RUN: /usr/share/launchpad-buildd/slavebin/slave-prep 
Forking launchpad-buildd slave process...
Kernel version: Linux bos01-arm64-049 4.4.0-101-generic #124-Ubuntu SMP Fri Nov 10 18:30:44 UTC 2017 aarch64
Buildd toolchain package versions: launchpad-buildd_157 python-lpbuildd_157 sbuild_0.67.0-2ubuntu7.1 bzr-builder_0.7.3+bzr174~ppa13~ubuntu14.10.1 bzr_2.7.0-2ubuntu3.1 git-build-recipe_0.3.4~git201611291343.dcee459~ubuntu16.04.1 git_1:2.7.4-0ubuntu1.3 dpkg-dev_1.18.4ubuntu1.3 python-debian_0.1.27ubuntu2.
Syncing the system clock with the buildd NTP service...
 5 Dec 11:36:31 ntpdate[1817]: adjust time server 10.211.37.1 offset 0.001211 sec
RUN: /usr/share/launchpad-buildd/slavebin/in-target unpack-chroot --backend=lxd --series=xenial --arch=armhf SNAPBUILD-117247 /home/buildd/filecache-default/b3be73ab5ae7c15f478bfb6b61c08aecabde888d
Creating target for build SNAPBUILD-117247
RUN: /usr/share/launchpad-buildd/slavebin/in-target mount-chroot --backend=lxd --series=xenial --arch=armhf SNAPBUILD-117247
Starting target for build SNAPBUILD-117247
/usr/lib/python2.7/dist-packages/pylxd/model.py:113: UserWarning: Attempted to set unknown attribute "used_by" on instance of "Profile"
  key, self.__class__.__name__
/usr/lib/python2.7/dist-packages/pylxd/model.py:113: UserWarning: Attempted to set unknown attribute "description" on instance of "Container"
  key, self.__class__.__name__
Traceback (most recent call last):
  File "/usr/share/launchpad-buildd/slavebin/in-target", line 27, in <module>
    sys.exit(main())
  File "/usr/share/launchpad-buildd/slavebin/in-target", line 23, in main
    return args.operation.run()
  File "/usr/lib/python2.7/dist-packages/lpbuildd/target/lifecycle.py", line 40, in run
    self.backend.start()
  File "/usr/lib/python2.7/dist-packages/lpbuildd/target/lxd.py", line 380, in start
    container.start(wait=True)
  File "/usr/lib/python2.7/dist-packages/pylxd/container.py", line 163, in start
    wait=wait)
  File "/usr/lib/python2.7/dist-packages/pylxd/container.py", line 151, in _set_state
    self.sync()
  File "/usr/lib/python2.7/dist-packages/pylxd/model.py", line 154, in sync
    setattr(self, key, val)
  File "/usr/lib/python2.7/dist-packages/pylxd/model.py", line 135, in __setattr__
    return super(Model, self).__setattr__(name, value)
AttributeError: 'Container' object has no attribute 'description'
RUN: /usr/share/launchpad-buildd/slavebin/in-target umount-chroot --backend=lxd --series=xenial --arch=armhf SNAPBUILD-117247
Stopping target for build SNAPBUILD-117247
/usr/lib/python2.7/dist-packages/pylxd/model.py:113: UserWarning: Attempted to set unknown attribute "description" on instance of "Container"
  key, self.__class__.__name__
Traceback (most recent call last):
  File "/usr/share/launchpad-buildd/slavebin/in-target", line 27, in <module>
    sys.exit(main())
  File "/usr/share/launchpad-buildd/slavebin/in-target", line 23, in main
    return args.operation.run()
  File "/usr/lib/python2.7/dist-packages/lpbuildd/target/lifecycle.py", line 74, in run
    self.backend.stop()
  File "/usr/lib/python2.7/dist-packages/lpbuildd/target/lxd.py", line 519, in stop
    container.stop(wait=True)
  File "/usr/lib/python2.7/dist-packages/pylxd/container.py", line 170, in stop
    wait=wait)
  File "/usr/lib/python2.7/dist-packages/pylxd/container.py", line 151, in _set_state
    self.sync()
  File "/usr/lib/python2.7/dist-packages/pylxd/model.py", line 154, in sync
    setattr(self, key, val)
  File "/usr/lib/python2.7/dist-packages/pylxd/model.py", line 135, in __setattr__
    return super(Model, self).__setattr__(name, value)
AttributeError: 'Container' object has no attribute 'description'
RUN: /usr/share/launchpad-buildd/slavebin/in-target remove-build --backend=lxd --series=xenial --arch=armhf SNAPBUILD-117247