lxc-test-unpriv failed with Trusty Azure 4.15

[Po-Hsu Lin]

The overlayfs is complaining about "No such device" here.

  FAIL: lxc-tests: /usr/bin/lxc-test-unpriv
  ---
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  /usr/sbin/deluser: The user `lxcunpriv' does not exist.
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  Using image from local cache
  Unpacking the rootfs

  ---
  You just created an Ubuntu trusty amd64 (20181101_07:42) container.

  To enable SSH, run: apt install openssh-server
  No default root or user password are set by LXC.
  Name: c1
  State: RUNNING
  PID: 14280
  CPU use: 0.32 seconds
  BlkIO use: 0 bytes
  Memory use: 3.68 MiB
  KMem use: 1.77 MiB
  Link: veth0TEM5A
   TX bytes: 0 bytes
   RX bytes: 0 bytes
   Total bytes: 0 bytes
  lxc_container: bdev.c: overlayfs_mount: 2320 No such device - overlayfs: error mounting /home/lxcunpriv/.local/share/lxc/c1/rootfs onto /usr/lib/x86_64-linux-gnu/lxc options upperdir=/home/lxcunpriv/.local/share/lxc/c2/delta0,lowerdir=/home/lxcunpriv/.local/share/lxc/c1/rootfs,workdir=/home/lxcunpriv/.local/share/lxc/c2/olwork
  clone failed
  c2 is not running
  c1 is not running
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  Removing user `lxcunpriv' ...
  Warning: group `lxcunpriv' has no more members.
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  Done.
  FAIL

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-4.15.0-1032-azure 4.15.0-1032.33~14.04.2
ProcVersionSignature: User Name 4.15.0-1032.33~14.04.2-username 4.15.18
Uname: Linux 4.15.0-1032-azure x86_64
ApportVersion: 2.14.1-0ubuntu3.29
Architecture: amd64
Date: Fri Nov 16 09:27:43 2018
SourcePackage: linux-signed-azure
UpgradeStatus: No upgrade log present (probably fresh install)

[Po-Hsu Lin (cypressyew)]

Can be reproduced with 4.15.0-1030-azure #31~14.04.1-Ubuntu as well

[Po-Hsu Lin (cypressyew)]

The Failure is different this cycle:
 FAIL: lxc-tests: /usr/bin/lxc-test-unpriv
 ---
 sent invalidate(passwd) request, exiting
 sent invalidate(group) request, exiting
 /usr/sbin/deluser: The user `lxcunpriv' does not exist.
 sent invalidate(passwd) request, exiting
 sent invalidate(group) request, exiting
 sent invalidate(passwd) request, exiting
 sent invalidate(group) request, exiting
 sent invalidate(passwd) request, exiting
 sent invalidate(group) request, exiting
 sent invalidate(passwd) request, exiting
 sent invalidate(group) request, exiting
 Failed to open connection to "unix:path=/sys/fs/cgroup/cgmanager/sock" message bus: Failed to connect to socket /sys/fs/cgroup/cgmanager/sock: Connection refused
 c2 is not running
 c1 is not running
 ---