311123 2026-03-30 11:42:19 -0700 [Site Isolation] Web Inspector: Layout tests with cross-origin iframes crash due to assertion failure: !globalObject->debugger() 2026-04-22 16:18:00 -0700 1 1 1 Unclassified WebKit Web Inspector WebKit Nightly Build All All RESOLVED FIXED InRadar P2 Normal --- 1 qianlangchen webkit-unassigned a_panta inspector-bugzilla-changes webkit-bug-importer oldest_to_newest 2195234 0 qianlangchen 2026-03-30 11:42:19 -0700 On a debug build, run run-webkit-tests --debug --no-build --no-retry-failures --no-show-results --full-diff-context --child-processes=1 --timeout=25000 --force --exit-after-n-failures=1 LayoutTests/http/tests/site-isolation/inspector/debugger/pause-in-cross-origin-iframe.html Or theoretically most other Web Inspector test for site isolation, resulting in the following crash log: ASSERTION FAILED: !globalObject->debugger() /Users/qianlang_chen1/WebKit/OpenSource/Source/JavaScriptCore/debugger/Debugger.cpp(168) : void JSC::Debugger::attach(JSGlobalObject *) 1 0x131dc24ec JSC::Debugger::attach(JSC::JSGlobalObject*) 2 0x7000128f50 WebCore::JSWindowProxy::attachDebugger(JSC::Debugger*) 3 0x7005043698 WebCore::WindowProxy::attachDebugger(JSC::Debugger*) 4 0x70072a4480 WebCore::Page::setDebugger(JSC::Debugger*) 5 0x70069e2d08 WebCore::PageDebugger::attachDebugger() 6 0x131dc3410 JSC::Debugger::addObserver(JSC::Debugger::Observer&) 7 0x1326911cc Inspector::InspectorDebuggerAgent::internalEnable() 8 0x7006b236ac WebCore::WebDebuggerAgent::internalEnable() 9 0x7006b6ae8c WebCore::PageDebuggerAgent::internalEnable() 10 0x132691c6c Inspector::InspectorDebuggerAgent::enable() 11 0x13259876c Inspector::DebuggerBackendDispatcher::enable(long, WTF::RefPtr<WTF::JSONImpl::Object, WTF::RawPtrTraits<WTF::JSONImpl::Object>, WTF::DefaultRefDerefTraits<WTF::JSONImpl::Object>>&&) 12 0x132598654 Inspector::DebuggerBackendDispatcher::dispatch(long, WTF::String const&, WTF::Ref<WTF::JSONImpl::Object, WTF::RawPtrTraits<WTF::JSONImpl::Object>, WTF::DefaultRefDerefTraits<WTF::JSONImpl::Object>>&&) 13 0x132572c38 Inspector::BackendDispatcher::dispatch(WTF::String const&) 14 0x70069e63e4 WebCore::PageInspectorController::dispatchMessageFromFrontend(WTF::String const&) 15 0x11e105028 WebKit::PageInspectorTarget::sendMessageToTargetBackend(WTF::String const&) 16 0x11e5dff44 WebKit::WebPage::sendMessageToTargetBackend(WTF::String const&) 17 0x11bb83028 auto void IPC::callMemberFunction<WebKit::WebPage, WebKit::WebPage, void (WTF::String const&), std::__1::tuple<WTF::String>>(WebKit::WebPage*, void (WebKit::WebPage::*)(WTF::String const&), std::__1::tuple<WTF::String>&&)::'lambda'(auto&&...)::operator()<WTF::String>(auto&&...) const 18 0x11bb82f60 std::__1::__invoke_result_impl<void, auto...>::type std::__1::__invoke[abi:sqn220100]<void IPC::callMemberFunction<WebKit::WebPage, WebKit::WebPage, void (WTF::String const&), std::__1::tuple<WTF::String>>(WebKit::WebPage*, void (WebKit::WebPage::*)(WTF::String const&), std::__1::tuple<WTF::String>&&)::'lambda'(auto&&...), WTF::String>(auto&&...) 19 0x11bb82f30 decltype(auto) std::__1::__apply_tuple_impl[abi:sqn220100]<void IPC::callMemberFunction<WebKit::WebPage, WebKit::WebPage, void (WTF::String const&), std::__1::tuple<WTF::String>>(WebKit::WebPage*, void (WebKit::WebPage::*)(WTF::String const&), std::__1::tuple<WTF::String>&&)::'lambda'(auto&&...), std::__1::tuple<WTF::String>, 0ul>(WebKit::WebPage&&, WebKit::WebPage&&, std::__1::integer_sequence<unsigned long, 0ul>) 20 0x11bb82ef0 decltype(auto) std::__1::apply[abi:sqn220100]<void IPC::callMemberFunction<WebKit::WebPage, WebKit::WebPage, void (WTF::String const&), std::__1::tuple<WTF::String>>(WebKit::WebPage*, void (WebKit::WebPage::*)(WTF::String const&), std::__1::tuple<WTF::String>&&)::'lambda'(auto&&...), std::__1::tuple<WTF::String>>(WebKit::WebPage&&, WebKit::WebPage&&) 21 0x11bb82ec0 void IPC::callMemberFunction<WebKit::WebPage, WebKit::WebPage, void (WTF::String const&), std::__1::tuple<WTF::String>>(WebKit::WebPage*, void (WebKit::WebPage::*)(WTF::String const&), std::__1::tuple<WTF::String>&&) 22 0x11ba9e108 void IPC::handleMessage<Messages::WebPage::SendMessageToTargetBackend, IPC::Connection, WebKit::WebPage, WebKit::WebPage, void (WTF::String const&)>(IPC::Connection&, IPC::Decoder&, WebKit::WebPage*, void (WebKit::WebPage::*)(WTF::String const&)) 23 0x11992c8cc WebKit::WebPage::didReceiveMessage(IPC::Connection&, IPC::Decoder&) 24 0x119902a6c IPC::MessageReceiverMap::dispatchMessage(IPC::Connection&, IPC::Decoder&) 25 0x11cd7758c WebKit::AuxiliaryProcess::dispatchMessage(IPC::Connection&, IPC::Decoder&) 26 0x11994897c WebKit::AuxiliaryProcess::didReceiveMessage(IPC::Connection&, IPC::Decoder&) 27 0x11992282c WebKit::WebProcess::didReceiveMessage(IPC::Connection&, IPC::Decoder&) 28 0x11e9e964c IPC::Connection::dispatchMessage(IPC::Decoder&) 29 0x11e9e9b84 IPC::Connection::dispatchMessage(WTF::UniqueRef<IPC::Decoder>) 30 0x1199570fc IPC::Connection::dispatchOneIncomingMessage() 31 0x11ea4a1e4 IPC::Connection::enqueueIncomingMessage(WTF::UniqueRef<IPC::Decoder>)::$_1::operator()() const com.apple.WebKit.WebContent.Development terminated (pid 68249) for reason: crash 2195285 1 webkit-bug-importer 2026-03-30 14:27:30 -0700 <rdar://problem/173722593> 2202926 2 a_panta 2026-04-21 15:39:50 -0700 Pull request: https://github.com/WebKit/WebKit/pull/63276 2203427 3 ews-feeder 2026-04-22 16:17:58 -0700 Committed 311811@main (9fcb2bb3c70e): <https://commits.webkit.org/311811@main> Reviewed commits have been landed. Closing PR #63276 and removing active labels.