[Webkit-unassigned] [Bug 79019] New: Webkit Crashes on youtube when connected to ProgressBar

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=79019

           Summary: Webkit Crashes on youtube when connected to
                    ProgressBar
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Windows 7
            Status: UNCONFIRMED
          Severity: Critical
          Priority: P1
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: marcin at infobox.com.pl


Created an attachment (id=127781)
 --> (https://bugs.webkit.org/attachment.cgi?id=127781&action=review)
Backtrace

Our web browser based on QtWebkit sometimes crashes on youtube when i connect Signal loadProgress to QProgressBar. 
It has something to do with google ads because i can reproduce crash in arora browser only if AdBlock is disabled.
Today i can reproduce crash on http://www.youtube.com/watch?v=Hpn9y_erKgk . 
In firefox i see ad in right part of this webpage, but QtWebkit based browser crasher before this is loaded.


Example code:
    QWebView *view = new QWebView();
    view->load(QUrl("http://www.youtube.com/watch?v=Hpn9y_erKgk")); //on this webpage i can reproduce crash

    QProgressBar *progress = new QProgressBar();
    progress->setRange(0, 100);
    connect(view->page(), SIGNAL(loadProgress(int)), progress, SLOT(setValue(int))); //if I comment this line app will not crash

    QVBoxLayout *layout = new QVBoxLayout();
    layout->addWidget(view);
    layout->addWidget(progress);
    setLayout(layout);

Backtrace:
In attachment


Platform:
Windows 7, Qt 4.8.0

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