QThread/QObject and QTimer

I'm using QTimer in QThread( or QObject ) class :

Code:

---

class InfoThread: public QThreed
{
Q_OBJECT
...
 void run();
signals:
 void newInfoAvalible(  /* some data */  );
private slots:
 void update();
..
private:
 QTimer *p_timer;
};
 
InfoThread::Infothread( QObject *parent ) : QThread( parent )
{
 p_timer = new QTimer( this );
 connect(  p_timer, SIGNAL( timeout() ), this, SLOT( update() ) );
}
 
void InfoThread::run()
{
 p_timer->start( 1000 );
 exec(); // event loop for QTimer
}
 
void InfoThread::update()
{ 
 ...
 emit newInfoAvalible( /* some data */ );
}

---

For me code is good, but signal newInfoAvalible( /* some data */ ) causes apps to crash. Wher's the problem?

Is newInfoAvalible() connected to a slot in another QThread?
If so, does the /*some data*/ contain pointers to something which are invalid after you leave this function? If so, this is expected, as signals between threads use "queued connections".

The QTimer object must be created in InfoThread::run() without a parent (preferably on the stack since QThread::exec() blocks) and the connection must be forced as direct

Code:

---

connect(  &timer, SIGNAL( timeout() ), this, SLOT( update() ), Qt::DirectConnection );

---

because QThread itself lives in different thread than what's being executed in QThread::run().