[Webkit-unassigned] [Bug 121139] New: [Qt][Windows] Crash on resizing Webkit plugin

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=121139

           Summary: [Qt][Windows] Crash on resizing Webkit plugin
           Product: WebKit
           Version: 525.x (Safari 3.2)
          Platform: PC
        OS/Version: Windows 7
            Status: UNCONFIRMED
          Severity: Critical
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ssuresh at esri.com


Created an attachment (id=211277)
 --> (https://bugs.webkit.org/attachment.cgi?id=211277&action=review)
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>

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