[lxc-devel] Linux 4.0.2 and unpriv container problem

[Stéphane Graber]

On Mon, May 11, 2015 at 10:10:02AM -0400, Stéphane Graber wrote:
> On Mon, May 11, 2015 at 06:58:00PM +0900, KATOH Yasufumi wrote:
> > After upgrading kernel to 4.0.2, when an unprivileged container is
> > started, the kernel hangs up. (I use lxc 1.0.7 and today's master
> > branch) 4.0 and 4.0.1 kernel is no problem.
> > 
> > I paste trace log at:
> >   https://gist.github.com/tenforward/01670c4ee77f0bf4d44d
> > 
> > I reverted some commits from 4.0.2, it resolved.
> >   https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.0.y&id=20e62ee6fa3da23a792ca31d4b68069060317260
> >   https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.0.y&id=c076cbf218f3cb83dffe6982587d2b9751318962
> >   https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.0.y&id=84b78514033ff22c443473214ab6d0508394cf7a
> > 
> > Do someone encounter the same problem? Is it a kernel bug?
> > 
> > Thanks,
> > KATOH Yasufumi
> 
> I've had another user report hangs or panic-looking behavior on recent
> 4.0, that's likely the same issue.
> 
> Ccing Eric as he's the author of those kernel changes.

And I just now read a thread on the containers mailing-list covering
this very issue. Looks like the problem was a couple of missing patches
in stable, causing this problem. Eric submitted the missing patches now
so they'll hopefully be included soon, fixing this problem.

-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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