netdev - Re: [PATCH/RFC] ipv6: fib: Drop cached routes with dead neighbours on fib GC

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Date:	Fri, 11 Jan 2013 15:01:19 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Roland Dreier <roland@...nel.org>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Roland Dreier <roland@...estorage.com>
Subject: Re: [PATCH/RFC] ipv6: fib: Drop cached routes with dead neighbours on fib GC

On Fri, Jan 11, 2013 at 02:40:58PM +0100, Hannes Frederic Sowa wrote:
> On Wed, Jan 09, 2013 at 09:44:19AM -0800, Roland Dreier wrote:
> > From: Roland Dreier <roland@...estorage.com>
> > 
> > This patch is as much bug report as it is a proposal to merge this
> > specific patch.  The problem is definitely real; we hit it in a
> > situation where we have two systems connected back-to-back with two
> > bonded links between them, one system reboots, and the other system
> > gets NETDEV_CHANGEADDR.  This patch definitely fixes that case for us,
> > but I'm not sure it's the right place to fix this, or if it covers all
> > the cases where this could happen.  Anyway...
> 
> Great analysis, thanks!
> 
> There is bug report which indicates a fix to this problem could
> also solve some other corner cases regarding neighbour discovery:
> https://bugzilla.kernel.org/show_bug.cgi?id=42991

The report I meant was actually not referred in this bug report:
http://article.gmane.org/gmane.linux.network/224832

ENETDOWN was also observed via bridges.

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