Livelock with QTimer

There is a Livelock situation with QTimer that I can't prevent without modifying Qt.

The problem occurs when there is a qt_fast_timer_proc call (which is typically called from a TimeCritical thread) and there are already a lot of items in the event queue. In my (full Debug) situation I had 100k events in the event queue.

QCoreApplication::compressEvent in this case took longer than the event timeout, which immediately triggers another timer event, etc etc etc. Freezing the timer thread from the debugger allowed the main thread to clean up the event queue and operation to continue normally.

It would be nice if something was added that will allow these fast timers to bypass compression or even that qt_fast_timer_proc itself guards against this situation somehow.

For me the situation occurs when using QNetworkAccessManager to download a (big) file which I then immediately open in my application.