Attached is a very simple application which just calls QCoreApplication::exec, then creates and destroys a QDBusConnection, then calls QCoreApplication::quit.
On Windows this seems to result in the application getting stuck in some kind of infinite loop. It spams the message QSocketNotifier: socket notifiers cannot be disabled from another thread to stderr.
I'm using Qt 5.6.0 Beta from 2015-12-18. Also provided the stack trace observed when I stop the application in the debugger.