I didn't mean to say my Python code was the one crashing with a segfault. Apologies if my comment wasn't clear enough.

I just did a search in my bugzilla account at Red Hat (Fedora distro) but I couldn't find a report for that specific crash. The closest I can find is a report on a crash of notification-daemon (could be related though, as it uses DBUS to advertise a service).

I'm surprised I didn't file a bug report, but there you are.