(In reply to comment #27)
> OK, that works. I'm getting 
> 
> g_dbus_connection_real_closed: Remote peer vanished with error: Underlying
> GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
> 
> after the tmp dir is removed, but I assume it's a harmless artifact at this
> point.

Probably there was some process running which relied on D-Bus. Are you sure
it's related to removing the XDG_RUNTIME_DIR and not jsut shutting down the
D-Bus daemon?

As you said, it should be harmless.