Created attachment 211277 [details] Sample application to reproduce the crash The attached sample application uses QtWebKit's QWebPluginFactory to add a simple OpenGL based plugin(QGLWidget based). On resizing the application , it crashes in QPainter::save() with a warning message "QPaintDevice: Cannot destroy paint device that is being painted" This crash happens only on windows and I am able to resize the app without issues on mac. Tested with Qt 5.1.1, msvc c++ compiler(visual studio 2012), windows 7 Also, it appears that this bug has been introduced after QT4.8.4 as the crash does not occur when tested with Qt4.8.4 The crash log I see appears to be similar to the issue reported in https://bugs.webkit.org/show_bug.cgi?id=109785 I have added my comments to this bug as well. Attached is a simple sample application that demonstrates the crash. Crash log: 0 QPainter::save qpainter.cpp 1581 0xbcd94a 1 WebCore::GraphicsContext::savePlatformState GraphicsContextQt.cpp 349 0x29b4260 2 WebCore::GraphicsContext::save GraphicsContext.cpp 103 0x29aae32 3 QWebFrameAdapter::renderRelativeCoords QWebFrameAdapter.cpp 520 0x25c8c8e 4 QWebFrame::render qwebframe.cpp 643 0xf94ac06 5 QWebFrame::render qwebframe.cpp 654 0xf94abc4 6 QWebView::paintEvent qwebview.cpp 831 0xf95a868 7 QWidget::event qwidget.cpp 8043 0x648c6d8f 8 QWebView::event qwebview.cpp 730 0xf95a465 9 QApplicationPrivate::notify_helper qapplication.cpp 3457 0x6488131e 10 QApplication::notify qapplication.cpp 3422 0x6487f3ac 11 QCoreApplication::notifyInternal qcoreapplication.cpp 867 0x66c7fdc4 12 QCoreApplication::sendSpontaneousEvent qcoreapplication.h 235 0x66d91938 13 QWidgetPrivate::drawWidget qwidget.cpp 5132 0x648cc61e 14 QWidgetPrivate::paintSiblingsRecursive qwidget.cpp 5327 0x648ccc8a 15 QWidgetPrivate::drawWidget qwidget.cpp 5185 0x648cc90c 16 QWidgetBackingStore::sync qwidgetbackingstore.cpp 1093 0x64890c36 17 QWidgetPrivate::syncBackingStore qwidget.cpp 1678 0x648ce501 18 QWidgetWindow::handleResizeEvent qwidgetwindow.cpp 539 0x6490051b 19 QWidgetWindow::event qwidgetwindow.cpp 181 0x648ff61a 20 QApplicationPrivate::notify_helper qapplication.cpp 3457 0x6488131e 21 QApplication::notify qapplication.cpp 2878 0x6487d58c 22 QCoreApplication::notifyInternal qcoreapplication.cpp 867 0x66c7fdc4 23 QCoreApplication::sendSpontaneousEvent qcoreapplication.h 235 0x66d91938 24 QGuiApplicationPrivate::processGeometryChangeEvent qguiapplication.cpp 1747 0x9472ed ... <More>
I can reproduce the crash also on Linux.
Additional Information: This crash occurs only when QWindows(with OpenGL SurfaceType) or QGLWidget is used in the webkit plugin. If the below line is commented out in the attached sample application, the crash does not occur. //m_view->setViewport(new QGLWidget()); On Mac on resizing the application, the below warning messages appear but the application does not crash. QWidget::repaint: Recursive repaint detected