QImage crash when saving image(Qt5.0.2) on mac osx 10.8.3

Sometimes this would crash(race condition?) if you don’t lock the save function
Is this a bug? Or a behavior of save?In Qt4 I haven’t found this kind of problem yet

These are part of the error messages after the .app crash

http://www.flickr.com/photos/92283971@N04/8678167798/in/photostream

ps : there are the other small bug, the SLOT aboutQt will always show you you are using Qt5.0.1 but not Qt5.0.2

#include <functional>

#include <QApplication>
#include <QtConcurrent/QtConcurrentMap>
#include <QImage>
#include <QLabel>

//QMutex mutex;

int process_image_impl(QString const &name)
{
QImage image(name);

if(!image.isNull())

{ //QMutexLocker(&QMutex); you have to lock it to prevent undefined behavior image.save("save/" + name); }

return 0;
}

int main(int argc, char *argv[])
{
QApplication a(argc, argv);

namespace ph = std::placeholders;

QStringList image_name;
for(size_t i = 0; i != 10; ++i)

{ image_name <<("onebit_" + QString::number(30 + i) + ".png"); }

QtConcurrent::blockingMapped(image_name, std::bind<int>(process_image_impl, ph::_1));

QLabel w;
w.show();

return a.exec();
}

The images are compress in the zip file