Created attachment 468552 [details]
crash log

I'm observing GPU proces crash with Windows Debug 270468@main by running layout tests

> python .\Tools\Scripts\run-webkit-tests --debug --iter=100 -f --no-retry --no-show compositing/shared-backing/backing-sharing-compositing-change.html compositing/shared-backing/move-sharing-child.html

or

> python .\Tools\Scripts\run-webkit-tests --debug --iter=10 -f --no-retry --no-show compositing/shared-backing

Stderr:

> Could not create EGL context.

Callstack:

    Frame[00]  Triage Symbol: [WebCore!WebCore::GLContext::makeContextCurrent+0x18]
    Frame[01]  Triage Symbol: [WebKit2!WebKit::WCSceneContext::makeContextCurrent+0x1c]
    Frame[02]  Triage Symbol: [WebKit2!WebKit::WCScene::initialize+0x39]
    Frame[03]  Triage Symbol: [WebKit2!WebKit::RemoteWCLayerTreeHost::RemoteWCLayerTreeHost::<lambda_0>::operator+0x65]
    Frame[04]  Triage Symbol: [WebKit2!WTF::Detail::CallableWrapper<`lambda at C:\webkit\Source\WebKit\GPUProcess\graphics\wc\RemoteWCLayerTreeHost.cpp:69:46',void>::call+0x17]
    Frame[05]  Triage Symbol: [WebKit2!WTF::Function<void ()>::operator+0x85]
    Frame[06]  Triage Symbol: [WebKit2!IPC::StreamConnectionWorkQueue::processStreams+0x121]
    Frame[07]  Triage Symbol: [WebKit2!IPC::StreamConnectionWorkQueue::startProcessingThread::<lambda_0>::operator+0x2f]
    Frame[08]  Triage Symbol: [WebKit2!WTF::Detail::CallableWrapper<`lambda at C:\webkit\Source\WebKit\Platform\IPC\StreamConnectionWorkQueue.cpp:123:17',void>::call+0x17]
    Frame[09]  Triage Symbol: [WTF!WTF::Function<void ()>::operator+0x84]
    Frame[0a]  Triage Symbol: [WTF!WTF::Thread::entryPoint+0x1cb]
    Frame[0b]  Triage Symbol: [WTF!WTF::wtfThreadEntryPoint+0x13]
    Frame[0c]  Triage Symbol: [ucrtbase!thread_start<unsigned int (__cdecl*)(void *),1>+0x42]
    Frame[0d]  Triage Symbol: [KERNEL32!BaseThreadInitThunk+0x14]
    Frame[0e]  Triage Symbol: [ntdll!RtlUserThreadStart+0x21]