> 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. It seems that the version of lxc in ubuntu-14.04 has an unstated dependency upon kernel version <= 3.17 . This will likely give rise to problems, because ubuntu-14.04.3 ships with the 3.19 kernel. Perhaps the lxc package maintainer would add the kernel-dependency to ubuntu-14.04's lxc package? The error message goes away when I upgrade to the daily build of lxc, https://launchpad.net/~ubuntu-lxc/+archive/ubuntu/daily <https://launchpad.net/%7Eubuntu-lxc/+archive/ubuntu/daily> I haven't tested the more stable lxc versions at https://launchpad.net/~ubuntu-lxc . After upgrading lxc you may need to reboot and perhaps also to destroy-and-recreate the overlayfs-backed container. On a related matter, I would be interested to hear whether you are affected by the overlayfs bug at, https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1480411 This bug affects unprivileged containers which use overlayfs in conjunction with kernel 3.18+. A script to test whether you are affected is attached to the bug report and is also available at, http://paste.ubuntu.com/11974137/ If you are affected, it would be helpful if you would add a comment to the bug report, since the bug status will then be changed to 'confirmed'. -Oleg
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