Bug 272452 – [WebXR][WPE] REGRESSION(276825@main): ASSERTION FAILED: `gl.checkFramebufferStatus(GL::READ_FRAMEBUFFER) == GL::FRAMEBUFFER_COMPLETE` in `WebXROpaqueFramebuffer::resolveMSAAFramebuffer()`

• Component: WebXR
• Status: RESOLVED FIXED

[Vitaly Dyackhov]

Stack trace:
```
STDERR: 1   0x7f769cea38b6 WTFCrash
STDERR: 2   0x7f76991f5ef0 WTF::isIntegralOrPointerType()
STDERR: 3   0x7f769f5762a3 WebCore::WebXROpaqueFramebuffer::resolveMSAAFramebuffer(WebCore::GraphicsContextGL&)
STDERR: 4   0x7f769f57657c WebCore::WebXROpaqueFramebuffer::blitShared(WebCore::GraphicsContextGL&)
STDERR: 5   0x7f769f5760c1 WebCore::WebXROpaqueFramebuffer::endFrame()
STDERR: 6   0x7f769f5967f4 WebCore::WebXRWebGLLayer::endFrame()
STDERR: 7   0x7f769f57b3c8 operator()
STDERR: 8   0x7f769f593008 call
STDERR: 9   0x7f7699b19e6f WTF::Function<void ()>::operator()() const
STDERR: 10  0x7f769f56f3b8 WebCore::ActiveDOMObject::queueTaskKeepingObjectAlive<WebCore::WebXRSession>(WebCore::WebXRSession&, WebCore::TaskSource, WTF::Function<void ()>&&)::{lambda()#1}::operator()() const
STDERR: 11  0x7f769f573ea4 WTF::Detail::CallableWrapper<WebCore::ActiveDOMObject::queueTaskKeepingObjectAlive<WebCore::WebXRSession>(WebCore::WebXRSession&, WebCore::TaskSource, WTF::Function<void ()>&&)::{lambda()#1}, void>::call()
STDERR: 12  0x7f7699b19e6f WTF::Function<void ()>::operator()() const
STDERR: 13  0x7f76a012994e WebCore::EventLoopFunctionDispatchTask::execute()
STDERR: 14  0x7f76a0128a3f WebCore::EventLoop::run(std::optional<WTF::ApproximateTime>)
STDERR: 15  0x7f76a02b4be1 WebCore::WindowEventLoop::didReachTimeToRun()
STDERR: 16  0x7f76a02cc086 void std::__invoke_impl<void, void (WebCore::WindowEventLoop::*&)(), WebCore::WindowEventLoop*&>(std::__invoke_memfun_deref, void (WebCore::WindowEventLoop::*&)(), WebCore::WindowEventLoop*&)
STDERR: 17  0x7f76a02cbff1 std::__invoke_result<void (WebCore::WindowEventLoop::*&)(), WebCore::WindowEventLoop*&>::type std::__invoke<void (WebCore::WindowEventLoop::*&)(), WebCore::WindowEventLoop*&>(void (WebCore::WindowEventLoop::*&)(), WebCore::WindowEventLoop*&)
STDERR: 18  0x7f76a02cbf67 void std::_Bind<void (WebCore::WindowEventLoop::*(WebCore::WindowEventLoop*))()>::__call<void, , 0ul>(std::tuple<>&&, std::_Index_tuple<0ul>)
STDERR: 19  0x7f76a02cbef9 void std::_Bind<void (WebCore::WindowEventLoop::*(WebCore::WindowEventLoop*))()>::operator()<, void>()
STDERR: 20  0x7f76a02cbd54 WTF::Detail::CallableWrapper<std::_Bind<void (WebCore::WindowEventLoop::*(WebCore::WindowEventLoop*))()>, void>::call()
STDERR: 21  0x7f7699b19e6f WTF::Function<void ()>::operator()() const
STDERR: 22  0x7f7699bfea62 WebCore::Timer::fired()
STDERR: 23  0x7f76a108a8ee WebCore::ThreadTimers::sharedTimerFiredInternal()
STDERR: 24  0x7f76a108a1cb operator()
STDERR: 25  0x7f76a1094240 call
STDERR: 26  0x7f7699b19e6f WTF::Function<void ()>::operator()() const
STDERR: 27  0x7f76a1036566 WebCore::MainThreadSharedTimer::fired()
STDERR: 28  0x7f76a103f10c void std::__invoke_impl<void, void (WebCore::MainThreadSharedTimer::*&)(), WebCore::MainThreadSharedTimer*&>(std::__invoke_memfun_deref, void (WebCore::MainThreadSharedTimer::*&)(), WebCore::MainThreadSharedTimer*&)
STDERR: 29  0x7f76a103f085 std::__invoke_result<void (WebCore::MainThreadSharedTimer::*&)(), WebCore::MainThreadSharedTimer*&>::type std::__invoke<void (WebCore::MainThreadSharedTimer::*&)(), WebCore::MainThreadSharedTimer*&>(void (WebCore::MainThreadSharedTimer::*&)(), WebCore::MainThreadSharedTimer*&)
STDERR: 30  0x7f76a103effb void std::_Bind<void (WebCore::MainThreadSharedTimer::*(WebCore::MainThreadSharedTimer*))()>::__call<void, , 0ul>(std::tuple<>&&, std::_Index_tuple<0ul>)
STDERR: 31  0x7f76a103ef8d void std::_Bind<void (WebCore::MainThreadSharedTimer::*(WebCore::MainThreadSharedTimer*))()>::operator()<, void>()
```

[Vitaly Dyackhov]

Pull request: https://github.com/WebKit/WebKit/pull/27076

[EWS]

Committed 277419@main (8ee0645671b6): <https://commits.webkit.org/277419@main>

Reviewed commits have been landed. Closing PR #27076 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/126334130>