QTimeZone::availableTimeZoneIds() crashes on Mac OSX 10.9.2

Whenever I use QNetworkAccessManager (regardless of the query, even an empty url as in the code attached) and make a call to the QTimeZone(QByteArray) constructor, the application crashes somewhere in the internals of QCocoaEventDispatcher::processEvents() shortly after the call to QTimeZone is made.

Only the constructors involving the timeZoneId (QByteArray) produce the crash. The other constructors do not appear to pose a problem.

The crash is produced only with QApplication and QGUIApplication, not with QCoreApplication.

Attached you can find the minimum code that consistently reproduces the error on my computer (did not have the occasion to test on other configurations). I also attached the debug stack at the moment of the crash (stack.txt).

Needless to say that if this is really a bug, it seriously poses problems for mobile development since quite a few applications need access to the network and to the current timezone and there doesn't seem to be a workaround. At least I didn't find any yet.