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[Michał Sawicz <michal.sawicz@xxxxxxxxxxxxx>]

The crash file is unfortunately uninteresting, doesn't contain the abort
message, we'd need unity8.log from ~/.cache/upstart/, too.

I'll try and reproduce the issue locally.

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https://bugs.launchpad.net/bugs/1347183

Title:
  unity8 unlocker code fails sometimes

Status in “unity8” package in Ubuntu:
  Confirmed

Bug description:
  This is what we see sometimes in our CI runs:
  I: Unlock failed, script output: 'The ubuntuuitoolkit.emulators module is deprecated. Import the autopilot helpers from the top-level ubuntuuitoolkit module.
  INFO:unity8.process_helpers:b'unity8 stop/waiting\n'
  INFO:unity8.process_helpers:unity8 start/running, process 2834

  ERROR:dbus.proxies:Introspect error on :1.59:/com/canonical/Autopilot/Introspection: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/usr/lib/python3/dist-packages/unity8/process_helpers.py", line 63, in unlock_unity
      unity = _get_unity_proxy_object(pid)
    File "/usr/lib/python3/dist-packages/unity8/process_helpers.py", line 184, in _get_unity_proxy_object
      emulator_base=emulators.UnityEmulatorBase,
    File "/usr/lib/python3/dist-packages/autopilot/introspection/_search.py", line 182, in get_proxy_object_for_existing_process
      emulator_base
    File "/usr/lib/python3/dist-packages/autopilot/introspection/_search.py", line 403, in _make_proxy_object
      intro_xml = _get_introspection_xml_from_backend(dbus_address)
    File "/usr/lib/python3/dist-packages/autopilot/introspection/_search.py", line 497, in _get_introspection_xml_from_backend
      return backend.dbus_introspection_iface.Introspect()
    File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 70, in __call__
      return self._proxy_method(*args, **keywords)
    File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 145, in __call__
      **keywords)
    File "/usr/lib/python3/dist-packages/dbus/connection.py", line 651, in call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.

  Is there some way to get the unlocker to retry this, or at least give
  better information about what's going on?

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