54142 2011-02-09 14:07:22 -0800 Crash in DrawingAreaProxyImpl::paint when WKView paints after being resized while hidden 2011-02-10 14:52:06 -0800 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) All All RESOLVED FIXED InRadar P2 Normal --- 54141 53805 1 aroben webkit-unassigned andersca oldest_to_newest 348554 0 aroben 2011-02-09 14:07:22 -0800 If WKView is resized while hidden (and you don't run into bug 54141, because it's been fixed), and is then shown and asked to paint, you'll crash inside DrawingAreaProxyImpl::paint due to a null BackingStore. The crashing line is this: m_backingStore->paint(context, rect); m_backingStore is null. Here's the backtrace: > WebKit.dll!WTF::OwnPtr<WebKit::BackingStore>::operator->() Line 66 + 0x35 bytes C++ WebKit.dll!WebKit::DrawingAreaProxyImpl::paint(HDC__ * context=0xaa011176, const WebCore::IntRect & rect={...}, WebKit::Region & unpaintedRegion={...}) Line 83 + 0x13 bytes C++ WebKit.dll!WebKit::WebView::onPaintEvent(HWND__ * hWnd=0x00120418, unsigned int message=15, unsigned int __formal=0, unsigned int __formal=0, bool & handled=true) Line 427 C++ WebKit.dll!WebKit::WebView::wndProc(HWND__ * hWnd=0x00120418, unsigned int message=15, unsigned int wParam=0, long lParam=0) Line 127 + 0x1c bytes C++ WebKit.dll!WebKit::WebView::WebViewWndProc(HWND__ * hWnd=0x00120418, unsigned int message=15, unsigned int wParam=0, long lParam=0) Line 97 + 0x18 bytes C++ user32.dll!_InternalCallWinProc@20() + 0x28 bytes 348555 1 aroben 2011-02-09 14:08:06 -0800 <rdar://problem/8979365> 348562 2 81874 aroben 2011-02-09 14:16:04 -0800 Created attachment 81874 Notice when the backing store goes away after DidSetSize 348945 3 aroben 2011-02-10 04:43:16 -0800 Committed r78199: <http://trac.webkit.org/changeset/78199> 349401 4 andersca 2011-02-10 14:50:38 -0800 *** Bug 54247 has been marked as a duplicate of this bug. *** 81874 2011-02-09 14:16:04 -0800 2011-02-09 15:31:22 -0800 Notice when the backing store goes away after DidSetSize bug-54142-20110209171601.patch text/plain 4223 aroben U3VidmVyc2lvbiBSZXZpc2lvbjogNzgwNTQKZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJLaXQyL0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQyL0NoYW5nZUxvZwppbmRleCBkZWFkNzBmMGYwZGU2Nzhl NTYxOTRjMjM3MjdmZDMwNTVlMzI3ZTFjLi4yZDU2YTc3MTkxNmQ0YWVmZGE4OGE4ZmYyY2MwMmQ4 ZWE5NDdmY2I0IDEwMDY0NAotLS0gYS9Tb3VyY2UvV2ViS2l0Mi9DaGFuZ2VMb2cKKysrIGIvU291 cmNlL1dlYktpdDIvQ2hhbmdlTG9nCkBAIC0xLDUgKzEsMjEgQEAKIDIwMTEtMDItMDkgIEFkYW0g Um9iZW4gIDxhcm9iZW5AYXBwbGUuY29tPgogCisgICAgICAgIE5vdGljZSB3aGVuIHRoZSBiYWNr aW5nIHN0b3JlIGdvZXMgYXdheSBhZnRlciBEaWRTZXRTaXplCisKKyAgICAgICAgRml4ZXMgPGh0 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