Crash in QSet<QByteArray>

If a QSet<QByteArray> has been defined as a local variable, access to it produces a crash in release mode:

QSet<QByteArray> componentIds;
componentIds << "test" << "blabla";
for (auto it : componentIds)
qDebug() << it; // here crashes deep in qHash

It works fine in debug although, so there is possible that release dlls are broken.