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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1409425

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: utopic

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https://bugs.launchpad.net/bugs/1409425

Title:
  lxc-start-ephemeral stops working with kernel 3.18 - overlayfs change?

Status in linux package in Ubuntu:
  Incomplete
Status in lxc package in Ubuntu:
  New

Bug description:
  With the previous vivid kernel 3.16.0-28-generic,"lxc-start-ephemeral
  -o containername" works fine. With the current 3.18.0-8-generic  it
  fails with "the container failed to start". This is reproducible in a
  clean cloud VM:

  $ sudo apt install lxc
  $ sudo lxc-create -t busybox -n c1

  # works fine under all kernels:
  $ sudo lxc-start -n c1 -F

  $ sudo lxc-start-ephemeral -o c1
  The container 'c1-0twqb553' failed to start.

  It happens with both the above busybox as well as with a full ubuntu
  OS container, so I don't think that's relevant.

  Unfortunately lxc-start-ephemeral has no --logfile or --logpriority or
  similar debugging tools, and even with -k it doesn't keep a container
  or logs around for inspection.

  dmesg might have something worth noting, look at the third line:

  [  465.694541] device vethQLD78J entered promiscuous mode
  [  465.694611] IPv6: ADDRCONF(NETDEV_UP): vethQLD78J: link is not ready
  [  465.726758] overlayfs: missing upperdir or lowerdir or workdir
  [  465.744501] eth0: renamed from vethWRSY7B
  [  465.745673] IPv6: ADDRCONF(NETDEV_CHANGE): vethQLD78J: link becomes ready
  [  465.745693] lxcbr0: port 1(vethQLD78J) entered forwarding state
  [  465.745697] lxcbr0: port 1(vethQLD78J) entered forwarding state
  [  465.746618] lxcbr0: port 1(vethQLD78J) entered disabled state
  [  465.747134] device vethQLD78J left promiscuous mode
  [  465.747140] lxcbr0: port 1(vethQLD78J) entered disabled state

  So maybe overlayfs changed its semantics somehow in the new kernel?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: lxc 1.1.0~alpha3-0ubuntu1
  ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-28-generic x86_64
  ApportVersion: 2.15.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Jan 11 12:45:06 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-11-20 (52 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141119)
  SourcePackage: lxc
  UpgradeStatus: No upgrade log present (probably fresh install)
  defaults.conf:
   lxc.network.type = veth
   lxc.network.link = lxcbr0
   lxc.network.flags = up
   lxc.network.hwaddr = 00:16:3e:xx:xx:xx
  lxc.conf: lxc.lxcpath = /srv/lxc
  modified.conffile..etc.apparmor.d.abstractions.lxc.start.container: [modified]
  mtime.conffile..etc.apparmor.d.abstractions.lxc.start.container: 2015-01-08T13:09:02.545927

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