Buffer underflow

[Evil_Genius]

After each play the sound track using the QAudioOutput I get a message in Application Output: "Got a buffer underflow!". What could be the reason?
Here is the code:

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QFile file;
    file.setFileName("/path/to/file/1.wav");
    file.open(QIODevice::ReadOnly);
    QAudioFormat outputFormat;
    outputFormat.setSampleRate(44100);
    outputFormat.setChannelCount(1);
    outputFormat.setSampleSize(16);
    outputFormat.setCodec("audio/pcm");
    outputFormat.setByteOrder(QAudioFormat::LittleEndian);
    outputFormat.setSampleType(QAudioFormat::SignedInt);
    QAudioOutput* player = new QAudioOutput(outputFormat);
    player->start(&file);
    QEventLoop loop;
    QObject::connect(player, SIGNAL(stateChanged(QAudio::State)), &loop, SLOT(quit()));
    do{
        loop.exec();
    }while(player->state() == QAudio::ActiveState);
    file.close();
    delete player;
    return a.exec();
}

In more complicated project occurs SegFault at instruction return a.exec();, when I play sound using the QAudioOutput.
My OS is Debian Linux. Kernel 3.16.0-4-amd64. Compiler - GCC v4.9.2. Qt version - 5.5.0