netdev - Re: unregister_netdevice warnings when deleting netns

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Message-ID: <alpine.LFD.2.11.1509282202270.7276@ja.home.ssi.bg>
Date:	Mon, 28 Sep 2015 22:12:35 +0300 (EEST)
From:	Julian Anastasov <ja@....bg>
To:	Anand Gurram <anandarao.gurram@...il.com>
cc:	NETDEV <netdev@...r.kernel.org>
Subject: Re: unregister_netdevice warnings when deleting netns


	Hello,

On Mon, 28 Sep 2015, Anand Gurram wrote:

> I am currently using kernel version 3.16.7 on a linux switch.
> While creating and destroying network namespaces I am observing below logs
> on the console
> "unregister_netdevice: waiting for lo to become free. Usage count = 1"
> 
> Can you please suggest and provide instructions on how to debug this issue.
> If any fix already available can you please point me to the link.

	There are two commits from Linux 4.2 that may help:

commit e9e4dd3267d0 ("net: do not process device backlog during unregistration")
commit 2c17d27c36dc ("net: call rcu_read_lock early in process_backlog")

	For now I see them only in 3.2.71+ and 3.12.48+.
I think, they will appear in other stable versions too...

Regards

--
Julian Anastasov <ja@....bg>
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