[Webkit-unassigned] [Bug 237819] New: [WinCairo][WebGL] Crash in WebKit::WCContentBuffer::platformLayerWillBeDestroyed()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237819

            Bug ID: 237819
           Summary: [WinCairo][WebGL] Crash in
                    WebKit::WCContentBuffer::platformLayerWillBeDestroyed(
                    )
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Hironori.Fujii at sony.com

1. Start WinCairo WK2 MiniBrowser
2. Go to https://webglsamples.org/lots-o-objects/lots-o-objects-draw-elements.html
3. Toggle the "alpha" switch sevaral times
4. Crash

Callstack:

> 0000026ae91a24c0()	Unknown
> WebKit2.dll!WebKit::WCContentBuffer::platformLayerWillBeDestroyed() Line 78	C++
> WebKit2.dll!WebCore::TextureMapperGCGLPlatformLayer::~TextureMapperGCGLPlatformLayer() Line 44	C++
> [External Code]	
> WebKit2.dll!WebCore::GraphicsContextGLANGLE::~GraphicsContextGLANGLE() Line 342	C++
> WebKit2.dll!WebCore::GraphicsContextGLTextureMapper::~GraphicsContextGLTextureMapper() Line 83	C++
> [External Code]	
> WebKit2.dll!WTF::RefCounted<WebCore::GraphicsContextGL,std::default_delete<WebCore::GraphicsContextGL>>::deref() Line 191	C++
> WebKit2.dll!WTF::DefaultRefDerefTraits<WebCore::GraphicsContextGLTextureMapper>::derefIfNotNull(WebCore::GraphicsContextGLTextureMapper * ptr) Line 43	C++
> WebKit2.dll!WTF::RefPtr<WebCore::GraphicsContextGLTextureMapper,WTF::RawPtrTraits<WebCore::GraphicsContextGLTextureMapper>,WTF::DefaultRefDerefTraits<WebCore::GraphicsContextGLTextureMapper>>::operator=(void * __formal) Line 161	C++
> WebKit2.dll!WebKit::RemoteGraphicsContextGL::workQueueUninitialize() Line 133	C++
> WebKit2.dll!`WebKit::RemoteGraphicsContextGL::stopListeningForIPC'::`2'::<lambda_1>::operator()() Line 101	C++
> WebKit2.dll!WTF::Detail::CallableWrapper<`WebKit::RemoteGraphicsContextGL::stopListeningForIPC'::`2'::<lambda_1>,void>::call() Line 53	C++
> WebKit2.dll!WTF::Function<void __cdecl(void)>::operator()() Line 83	C++
> WebKit2.dll!IPC::StreamConnectionWorkQueue::processStreams() Line 131	C++
> WebKit2.dll!`IPC::StreamConnectionWorkQueue::startProcessingThread'::`2'::<lambda_1>::operator()() Line 108	C++
> WebKit2.dll!WTF::Detail::CallableWrapper<`IPC::StreamConnectionWorkQueue::startProcessingThread'::`2'::<lambda_1>,void>::call() Line 53	C++
> WTF.dll!WTF::Function<void __cdecl(void)>::operator()() Line 83	C++
> WTF.dll!WTF::Thread::entryPoint(WTF::Thread::NewThreadContext * newThreadContext) Line 236	C++
> WTF.dll!WTF::wtfThreadEntryPoint(void * data) Line 151	C++
> [External Code]

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