netdev - Re: Bug#577640: linux-image-2.6.33-2-amd64: Kernel warnings in netns thread

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Date:	Thu, 22 Apr 2010 01:14:38 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Martín Ferrari <martin.ferrari@...il.com>,
	577640@...s.debian.org, netdev <netdev@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...stanetworks.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Mathieu Lacage <mathieu.lacage@...hia.inria.fr>
Subject: Re: Bug#577640: linux-image-2.6.33-2-amd64: Kernel warnings in
 netns  thread

On Wed, 2010-04-21 at 12:36 -0700, Eric W. Biederman wrote:
> Martín Ferrari <martin.ferrari@...il.com> writes:
> 
> > I'm not starting a new thread/bug, as this is probably related...
> >
> > I just discovered that in 2.6.33, if I create a veth inside a
> > namespace and then move one of the halves into the main namespace,
> > when I kill the namespace, I get one of these warnings followed by an
> > oops. This does not happen if the veth is created from the main ns and
> > then moved, nor in 2.6.32. This happens both in Qemu and on real
> > hardware (both amd64)
> >
> > To reproduce:
> >
> > $ sudo ./startns bash
> > # ip l a type veth
> > # ip l s veth0 netns 1
> > # exit
> 
> Nasty weird. I did a quick test here, and I'm not seeing that.
> Does the 2.6.33 experimental kernel have any patches applied?

Yes, but not many beyond the stable updates, and nothing in this area.
You can see the list at:
http://svn.debian.org/wsvn/kernel/dists/trunk/linux-2.6/debian/patches/series/base

Ben.

-- 
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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