Bug 267911

Buildbot: builder WinCairo-64-bit-Debug-Tests build 21705 : 273341@main https://build.webkit.org/#/builders/727/builds/21705 ASSERTION FAILED: activeViewTransition C:\BW\WinCairo-64-bit-Debug-Build\build\Source\WebCore\rendering/updating/RenderTreeUpdaterViewTransition.cpp(69) : updatePseudoElementTree 1 00007FF903601B99 WTFCrash 2 00007FF8D8E6730D WTFCrashWithInfo 3 00007FF8DD23F77E WebCore::RenderTreeUpdater::ViewTransition::updatePseudoElementTree 4 00007FF8DD23ED66 WebCore::RenderTreeUpdater::updateAfterDescendants 5 00007FF8DD23EC4B WebCore::RenderTreeUpdater::popParent 6 00007FF8DD23E0E9 WebCore::RenderTreeUpdater::popParentsToDepth 7 00007FF8DD23DD73 WebCore::RenderTreeUpdater::updateRenderTree 8 00007FF8DD23D545 WebCore::RenderTreeUpdater::commit 9 00007FF8DB8FF81C WebCore::Document::updateRenderTree 10 00007FF8DB8FFFD9 WebCore::Document::resolveStyle 11 00007FF8DB900821 WebCore::Document::updateStyleIfNeeded 12 00007FF8DB91C0C5 WebCore::Document::finishedParsing 13 00007FF8DC0409C9 WebCore::HTMLConstructionSite::finishedParsing 14 00007FF8DC09E6C7 WebCore::HTMLTreeBuilder::finished 15 00007FF8DC046B49 WebCore::HTMLDocumentParser::end 16 00007FF8DC0453C9 WebCore::HTMLDocumentParser::attemptToRunDeferredScriptsAndEnd 17 00007FF8DC045115 WebCore::HTMLDocumentParser::prepareToStopParsing 18 00007FF8DC046B90 WebCore::HTMLDocumentParser::attemptToEnd 19 00007FF8DC046BE2 WebCore::HTMLDocumentParser::finish 20 00007FF8DC491947 WebCore::DocumentWriter::end 21 00007FF8DC4908A6 WebCore::DocumentLoader::finishedLoading 22 00007FF8DC49055D WebCore::DocumentLoader::notifyFinished 23 00007FF8DC5FFB60 WebCore::CachedResource::checkNotify 24 00007FF8DC5FBF61 WebCore::CachedResource::finishLoading 25 00007FF8DC5FD5AB WebCore::CachedRawResource::finishLoading 26 00007FF8DC582F52 WebCore::SubresourceLoader::didFinishLoading 27 00007FF8EBDC890E WebKit::WebResourceLoader::didFinishResourceLoad 28 00007FF8EABA1A20 IPC::callMemberFunction<WebKit::WebResourceLoader,WebKit::WebResourceLoader,void (WebCore::NetworkLoadMetrics &&),std::tuple<WebCore::NetworkLoadMetrics> >::<lambda_1>::operator()<WebCore::NetworkLoadMetrics> 29 00007FF8EABA19DD std::invoke<`lambda at C:\BW\WinCairo-64-bit-Debug-Build\build\Source\WebKit\Platform\IPC\HandleMessage.h:135:9',WebCore::NetworkLoadMetrics> 30 00007FF8EABA19BA std::_Apply_impl<`lambda at C:\BW\WinCairo-64-bit-Debug-Build\build\Source\WebKit\Platform\IPC\HandleMessage.h:135:9',std::tuple<WebCore::NetworkLoadMetrics>,0> 31 00007FF8EABA1982 std::apply<`lambda at C:\BW\WinCairo-64-bit-Debug-Build\build\Source\WebKit\Platform\IPC\HandleMessage.h:135:9',std::tuple<WebCore::NetworkLoadMetrics> > C:\BW\WinCairo-64-bit-Debug-Build\build\Source\WebKit\UIProcess/WebProcessProxy.cpp(1101) : didClose ERROR: 000001F271C6A310 - [PID=14856] WebProcessProxy::processDidTerminateOrFailedToLaunch: reason=Crash C:\BW\WinCairo-64-bit-Debug-Build\build\Source\WebKit\UIProcess/WebProcessProxy.cpp(1109) : processDidTerminateOrFailedToLaunch ERROR: 000001F271C43B50 - [pageProxyID=7, webPageID=8, PID=14856] WebPageProxy::processDidTerminate: (pid 14856), reason=Crash C:\BW\WinCairo-64-bit-Debug-Build\build\Source\WebKit\UIProcess/WebPageProxy.cpp(9290) : resetStateAfterProcessTermination ERROR: 000001F271C43B50 - [pageProxyID=7, webPageID=8, PID=14856] WebPageProxy::dispatchProcessDidTerminate: reason=Crash C:\BW\WinCairo-64-bit-Debug-Build\build\Source\WebKit\UIProcess/WebPageProxy.cpp(9348) : dispatchProcessDidTerminate WebProcess terminated (pid 14856) for reason: crash #CRASHED - WebProcess (pid 14856)