[Webkit-unassigned] [Bug 17418] New: REGRESSION: Assertion failure dragging image (JSLock::lockCount() > 0)

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=17418

           Summary: REGRESSION: Assertion failure dragging image
                    (JSLock::lockCount() > 0)
           Product: WebKit
           Version: 525+ (Nightly build)
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Keywords: Regression
          Severity: Normal
          Priority: P1
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: webkit at mattlilek.com


Dragging an image in ToT on Windows fails the following ASSERT in
UString::Rep::createCopying:

JSLock::lockCount() > 0
<http://trac.webkit.org/projects/webkit/browser/trunk/JavaScriptCore/kjs/ustring.cpp#L175>

>	WebKit.dll!KJS::UString::Rep::createCopying(const KJS::UChar * d=0x03f2a4e0, int l=77)  Line 175 + 0x25 bytes	C++
        WebKit.dll!KJS::UString::UString(const KJS::UChar * c=0x03f2a4e0, int
length=77)  Line 442 + 0x11 bytes C++
        WebKit.dll!WebCore::String::operator KJS::UString()  Line 644 + 0x28
bytes      C++
        WebKit.dll!WebCore::KURL::operator KJS::UString()  Line 140 + 0x23
bytes        C++
       
WebKit.dll!WebCore::ClipboardWin::declareAndWriteDragImage(WebCore::Element *
element=0x029b03f8, const WebCore::KURL & url={...}, const WebCore::String &
title={...}, WebCore::Frame * frame=0x01e1b4f0)  Line 677 + 0x34 bytes      
C++
        WebKit.dll!WebCore::prepareClipboardForImageDrag(WebCore::Frame *
src=0x01e1b4f0, WebCore::Clipboard * clipboard=0x0269c410, WebCore::Element *
node=0x029b03f8, const WebCore::KURL & linkURL={...}, const WebCore::KURL &
imageURL={...}, const WebCore::String & label={...})  Line 558 + 0x42 bytes C++
        WebKit.dll!WebCore::DragController::startDrag(WebCore::Frame *
src=0x01e1b4f0, WebCore::Clipboard * clipboard=0x0269c410,
WebCore::DragOperation srcOp=DragOperationNone, const
WebCore::PlatformMouseEvent & dragEvent={...}, const WebCore::IntPoint &
dragOrigin={...}, bool isDHTMLDrag=false)  Line 635 + 0x2f bytes       C++
        WebKit.dll!WebCore::EventHandler::handleDrag(const
WebCore::MouseEventWithHitTestResults & event={...})  Line 1755 + 0x44 bytes
C++
        WebKit.dll!WebCore::EventHandler::handleMouseDraggedEvent(const
WebCore::MouseEventWithHitTestResults & event={...})  Line 353 + 0xc bytes     
C++
        WebKit.dll!WebCore::EventHandler::handleMouseMoveEvent(const
WebCore::PlatformMouseEvent & mouseEvent={...}, WebCore::HitTestResult *
hoveredNode=0x0012f7a4)  Line 1034 + 0xc bytes    C++
        WebKit.dll!WebCore::EventHandler::mouseMoved(const
WebCore::PlatformMouseEvent & event={...})  Line 938 + 0x10 bytes    C++
        WebKit.dll!WebView::handleMouseEvent(unsigned int message=512, unsigned
int wParam=1, long lParam=11534604)  Line 1216 + 0x1d bytes     C++
        WebKit.dll!WebViewWndProc(HWND__ * hWnd=0x00050112, unsigned int
message=512, unsigned int wParam=1, long lParam=11534604)  Line 1634 + 0x14
bytes      C++
        user32.dll!7e418724()   
        [Frames below may be incorrect and/or missing, no symbols loaded for
user32.dll]


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