Unity8 always crashes on second restart

Unity8 always crashes on second restart.

Using the "restart unity8" command is very handy for applying environment variables and trying things out. The trouble is that it only ever works once. On the second use, Untiy8/Mir fails to start and in some cases the whole phone reboots (arale).

On krillin:

restart unity8
restart unity8
# Now the phone never restarts...
$ tail ~/.cache/upstart/unity8.log
[1440384396.950594] Platform Loader: Selected driver: android (version 0.11.0)
Exiting Mir! Reason: Nested Mir and Host Mir cannot use the same socket file to accept connections!
ERROR: QMirServer - Mir failed to start
terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::logic_error> >'
  what(): Cannot use configuration before apply_settings() call

On mako:

$ system-image-cli -i
current build number: 284
device name: mako
channel: ubuntu-touch/devel-proposed/ubuntu
last update: 2015-08-19 04:19:23
version version: 284
version ubuntu: 20150819
version device: 20150812
version custom: 20150819

$ restart unity8

$ restart unity8

$ tail -f ~/.cache/upstart/unity8.log
[1440385259.474381] mirserver: Starting
[1440385259.474899] mircommon: Loading modules from: /usr/lib/arm-linux-gnueabihf/mir/server-platform
[1440385259.475083] mircommon: Loading module: /usr/lib/arm-linux-gnueabihf/mir/server-platform/graphics-dummy.so
[1440385259.477799] mircommon: Loading module: /usr/lib/arm-linux-gnueabihf/mir/server-platform/input-stub.so
[1440385259.479172] mircommon: Loading module: /usr/lib/arm-linux-gnueabihf/mir/server-platform/graphics-android.so.3
[1440385259.479355] mirplatform: Found graphics driver: dummy
[1440385259.480485] mirplatform: Found graphics driver: android
[1440385259.480851] mirserver: Selected driver: android (version 0.14.0)
Exiting Mir! Reason: Nested Mir and Host Mir cannot use the same socket file to accept connections!
ERROR: QMirServer - Mir failed to start