netdev - RE: PROBLEM: [3.4] neigh_destroy() crashes on unplug netdev.

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Date:	Thu, 15 Jan 2015 07:50:41 +0000
From:	Nakashima Akihiro <Nakashima.Akihiro@....epson.co.jp>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Ueda Motoki <Ueda.Motoki@....epson.co.jp>,
	"Otsu Takahiro" <Otsu.Takahiro@....epson.co.jp>,
	Tomono Mitsunori <Tomono.Mitsunori@....epson.co.jp>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: PROBLEM: [3.4] neigh_destroy() crashes on unplug netdev.

Dear Eric:

3.6 or later kernels (including recent mainline) do not have this problem.
3.4.105 is based on an old kernel, but it is a latest kernel of 3.4 LTS branch.
I think it is better to backport 20 patches to LTS branch.
But if you do not have such support policy, I will apply these patches to my 3.4 kernel only.

Thanks

-----Original Message-----
From: Eric Dumazet [mailto:eric.dumazet@...il.com] 
Sent: Thursday, January 15, 2015 4:03 PM
To: Nakashima Akihiro
Cc: davem@...emloft.net; netdev@...r.kernel.org; Ueda Motoki; Otsu Takahiro; Tomono Mitsunori; linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: [3.4] neigh_destroy() crashes on unplug netdev.

On Thu, 2015-01-15 at 05:57 +0000, Nakashima Akihiro wrote:
> Dear David and networking developers:
> 
> I got kernel panic on 3.4.105 kernel.
> Please see a report below.

Please try a recent kernel.

We are not going to debug such an old one, given there are chances we already fixed the problem ages ago.

Thanks