QtSerialport enters a busy-loop when connected device file disappears

#include <QCoreApplication>
#include <QSerialPort>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QSerialPort sp;
    sp.setPortName("ttyUSB0");
    if (!sp.open(QSerialPort::ReadWrite)) {
        qFatal("Couldn't open ttyUSB0");
        return false;
    }

    return a.exec();
}