[lxc-users] Preparing for LXC 1.0.8

[Thomas Müller]

I'm happy to help track this down. Like I wrote on the other thread, since
1.1 does not exhibit this bug, it seems like LXC is doing something
differently in the 1.1 branch - this could be a workaround or an actual bug
fix.

Given that the 1.1 branch has another bug related to overlayfs (
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1480411), could it be
that whatever was changed fixes the first issue (failed to whiteout), but
introduces the second issue (operation not permitted)?

Since you are more familiar with the code-base, do you think there might be
a connection between these two that's worth investigating?

Best,
Thomas

On Mon, Aug 31, 2015 at 7:46 PM, Stéphane Graber <stgraber at ubuntu.com>
wrote:

> On Tue, Sep 01, 2015 at 03:01:07AM +1000, overlay fs wrote:
> > The bug,
> >
> > 'Failed to whiteout' error in Trusty with 3.19 kernel
> >
> https://lists.linuxcontainers.org/pipermail/lxc-users/2015-August/009854.html
> > https://bugs.launchpad.net/lxc/+bug/1486073
> > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1490267
> >
> > is present in lxc versions 1.0.7 and 1.0.8, but seems to have been
> resolved
> > in version 1.1.  While this bug is not stricly a regression in lxc-1.0.8,
> > the bug was latent prior to ubuntu-14.04.3 since previous 14.04.x
> releases
> > did not use the 3.19 kernel.
> >
> > As discussed in the lxc-users thread, it is uncertain whether the bug
> > resides in lxc or the kernel.
> >
> > A couple of possible ways to circumvent the bug:
> >
> > (1) Make lxc-1.0.8 depend upon kernel <= 3.17
>
> Userspace packages aren't allowed to depend on specific kernel version
> in Ubuntu. Plus, since only overlay is a problem, that'd be wrong
> anyway.
>
> > (2) Upgrade the version of lxc in ubuntu-14.04 from the 1.0 branch to the
> > 1.1 branch.
>
> Not an option either as major release updates and feature introduction
> isn't allowed in stable Ubuntu releases.
>
> We do have a PPA though for those who do need 1.1.
>
>
> If the whiteout problem is a kernel bug, there's little we can do, if
> it's a lxc bug, then we should fix this and get the fix into the
> stable-1.0 branch.
>
> I did cherry-pick quite a lot of overlay stuff so I'm wondering what
> we'd be missing that 1.1 has...
>
> > -Oleg
>
>
> --
> Stéphane Graber
> Ubuntu developer
> http://www.ubuntu.com
>
> _______________________________________________
> lxc-users mailing list
> lxc-users at lists.linuxcontainers.org
> http://lists.linuxcontainers.org/listinfo/lxc-users
>
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