rt = saved_nrt)->rt_refcnt <= 0)
> !                       if ((rt = saved_nrt))
> 
> Since I have been unable to reproduce the problem, I'd like the people
> experiencing the problem to see if this fixes anything...

It seems to fix the problem, thanks !

Here is how to reproduce the panics (you will not always get a
panic: rtfree, though) :

Boot single, then :

# ifconfig lo0 127.1

Repeat the following until the panic occurs (twice is generally
enough) :

# route add default 127.1
# ping 5.6.7.8
^C
# route delete default

You can vary the ping (-c 1 for example) or do more than one
between the route changes.

I managed to get a panic: rtfree the first time using the following
sequence, but it does not seem to work all the time :

ifconfig lo0 alias 1.2.3.4
route add default 1.2.3.4
ping 5.6.7.8
^C
route delete default
route add default 1.2.3.4
ping 5.6.7.8
-- 
Pierre Beyssac 		pb@fasterix.frmug.fr.net pb@fasterix.fdn.fr
FreeBSD, NetBSD, Linux -- Il y a moins bien, mais c'est plus cher.
You can also get less bang for more bucks. (translation F. Berjon)