[Webkit-unassigned] [Bug 103845] New: REGRESSION(r134376): ASSERT(!m_mainBackingStore) hits in CoordinatedGraphicsLayer::syncImageBacking().

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=103845

           Summary: REGRESSION(r134376): ASSERT(!m_mainBackingStore) hits
                    in CoordinatedGraphicsLayer::syncImageBacking().
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: luxtella at company100.net


When loading http://www.webkit.org/blog-files/leaves/index.html, we can encounter following crash on Qt WK2.

ASSERTION FAILED: !m_mainBackingStore
/media/WDDisk/workspace/WebKit/WebKit/Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/CoordinatedGraphicsLayer.cpp(489) : void WebCore::CoordinatedGraphicsLayer::syncImageBacking()
1   0x7ffff751c6ae /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/libWebKit2.so.1(_ZN7WebCore24CoordinatedGraphicsLayer16syncImageBackingEv+0x8e) [0x7ffff751c6ae]
2   0x7ffff751ce06 /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/libWebKit2.so.1(_ZN7WebCore24CoordinatedGraphicsLayer37flushCompositingStateForThisLayerOnlyEv+0x18) [0x7ffff751ce06]
3   0x7ffff751c42c /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/libWebKit2.so.1(_ZN7WebCore24CoordinatedGraphicsLayer21flushCompositingStateERKNS_9FloatRectE+0xbe) [0x7ffff751c42c]
4   0x7ffff751c46d /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/libWebKit2.so.1(_ZN7WebCore24CoordinatedGraphicsLayer21flushCompositingStateERKNS_9FloatRectE+0xff) [0x7ffff751c46d]
5   0x7ffff751c46d /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/libWebKit2.so.1(_ZN7WebCore24CoordinatedGraphicsLayer21flushCompositingStateERKNS_9FloatRectE+0xff) [0x7ffff751c46d]
6   0x7ffff751c46d /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/libWebKit2.so.1(_ZN7WebCore24CoordinatedGraphicsLayer21flushCompositingStateERKNS_9FloatRectE+0xff) [0x7ffff751c46d]
7   0x7ffff2f7bf6c /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/../lib/libWebCore.so.1(_ZN7WebCore21RenderLayerCompositor24flushPendingLayerChangesEb+0x23e) [0x7ffff2f7bf6c]
8   0x7ffff2caa8cb /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/../lib/libWebCore.so.1(_ZN7WebCore9FrameView33flushCompositingStateForThisFrameEPNS_5FrameE+0xe3) [0x7ffff2caa8cb]
9   0x7ffff2caac05 /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/../lib/libWebCore.so.1(_ZN7WebCore9FrameView39flushCompositingStateIncludingSubframesEv+0x31) [0x7ffff2caac05]
10  0x7ffff7525b96 /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/libWebKit2.so.1(_ZN6WebKit20LayerTreeCoordinator24flushPendingLayerChangesEv+0x13a) [0x7ffff7525b96]
11  0x7ffff75268aa /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/libWebKit2.so.1(_ZN6WebKit20LayerTreeCoordinator26performScheduledLayerFlushEv+0xc2) [0x7ffff75268aa]
12  0x7ffff75269a2 /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/libWebKit2.so.1(_ZN6WebKit20LayerTreeCoordinator20layerFlushTimerFiredEPN7WebCore5TimerIS0_EE+0x1c) [0x7ffff75269a2]
13  0x7ffff7532644 /media/WDDisk/workspace/WebKit/WebKit/WebKitBuild/qt5/Debug/lib/libWebKit2.so.1(_ZN7WebCore5TimerIN6WebKit20LayerTreeCoordinatorEE5firedEv+0x6c) [0x7ffff7532644]

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