Gstreamer plugin try use deleted stream

If I try make something like this, my app crash.

1. I create QMediaPlayer, open QIODevice and playing it.

2. Then I need change QIODevice. I wrote function to reset like this:

void RadioModule::reset(){
player->setMedia(QMediaContent());
ioDevice->close();
delete ioDevice;
ioDevice = 0;
}

3. Then I wrote function to play, something like this:

void RadioModule::play(){
ioDevice = new myQIODevice();
ioDevice->open(QIODevice::Read);
player->setMedia(QMediaContent(QUrl("file:/")),ioDevice);
player->play();
}

4. My app crash in line player->setMedia() in 3 step.

I made debug and saw, that crash in:

void QGstAppSrc::setStream(QIODevice *stream)
{
if (m_stream)
disconnect(m_stream, SIGNAL(readyRead()), this, SLOT(onDataReady()));
...
}

Because m_stream contains pointer to old stream, that I delete in 2 step.

And I have question. How right reset stream?

As I understand player->setMedia(QMediaContent()) in 2 step not clear m_stream. But, if it try clear m_stream we also will have error like this, because setMedia() is slot and it may call after delete ioDevice. May be we need add QMediaPlayer::resetStream() function or other solution.
I see workaround. If I delete object, when get signal QMediaPlayer::mediaChanged() or QMediaPlayer::mediaStatusChanged() but as for me this is bad way.

PS: This bug difficult to reproduce. Now I try write good example.