Problem with debugging qnetworkaccessmanager

[gandiii]

hi,

I switched my application from Qt 4.8 to Qt 5.0.2
Now I become an illegal instruction when I try to read a website content
with QNetworkAccessManager and I do debugging.
!http://i41.tinypic.com/2i75z6r.png(sigill)!

Thats the line where the debugger crashes:
@0x41774ec0 <+0x0000> vorr q15, q15, q15@

If I run the program it works.

This is my code:
@m_manager = new QNetworkAccessManager(this);
connect(m_manager, SIGNAL(finished(QNetworkReply*)),
this, SLOT(replyFinished(QNetworkReply*)));

void TestClass::replyFinished(QNetworkReply* pReply)
{
QByteArray data=pReply->readAll();
QString str(data);
qDebug() << str;
}
@

I am using QtCreator 3.0.0