OOOOOOH!

This could be a threading bug; colord uses g_dbus from glib, which is
threadsafe by means of proxying everything to the main thread, but also
links to libsane, which links to libavahi, which uses libdbus directly.
What's more, avahi spawns a bunch of threads.

libdbus isn't threadsafe unless dbus_threads_init() is called, and
nothing in this stack calls it.

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https://bugs.launchpad.net/bugs/844286

Title:
  colord crashed with SIGSEGV in dbus_message_get_reply_serial()

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