[Webkit-unassigned] [Bug 39951] New: Crash when using QImage

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=39951

           Summary: Crash when using QImage
           Product: WebKit
           Version: 420+
          Platform: PC
        OS/Version: Windows XP
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: florent.revelut at free.fr


Environment:
- Qt 4.6.2
- Windows XP 

When trying to extract pictures from QwebView, we have incoherent result and sometimes crashes.

Using provided application:
- run setup.bat
- qmake -r
- nmake

Then run (either release or debug).

This will generate a batch of images in subfolder pictures, expressing the differential update (exact position and size is expressed in name file)

Issues:
- some pictures are incoherent : test693_50_261_750_104.png
- clic button : View_fullscreen (the one circled in red in "overview.jpg") and hold it : it crashes.

crash looks like a race condition on FrameView.cpp, line 1013-1014:
    unsigned size = m_repaintRects.size();
    for (unsigned i = 0; i < size; i++)
        ScrollView::repaintContentRectangle(m_repaintRects[i], false);

When the crash happens, size != m_repaintRects.size()

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