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Qt 5.12.0 and 5.12.1 crashing intermittently on Mac

  • I had various problems with Qt releases on Mac:

    So I was glad to see that the Qt 5.12.0 release fixed these problems.

    However users have been reporting intermittent crashes of my software built with Qt 5.12.0 on Mac. So I switched to 5.12.1. But this doesn't seem to have helped at all.

    The crash pretty much always happens here:

    0   org.qt-project.QtCore         	0x000000010d138fe8 QMetaObject::cast(QObject*) const + 24
    1   org.qt-project.QtWidgets      	0x000000010c47674b QWidget::isActiveWindow() const + 283
    2   org.qt-project.QtWidgets      	0x000000010c486aad QWidget::initPainter(QPainter*) const + 45
    3   org.qt-project.QtGui          	0x000000010cc508dd QPainter::begin(QPaintDevice*) + 781
    4   org.qt-project.QtGui          	0x000000010cc505c2 QPainter::QPainter(QPaintDevice*) + 242
    5   org.qt-project.QtWidgets      	0x000000010c479937 QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const

    But I am not able to reproduce it here. Which makes it very hard to fix.

    I have also noticed that switching focus from a QComboBox menu and back again can cause the drop-down menu to blank.


    Identical code running on Qt 5.11.0 on Windows is rock solid.

    Any ideas?

    Andy Brice

  • Made no progress on this. Reverting to Qt 5.11.0. :0(

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