netdev - Re: Lockup with tun/tap/bridge interface deregistration.

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Date:	Thu, 11 Dec 2008 21:49:54 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Mathieu SEGAUD <mathieu.segaud@...ala.cx>, netdev@...r.kernel.org,
	kernel@...too.org
Subject: Re: Lockup with tun/tap/bridge interface deregistration.

On Thu, Dec 11, 2008 at 10:43:03AM +0000, Jarek Poplawski wrote:
> On Thu, Dec 11, 2008 at 10:24:21AM +0000, Jarek Poplawski wrote:
> ...
> > Could you try e.g. 2.6.27.7 or something with this patch?:
> > 
> > http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.27.y.git;a=commit;h=58ec3b4db9eb5a28e3aec5f407a54e28f7039c19
> 
> Oops! 2.6.27.4 has this too...

Right, this fixes a dead-lock that causes the RTNL to be held which
doesn't seem to be the case here.  It sounds like the problem in
this thread is simply due to a non-zero ref count on the netdev
itself.

Mathieu, you should get a message like this

	unregister_netdevice: waiting for %s to become free. Usage count = %d

What does your count say?

Thanks,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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