Imagine an application which exposes multiple objects to DBus. Those objects all derive from common a base class "DBusService", which does:

       QDBusConnection connection = QDBusConnection::sessionBus();
       connection.registerObject("/" + mObjectIdentity, this);
       connection.registerService(mServiceName);

If those objects are created in multiple threads, it should still work fine (right?), but these concurrent calls to QDBusConnection::registerService create a data race on the lastError variable in QDBusConnectionPrivate.

tst_qdbusconnection.cpp.diff

dbusconnection-tsan.log