ASSERTION FAILED: !shouldAllowResourceToAskForCredentials()
./loader/ResourceLoader.cpp(491) : void WebCore::ResourceLoader::didBlockAuthenticationChallenge()
1   0x1d268df59 WTFCrash
2   0x1b52f7d8b WTFCrashWithInfo(int, char const*, char const*, int)
3   0x1b8841283 WebCore::ResourceLoader::didBlockAuthenticationChallenge()
4   0x1a95d218f WebKit::WebResourceLoader::didBlockAuthenticationChallenge()
5   0x1a9bd45d4 void IPC::callMemberFunctionImpl<WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(), std::__1::tuple<> >(WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(), std::__1::tuple<>&&, std::__1::integer_sequence<unsigned long>)
6   0x1a9bd4530 void IPC::callMemberFunction<WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(), std::__1::tuple<>, std::__1::integer_sequence<unsigned long> >(std::__1::tuple<>&&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)())
7   0x1a9bd1db6 void IPC::handleMessage<Messages::WebResourceLoader::DidBlockAuthenticationChallenge, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)()>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)())
8   0x1a9bd14be WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&)
9   0x1a958d516 WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&)
10  0x1a8074759 IPC::Connection::dispatchMessage(IPC::Decoder&)
11  0x1a80750b2 IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)
12  0x1a8075790 IPC::Connection::dispatchOneIncomingMessage()
13  0x1a8094bfe IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_7::operator()()
14  0x1a8094b0e WTF::Detail::CallableWrapper<IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_7, void>::call()
15  0x1d26b91a2 WTF::Function<void ()>::operator()() const
16  0x1d2732f08 WTF::RunLoop::performWork()
17  0x1d2734691 WTF::RunLoop::performWork(void*)
18  0x7fff34998f12 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
19  0x7fff34998eb1 __CFRunLoopDoSource0
20  0x7fff34998ccb __CFRunLoopDoSources0
21  0x7fff349979fa __CFRunLoopRun
22  0x7fff34996ffe CFRunLoopRunSpecific
23  0x7fff3702b2a8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:]
24  0x7fff370ddd2f -[NSRunLoop(NSRunLoop) run]
25  0x7fff6eb2e51a _xpc_objc_main.cold.4
26  0x7fff6eb2e460 _xpc_objc_main
27  0x7fff6eb2df93 _xpc_copy_xpcservice_dictionary
28  0x1a88ce28b WebKit::XPCServiceMain(int, char const**)
29  0x1a9c82e6b WKXPCServiceMain
30  0x10a88aec2 main
31  0x7fff6e8e0cc9 start
LEAK: 1 WebPageProxy

this is seen with http/tests/security/basic-auth-module-propagate.html and http/tests/security/basic-auth-module.html, which were recently added with https://trac.webkit.org/changeset/260003/webkit