netdev - Re: [PATCH] Fix race condition about network device name allocation

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Date:	Thu, 14 Jun 2007 09:07:38 +0300
From:	Dan Aloni <da-x@...atomic.org>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Fix race condition about network device name allocation

On Wed, Jun 13, 2007 at 09:36:31AM -0700, Stephen Hemminger wrote:
> On Wed, 13 Jun 2007 12:45:21 +0300
> Dan Aloni <da-x@...atomic.org> wrote:
> 
> > On Mon, May 14, 2007 at 08:58:40AM -0700, Stephen Hemminger wrote:
> > > Kenji Kaneshige found this race between device removal and
> > > registration.  On unregister it is possible for the old device to
> > > exist, because sysfs file is still open.  A new device with 'eth%d'
> > > will select the same name, but sysfs kobject register will fial.
> > > 
> > > The following changes the shutdown order slightly. It hold a removes the sysfs
> > > entries earlier (on unregister_netdevice), but holds a kobject reference.
> > > Then when todo runs the actual last put free happens.
> > > 
> > > Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>
> > 
> > That patch breaks the bonding driver. After reverting it I avoid this crash:
> > 
>[..]
> > 
> 
> I assume this happens when bonded slave device is removed?

Yes, it's just a simple removal via sysfs.

> Which kernel version?

2.6.21.5

-- 
Dan Aloni
XIV LTD, http://www.xivstorage.com
da-x (at) monatomic.org, dan (at) xiv.co.il
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