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

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Message-ID: <20130111134058.GB8436@order.stressinduktion.org>
Date:	Fri, 11 Jan 2013 14:40:58 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Roland Dreier <roland@...nel.org>
Cc:	"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 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

I will try to reproduce it at the weekend.

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