netdev - Re: NET_NS: unregister_netdevice: waiting for lo to become free (after using openvpn)

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Message-ID: <4C5AED6A.8040602@candelatech.com>
Date:	Thu, 05 Aug 2010 09:57:14 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Michael Leun <lkml20100708@...ton.leun.net>,
	Greg KH <greg@...ah.com>, netdev@...r.kernel.org,
	davem@...emloft.net, linux-kernel@...r.kernel.org,
	Alexey Dobriyan <adobriyan@...il.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: NET_NS: unregister_netdevice: waiting for lo to become free (after
 using openvpn)

On 08/05/2010 02:51 AM, Eric W. Biederman wrote:
> Michael Leun<lkml20100708@...ton.leun.net>  writes:

>> Unfortunately looks like indefinitely. Never watched longer so far
>> (rebooted soon), but I'm seeing this message now repeated every 10 secs
>> for ~10 minutes on a idle system.
>
> Ugh.  A real bug then.  These can be a pain to track down and fix. I
> think the last one of these I tracked down took a couple of weeks.  I
> will start digging in when I get back from vacation.

I once spent a similar amount of time putting in debug variants that
printed info for each time a netdev was acquired and released.

Maybe a similar logic could be put into the official kernel (and
disabled by default)?

That should save effort in the long run, I'd think.

Thanks,
Ben


-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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