[lxc-users] 'Failed to whiteout' error in Trusty with 3.19 kernel

[Thomas Müller]

Hi Serge,

thanks for your response.

If this is a kernel issue, what puzzles me a bit is that this error goes
away when switching from the lts-lxc version to the lxc-stable ppa. While
the ppa version seems to fix this bug, it still has the issue that oleg
mentioned above (
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1480411).

Should I still open a kernel issue?

Best,
Thomas

On Sat, Aug 29, 2015 at 6:19 PM, Serge Hallyn <serge.hallyn at ubuntu.com>
wrote:

> Quoting overlay fs (overlayfs at gmail.com):
> > > On Fri Aug 14 Thomas Müller wrote:
> > > Hi everyone,
> > >
> > > I'm running Ubuntu trusty and recently upgraded to the new kernel
> (3.19).
> > > When creating a snapshotted clone of a regular LXC container using
> > > overlayfs, I'm now seeing the kernel error 'failed to whiteout'.
> > >
> > > Has anyone experienced a similar problem, is this a known issue
> already?
> > >
> > > Below some debug information:
> > >
> > > - Kernel error: http://pastebin.com/iajXHbHZ
> > > - Kernel version: 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24
> > > 21:16:20 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
> > > - Executed LXC command: lxc-clone -s -B overlayfs orig test (both
> > > unprivileged containers)
> > > - LXC version: 1.0.7
> > >
> > > Any help/pointers would be appreciated.
> > >
> > > Best
> > > Thomas
> >
> > I can reproduce the 'failed to whiteout' error message, though not the
> > kernel oops, in kvm.
>
> Hi,
>
> this isn't an lxc error, but a kernel bug.  You can't reproduce it with
> a privileged container, right?  So I think it's a bug in the patches
> supporting unprivileged use of overlayfs in the trusty sources for
> linux-lts-vivid.  Can you open a bug or bring this up in #ubuntu-kernel?
> (The error message shows up in ovl_do_whiteout_v1()).
>
> -serge
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