netdev - Re: [PATCH 1/1] net: race condition when removing virtual net

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Message-ID: <CA+HUmGhmx_nAnvV4wyZ0Un-E9MZwbHRV7c=eCBBoJ+im+z1oew@mail.gmail.com>
Date:	Mon, 16 Sep 2013 22:12:35 -0700
From:	Francesco Ruggeri <fruggeri@...stanetworks.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jiri Pirko <jiri@...nulli.us>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Cong Wang <amwang@...hat.com>, netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] net: race condition when removing virtual net_device

On Mon, Sep 16, 2013 at 5:25 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:

>
> If you could verify that my patch to dev_close solves the ordering
> issues you were seeing I would appreciate that.
>

I have not run extensive tests, but your patch fixes the reordering
issue I was seeing in dev_close_many. When I destroyed a namespace
with only v0 and lo the order was preserved from
unregister_netdevice_many to netdev_run_todo.

Francesco

====== lo down, v0 down
unregister_netdevice_queue: v0 (ns ffff880136bc8000)
unregister_netdevice_queue: lo (ns ffff880136bc8000)
unregister_netdevice_many: v0 (ns ffff880136bc8000) lo (ns ffff880136bc8000)
netdev_run_todo: v0 (ns ffff880136bc8000) lo (ns ffff880136bc8000)

====== lo up, v0 down
unregister_netdevice_queue: v0 (ns ffff880037ac8000)
unregister_netdevice_queue: lo (ns ffff880037ac8000)
unregister_netdevice_many: v0 (ns ffff880037ac8000) lo (ns ffff880037ac8000)
netdev_run_todo: v0 (ns ffff880037ac8000) lo (ns ffff880037ac8000)


====== lo down, v0 up
unregister_netdevice_queue: v0 (ns ffff880136bc8000)
unregister_netdevice_queue: lo (ns ffff880136bc8000)
unregister_netdevice_many: v0 (ns ffff880136bc8000) lo (ns ffff880136bc8000)
netdev_run_todo: v0 (ns ffff880136bc8000) lo (ns ffff880136bc8000)


====== lo up, v0 up
unregister_netdevice_queue: v0 (ns ffff880037ac8000)
unregister_netdevice_queue: lo (ns ffff880037ac8000)
unregister_netdevice_many: v0 (ns ffff880037ac8000) lo (ns ffff880037ac8000)
netdev_run_todo: v0 (ns ffff880037ac8000) lo (ns ffff880037ac8000)
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