Happens on a worker thread. Thread[67] EXC_BREAKPOINT (SIGTRAP) (0x0000000000000002, 0x0000000000000000) [ 0] 0x00007fff33a960d3 JavaScriptCore`WTFCrashWithInfo(int, char const*, char const*, int) + 19 at Assertions.h:622:5 [ 1] 0x00007fff33787185 JavaScriptCore`Inspector::InjectedScriptManager::injectedScriptFor(JSC::JSGlobalObject*) + 2133 at InjectedScriptManager.cpp:202:9 198 if (stack.size() > 0) 199 stack[0].computeLineAndColumn(line, column); 200 WTFLogAlways("Error when creating injected script: %s (%d:%d)\n", error->value().toWTFString(globalObject).utf8().data(), line, column); 201 WTFLogAlways("%s\n", injectedScriptSource().utf8().data()); -> 202 RELEASE_ASSERT_NOT_REACHED(); 203 } 204 if (!createResult.value()) { 205 WTFLogAlways("Missing injected script object"); 206 WTFLogAlways("%s\n", injectedScriptSource().utf8().data()); [ 2] 0x00007fff3f7bb846 WebCore`WebCore::InspectorDOMDebuggerAgent::willHandleEvent(WebCore::Event&, WebCore::RegisteredEventListener const&) + 86 at InspectorDOMDebuggerAgent.cpp:218:51 214 if (!m_debuggerAgent->breakpointsActive()) 215 return; 216 217 auto state = event.target()->scriptExecutionContext()->execState(); -> 218 auto injectedScript = m_injectedScriptManager.injectedScriptFor(state); 219 ASSERT(!injectedScript.hasNoValue()); 220 { 221 JSC::JSLockHolder lock(state); 222 [ 3] 0x00007fff3f3e809b WebCore`WebCore::EventTarget::innerInvokeEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener, WTF::DumbPtrTraits<WebCore::RegisteredEventListener> >, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::EventTarget::EventInvokePhase) [inlined] WebCore::InspectorInstrumentation::willHandleEventImpl(WebCore::InstrumentingAgents&, WebCore::Event&, WebCore::RegisteredEventListener const&) + 59 at InspectorInstrumentation.cpp:415:27 411 if (auto* webDebuggerAgent = instrumentingAgents.webDebuggerAgent()) 412 webDebuggerAgent->willHandleEvent(listener); 413 414 if (InspectorDOMDebuggerAgent* domDebuggerAgent = instrumentingAgents.inspectorDOMDebuggerAgent()) -> 415 domDebuggerAgent->willHandleEvent(event, listener); 416 } 417 418 void InspectorInstrumentation::didHandleEventImpl(InstrumentingAgents& instrumentingAgents) 419 {

<rdar://problem/62214651>

There should be some output going to the Console.app when this happens, could you please post it here? That would be "Error when creating injected script", and script content after it. Also, is it possible at all to make and share a reproducible case?

Created attachment 397322 [details] Safari crash screen recording

Here are logs from Console.app: default 07:23:53.429732+0200 com.apple.WebKit.WebContent AudioContext::willBeginPlayback(703282DBC9760CC7) returning false, not processing user gesture or capturing default 07:23:53.674473+0200 hidd [HID] [MT] dispatchEvent Dispatching event with 2 children, _eventMask=0x63 _childEventMask=0x62 Cancel=0 Touching=1 inRange=1 default 07:23:53.680335+0200 com.apple.WebKit.WebContent AudioContext::willBeginPlayback(703282DBC9760CC7) returning false, not processing user gesture or capturing default 07:23:53.894153+0200 hidd [HID] [MT] dispatchEvent Dispatching event with 2 children, _eventMask=0x2 _childEventMask=0x2 Cancel=0 Touching=0 inRange=1 default 07:23:53.930664+0200 com.apple.WebKit.WebContent AudioContext::willBeginPlayback(703282DBC9760CC7) returning false, not processing user gesture or capturing default 07:23:54.123543+0200 com.apple.WebKit.WebContent 0x1101f5000 - [resourceLoader=0x110280900, frameLoader=0x1101dc780, frame=0x110772200, webPageID=33, frameID=25, resourceID=165] WebLoaderStrategy::scheduleLoad: URL will be scheduled with the NetworkProcess default 07:23:54.123599+0200 com.apple.WebKit.WebContent 0x1101f5000 - [resourceLoader=0x110280900, frameLoader=0x1101dc780, frame=0x110772200, webPageID=33, frameID=25, resourceID=165] WebLoaderStrategy::scheduleLoad: Resource is being scheduled with the NetworkProcess (priority=2) default 07:23:54.123677+0200 com.apple.WebKit.WebContent Error when creating injected script: JavaScript execution terminated. (0:0) default 07:23:54.123765+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::startWithServiceWorker: default 07:23:54.123792+0200 com.apple.WebKit.WebContent //# sourceURL=__InjectedScript_InjectedScriptSource.js (function(InjectedScriptHost,inspectedGlobalObject,injectedScriptId){var Object={}.constructor;function toString(obj) {return String(obj);} function toStringDescription(obj) {if(obj===0&&1/obj<0) return"-0";if(isBigInt(obj)) return toString(obj)+"n";return toString(obj);} function isUInt32(obj) {if(typeof obj==="number") return obj>>>0===obj&&(obj>0||1/obj>0);return""+(obj>>>0)===obj;} function isSymbol(value) {return typeof value==="symbol";} function isBigInt(value) {return typeof value==="bigint";} function isEmptyObject(object) {for(let key in object) return false;return true;} function isDefined(value) {return!!value||InjectedScriptHost.isHTMLAllCollection(value);} function isPrimitiveValue(value) {switch(typeof value){case"boolean":case"number":case"string":return true;case"undefined":return!InjectedScriptHost.isHTMLAllCollection(value);default:return false;}} let InjectedScript=class InjectedScript {constructor() {this._lastBoundObjectId=1<…> default 07:23:54.123893+0200 kernel AMFI: SIP is off, allowing core dump for pid 62598 default 07:23:54.123816+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::serviceWorkerDidNotHandle: (fetchIdentifier=0) default 07:23:54.123845+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::start: parentPID=62556, hasNetworkLoadChecker=1 default 07:23:54.123893+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::start: NetworkLoadChecker::check is done default 07:23:54.123927+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::startNetworkLoad: (isFirstLoad=1, timeout=2147483647.000000) default 07:23:54.124330+0200 Safari 0x113aa7300 - WebProcessProxy didClose (web process crash) default 07:23:54.123969+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::startNetworkLoad: Going to the network (description=) default 07:23:54.124473+0200 Safari 0x7faf77822220 - [pageProxyID=32, webPageID=33, PID=62598] WebPageProxy::processDidTerminate: (pid 62598), reason 3 default 07:23:54.124209+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::didReceiveResponse: (httpStatusCode=200, MIMEType=text/javascript, expectedContentLength=212, hasCachedEntryForValidation=0, hasNetworkLoadChecker=1) default 07:23:54.124263+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::didReceiveResponse: Sending WebResourceLoader::DidReceiveResponse IPC (willWaitForContinueDidReceiveResponse=0) default 07:23:54.124368+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::didReceiveResponse: Using response default 07:23:54.124563+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::didReceiveBuffer: Started receiving data (reportedEncodedDataLength=212) default 07:23:54.124614+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::didFinishLoading: (numBytesReceived=212, hasCacheEntryForValidation=0) default 07:23:54.124752+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::tryStoreAsCacheEntry: Not storing cache entry because request is not eligible default 07:23:54.124895+0200 com.apple.WebKit.Networking 0x10f6ff680 - [pageProxyID=32, webPageID=33, frameID=25, resourceID=165, isMainResource=0, isSynchronous=0] NetworkResourceLoader::cleanup: (result=1) default 07:23:54.125696+0200 com.apple.WebKit.Networking TCP Conn 0x7f8076b3f340 canceled default 07:23:54.126729+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 29 { IsNotPlaying } default 07:23:54.126756+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 28 { HasAudioOrVideo } default 07:23:54.125741+0200 com.apple.WebKit.Networking [C35 6F79B883-6EB6-4BBC-9909-589959C4325D Hostname#17663dc7:443 tcp, pid: 62556, legacy-socket] cancel default 07:23:54.126776+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 27 { HasAudioOrVideo } default 07:23:54.126791+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 26 { HasAudioOrVideo } default 07:23:54.126804+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 25 { HasAudioOrVideo } default 07:23:54.126816+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 24 { IsNotPlaying } default 07:23:54.126049+0200 com.apple.WebKit.Networking [C35 6F79B883-6EB6-4BBC-9909-589959C4325D Hostname#17663dc7:443 tcp, pid: 62556, legacy-socket] cancelled [C35.1 C190731D-6400-4CD3-88FC-5A9D09231AF5 192.168.0.52:62280<->IPv4#290e7320:443] Connected Path: satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns Duration: 30.930s, DNS @0.000s took 0.047s, TCP @0.048s took 0.136s bytes in/out: 29454/11156, packets in/out: 67/34, rtt: 0.142s, retransmitted packets: 0, out-of-order packets: 0 default 07:23:54.126832+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 23 { HasAudioOrVideo } default 07:23:54.126162+0200 com.apple.WebKit.Networking 0.000s [C35 6BEFCF24-1273-4BB1-AC88-D6BC21C26B96 Hostname#17663dc7:443 resolver path=satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns] path:start default 07:23:54.126900+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 22 { HasAudioOrVideo } default 07:23:54.126324+0200 com.apple.WebKit.Networking 0.000s [C35 6BEFCF24-1273-4BB1-AC88-D6BC21C26B96 Hostname#17663dc7:443 resolver path=satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns] path:satisfied default 07:23:54.127008+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 21 { HasAudioOrVideo } default 07:23:54.127055+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 20 { HasAudioOrVideo } default 07:23:54.127136+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 19 { IsNotPlaying } default 07:23:54.126491+0200 com.apple.WebKit.Networking 0.000s [C35 6BEFCF24-1273-4BB1-AC88-D6BC21C26B96 Hostname#17663dc7:443 resolver path=satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns] resolver:start_dns default 07:23:54.127191+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 18 { HasAudioOrVideo } default 07:23:54.126626+0200 com.apple.WebKit.Networking 0.047s [C35 6BEFCF24-1273-4BB1-AC88-D6BC21C26B96 Hostname#17663dc7:443 resolver path=satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns] resolver:receive_dns default 07:23:54.127262+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 17 { HasAudioOrVideo } default 07:23:54.126750+0200 com.apple.WebKit.Networking 0.047s [C35.1 C190731D-6400-4CD3-88FC-5A9D09231AF5 192.168.0.52:62280<->IPv4#290e7320:443 socket-flow path=satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns] path:start default 07:23:54.127311+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 16 { HasAudioOrVideo } default 07:23:54.126974+0200 com.apple.WebKit.Networking 0.047s [C35.1 C190731D-6400-4CD3-88FC-5A9D09231AF5 192.168.0.52:62280<->IPv4#290e7320:443 socket-flow path=satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns] path:satisfied default 07:23:54.127422+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 15 { HasAudioOrVideo } default 07:23:54.127538+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 12 { HasAudioOrVideo } default 07:23:54.127693+0200 runningboardd [xpcservice<com.apple.WebKit.WebContent(501)>:62598] Death sentinel fired! default 07:23:54.127211+0200 com.apple.WebKit.Networking 0.048s [C35.1 C190731D-6400-4CD3-88FC-5A9D09231AF5 192.168.0.52:62280<->IPv4#290e7320:443 socket-flow path=satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns] flow:start_connect default 07:23:54.127656+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 11 { HasAudioOrVideo } default 07:23:54.127419+0200 com.apple.WebKit.Networking 0.184s [C35.1 C190731D-6400-4CD3-88FC-5A9D09231AF5 192.168.0.52:62280<->IPv4#290e7320:443 socket-flow path=satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns] flow:finish_connect default 07:23:54.127708+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 10 { HasAudioOrVideo } default 07:23:54.127558+0200 com.apple.WebKit.Networking 0.184s [C35 6BEFCF24-1273-4BB1-AC88-D6BC21C26B96 Hostname#17663dc7:443 resolver path=satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns] flow:finish_connect default 07:23:54.127767+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 9 { IsNotPlaying } default 07:23:54.127685+0200 com.apple.WebKit.Networking 0.184s [C35.1 C190731D-6400-4CD3-88FC-5A9D09231AF5 192.168.0.52:62280<->IPv4#290e7320:443 socket-flow path=satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns] flow:changed_viability default 07:23:54.127882+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 8 { HasAudioOrVideo } default 07:23:54.127877+0200 com.apple.WebKit.Networking 0.184s [C35 6BEFCF24-1273-4BB1-AC88-D6BC21C26B96 Hostname#17663dc7:443 resolver path=satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns] flow:changed_viability default 07:23:54.128014+0200 com.apple.WebKit.Networking 30.930s [C35] path:cancel default 07:23:54.128045+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 7 { HasAudioOrVideo } error 07:23:54.129301+0200 dprivacyd <private>: Disabled by D&U switch default 07:23:54.128213+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 6 { HasAudioOrVideo } default 07:23:54.128921+0200 powerd Process coreaudiod.196 Released PreventUserIdleDisplaySleep "com.apple.audio.context3398.preventuseridledisplaysleep" age:00:02:51 id:21474879257 [System: PrevIdle DeclUser kDisp] default 07:23:54.128369+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 5 { HasAudioOrVideo } default 07:23:54.129153+0200 powerd Process coreaudiod.196 Released PreventUserIdleSystemSleep "com.apple.audio.context3398.preventuseridlesleep" age:00:02:51 id:4295010072 [System: PrevIdle DeclUser kDisp] default 07:23:54.128437+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 4 { IsNotPlaying } default 07:23:54.128703+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 3 { HasAudioOrVideo } default 07:23:54.128972+0200 com.apple.WebKit.Networking nw_flow_disconnected [C35.1 IPv4#290e7320:443 cancelled socket-flow ((null))] Output protocol disconnected default 07:23:54.128849+0200 Safari WebMediaSessionManager::removeAllPlaybackTargetPickerClients 2 { IsNotPlaying } default 07:23:54.129100+0200 Safari 0x7faf77822220 - [pageProxyID=32, webPageID=33, PID=62598] WebPageProxy::dispatchProcessDidTerminate: reason = 3 default 07:23:54.129219+0200 com.apple.WebKit.Networking nw_connection_report_state_with_handler_on_nw_queue [C35] reporting state cancelled error 07:23:54.129189+0200 Safari Process (pid: 0) for committed URL did exit default 07:23:54.129699+0200 Safari 0x7faf77822220 - [pageProxyID=32, webPageID=33, PID=62598] WebPageProxy::reload: default 07:23:54.129806+0200 Safari 0x7faf77822220 - [pageProxyID=32, webPageID=33, PID=62598] WebPageProxy::launchProcessForReload: default 07:23:54.129887+0200 Safari 0x7faf77822220 - [pageProxyID=32, webPageID=33, PID=62598] WebPageProxy::launchProcess:llu default 07:23:54.130265+0200 Safari 0x7faf75024c08 - WebProcessPool::processForRegistrableDomain: Using prewarmed process (process=0x10c6dc300, PID=62604) default 07:23:54.131325+0200 ReportCrash Parsing corpse data for pid 62598 default 07:23:54.131465+0200 ReportCrash Parsing corpse data for process com.apple.WebKit [pid 62598] error 07:23:54.131654+0200 webinspectord XPC Connection Failed for Application: 62598 - PID:62598 - <private> default 07:23:54.131709+0200 webinspectord Application Disconnected: 62598 - PID:62598 - <private> default 07:23:54.145370+0200 Safari 0x113aa7498 - [PID=0] ProcessThrottler::invalidateAllActivities: BEGIN default 07:23:54.145386+0200 Safari 0x113aa7498 - [PID=0] ProcessThrottler::invalidateAllActivities: END default 07:23:54.145634+0200 Safari Target (CURRENTMACHINE) Application (PID:62598) Removed Debuggable (3557DDF9-72B5-4DA3-934A-87CE8AD1E742) default 07:23:54.145661+0200 Safari Target (CURRENTMACHINE) Application (PID:62556) Removed Debuggable (3557DDF9-72B5-4DA3-934A-87CE8AD1E742) default 07:23:54.145683+0200 Safari Target (CURRENTMACHINE) Removed Application (PID:62598) default 07:23:54.157562+0200 mediaremoted Client <MRDMediaRemoteClient 0x7f9cc3e28040, bundleIdentifier = com.apple.WebKit.WebContent, pid = 62598> invalidated. default 07:23:54.157608+0200 launchservicesd QUITTING: pid=62598 asn=0x-0xb12b12 foreground=0 wasFront=0 default 07:23:54.157623+0200 mediaremoted [MRDAgentServer] Clearing agent <private> default 07:23:54.158148+0200 mediaremoted [MRDNowPlayingOriginClient] Removing nowPlayingClient <_MRNowPlayingClientProtobuf: 0x7f9cc3c095a0> { bundleIdentifier = "com.apple.WebKit.WebContent"; nowPlayingVisibility = NeverVisible; processIdentifier = 62598; processUserIdentifier = 501; } for origin-pmikolajczak.local-1280262988/client--0/player-(null) error 07:23:54.158320+0200 ReportCrash Invalid receipt [0 bytes] default 07:23:54.158518+0200 kernel Sandbox: 8 duplicate reports for com.apple.WebKit deny(1) mach-lookup com.apple.CoreDisplay.Notification default 07:23:54.158528+0200 kernel Sandbox: com.apple.WebKit(62604) allow iokit-open RootDomainUserClient default 07:23:54.159637+0200 loginwindow -[PersistentAppsSupport applicationQuit:] | for app:com.apple.WebKit.WebContent, _appTrackingState = 2 How do I test atm: * I open Safari and visit https://app.livewebinar.com/safari-crash-test * I enter some nickname * I open web developer tools (alt+cmd+i), interact with page, for example type something in chat box. * I might take a bit, but after some time Safari tab crashes I have attached movie recording of this issue. Also I am not sure what part of the code is responsible for this crash so at the moment it is hard to provide simple test sample to reproduce it.

I'm able to reproduce this readily and continue to investigate a fix. Thank you for the detailed logs and live test case! 🙏🏼✨

Created attachment 397995 [details] [Patch] WIP Speculative fix that seems to work. Before this change, this was the order of events by adding `WTFReportBacktrace();` inside - the lambda given to the `ScriptExecutionContext::Task` created in `WorkerMessagingProxy::postMessageToWorkerGlobalScope` - in `WorkerScriptController::scheduleExecutionTermination` right before `m_isTerminatingExecution = true;` - in `WorkerScriptController::isTerminatingExecution` right before `return m_isTerminatingExecution;` >>> m_isTerminatingExecution == false 1 0x1975840f5 WebCore::WorkerScriptController::isTerminatingExecution() const 2 0x1996ba5ad WebCore::WorkerRunLoop::Task::performTask(WebCore::WorkerGlobalScope*) 3 0x1996b9ad7 WebCore::WorkerRunLoop::runInMode(WebCore::WorkerGlobalScope*, WebCore::ModePredicate const&, WebCore::WorkerRunLoop::WaitMode) 4 0x1996b96d8 WebCore::WorkerRunLoop::run(WebCore::WorkerGlobalScope*) 5 0x1996bd518 WebCore::WorkerThread::runEventLoop() 6 0x19969e634 WebCore::DedicatedWorkerThread::runEventLoop() 7 0x1996bcfe1 WebCore::WorkerThread::workerThread() 8 0x1996d0118 WebCore::WorkerThread::start(WTF::Function<void (WTF::String const&)>&&)::$_16::operator()() const 9 0x1996d00ce WTF::Detail::CallableWrapper<WebCore::WorkerThread::start(WTF::Function<void (WTF::String const&)>&&)::$_16, void>::call() 10 0x1b06e5792 WTF::Function<void ()>::operator()() const 11 0x1b078be58 WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) 12 0x1b0797588 WTF::wtfThreadEntryPoint(void*) 13 0x7fff6bc80109 _pthread_start 14 0x7fff6bc7bb8b thread_start >>> m_askedToTerminate == true >>> m_isTerminatingExecution = true 1 0x1975842fe WebCore::WorkerScriptController::scheduleExecutionTermination() 2 0x1996b8ce2 WebCore::WorkerThread::stop(WTF::Function<void ()>&&) 3 0x1996b91b0 WebCore::WorkerMessagingProxy::terminateWorkerGlobalScope() 4 0x19969f7f4 WebCore::Worker::terminate() 5 0x1968ede4e WebCore::jsWorkerPrototypeFunctionTerminateBody(JSC::JSGlobalObject*, JSC::CallFrame*, WebCore::JSWorker*, JSC::ThrowScope&) 6 0x196868932 long long WebCore::IDLOperation<WebCore::JSWorker>::call<&(WebCore::jsWorkerPrototypeFunctionTerminateBody(JSC::JSGlobalObject*, JSC::CallFrame*, WebCore::JSWorker*, JSC::ThrowScope&)), (WebCore::CastedThisErrorBehavior)0>(JSC::JSGlobalObject&, JSC::CallFrame&, char const*) 7 0x196868614 WebCore::jsWorkerPrototypeFunctionTerminate(JSC::JSGlobalObject*, JSC::CallFrame*) 8 0x5a8095e011d8 9 0x1b0bdee3f llint_entry 10 0x1b0bbf763 vmEntryToJavaScript 11 0x1b197d277 JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) 12 0x1b197d9f1 JSC::Interpreter::executeCall(JSC::JSGlobalObject*, JSC::JSObject*, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) 13 0x1b1cd51ad JSC::call(JSC::JSGlobalObject*, JSC::JSValue, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) 14 0x1b1cd528f JSC::call(JSC::JSGlobalObject*, JSC::JSValue, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) 15 0x1b1cd5572 JSC::profiledCall(JSC::JSGlobalObject*, JSC::ProfilingReason, JSC::JSValue, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) 16 0x1974c77de WebCore::JSExecState::profiledCall(JSC::JSGlobalObject*, JSC::ProfilingReason, JSC::JSValue, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) 17 0x1974e43bc WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) 18 0x197b33a57 WebCore::EventTarget::innerInvokeEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener, WTF::DumbPtrTraits<WebCore::RegisteredEventListener> >, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::EventTarget::EventInvokePhase) 19 0x197b2fd60 WebCore::EventTarget::fireEventListeners(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) 20 0x197ba6002 WebCore::Node::handleLocalEvents(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) 21 0x197b1e4a1 WebCore::EventContext::handleLocalEvents(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) const 22 0x197b1e6db WebCore::MouseOrFocusEventContext::handleLocalEvents(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) const 23 0x197b1ef6f WebCore::dispatchEventInDOM(WebCore::Event&, WebCore::EventPath const&) 24 0x197b1eaa7 WebCore::EventDispatcher::dispatchEvent(WebCore::Node&, WebCore::Event&) 25 0x197ba605d WebCore::Node::dispatchEvent(WebCore::Event&) 26 0x197ad573e WebCore::Element::dispatchMouseEvent(WebCore::PlatformMouseEvent const&, WTF::AtomString const&, int, WebCore::Element*) 27 0x19869aa1d WebCore::EventHandler::dispatchMouseEvent(WTF::AtomString const&, WebCore::Node*, bool, int, WebCore::PlatformMouseEvent const&, bool) 28 0x19869d8e4 WebCore::EventHandler::handleMouseReleaseEvent(WebCore::PlatformMouseEvent const&) 29 0x199284923 WebCore::UserInputBridge::handleMouseReleaseEvent(WebCore::PlatformMouseEvent const&, WebCore::InputSource) 30 0x1898b6847 WebKit::handleMouseEvent(WebKit::WebMouseEvent const&, WebKit::WebPage*) 31 0x1898b6609 WebKit::WebPage::mouseEvent(WebKit::WebMouseEvent const&) >>> m_isTerminatingExecution == true 1 0x1975840f5 WebCore::WorkerScriptController::isTerminatingExecution() const 2 0x1974e447e WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) 3 0x197b33a57 WebCore::EventTarget::innerInvokeEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener, WTF::DumbPtrTraits<WebCore::RegisteredEventListener> >, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::EventTarget::EventInvokePhase) 4 0x197b2fd60 WebCore::EventTarget::fireEventListeners(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) 5 0x197b3354d WebCore::EventTarget::dispatchEvent(WebCore::Event&) 6 0x1996c5b2f WebCore::WorkerMessagingProxy::postMessageToWorkerGlobalScope(WebCore::MessageWithMessagePorts&&)::$_5::operator()(WebCore::ScriptExecutionContext&) 7 0x1996c58f3 WTF::Detail::CallableWrapper<WebCore::WorkerMessagingProxy::postMessageToWorkerGlobalScope(WebCore::MessageWithMessagePorts&&)::$_5, void, WebCore::ScriptExecutionContext&>::call(WebCore::ScriptExecutionContext&) 8 0x19735f44a WTF::Function<void (WebCore::ScriptExecutionContext&)>::operator()(WebCore::ScriptExecutionContext&) const 9 0x19734abdd WebCore::ScriptExecutionContext::Task::performTask(WebCore::ScriptExecutionContext&) 10 0x1996ba5e0 WebCore::WorkerRunLoop::Task::performTask(WebCore::WorkerGlobalScope*) 11 0x1996b9ad7 WebCore::WorkerRunLoop::runInMode(WebCore::WorkerGlobalScope*, WebCore::ModePredicate const&, WebCore::WorkerRunLoop::WaitMode) 12 0x1996b96d8 WebCore::WorkerRunLoop::run(WebCore::WorkerGlobalScope*) 13 0x1996bd518 WebCore::WorkerThread::runEventLoop() 14 0x19969e634 WebCore::DedicatedWorkerThread::runEventLoop() 15 0x1996bcfe1 WebCore::WorkerThread::workerThread() 16 0x1996d0118 WebCore::WorkerThread::start(WTF::Function<void (WTF::String const&)>&&)::$_16::operator()() const 17 0x1996d00ce WTF::Detail::CallableWrapper<WebCore::WorkerThread::start(WTF::Function<void (WTF::String const&)>&&)::$_16, void>::call() 18 0x1b06e5792 WTF::Function<void ()>::operator()() const 19 0x1b078be58 WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) 20 0x1b0797588 WTF::wtfThreadEntryPoint(void*) 21 0x7fff6bc80109 _pthread_start 22 0x7fff6bc7bb8b thread_start SHOULD NEVER BE REACHED ./bindings/ScriptValue.cpp(45) : RefPtr<JSON::Value> Inspector::jsToInspectorValue(JSC::JSGlobalObject *, JSC::JSValue, int) 1 0x1b06be9e9 WTFCrash 2 0x1b0e031bb WTFCrashWithInfo(int, char const*, char const*, int) 3 0x1b100b193 Inspector::jsToInspectorValue(JSC::JSGlobalObject*, JSC::JSValue, int) 4 0x1b100b0f9 Inspector::toInspectorValue(JSC::JSGlobalObject*, JSC::JSValue) 5 0x1b184c920 Inspector::InjectedScriptBase::makeCall(Deprecated::ScriptFunctionCall&) 6 0x1b184ee10 Inspector::InjectedScript::clearEventValue() 7 0x1b185160a Inspector::InjectedScriptManager::clearEventValue() 8 0x1982df1f9 WebCore::InspectorDOMDebuggerAgent::didHandleEvent() 9 0x198218e41 WebCore::InspectorInstrumentation::didHandleEventImpl(WebCore::InstrumentingAgents&) 10 0x197b33f9a WebCore::InspectorInstrumentation::didHandleEvent(WebCore::ScriptExecutionContext&) 11 0x197b33a60 WebCore::EventTarget::innerInvokeEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener, WTF::DumbPtrTraits<WebCore::RegisteredEventListener> >, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, WebCore::EventTarget::EventInvokePhase) 12 0x197b2fd60 WebCore::EventTarget::fireEventListeners(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) 13 0x197b3354d WebCore::EventTarget::dispatchEvent(WebCore::Event&) 14 0x1996c5b2f WebCore::WorkerMessagingProxy::postMessageToWorkerGlobalScope(WebCore::MessageWithMessagePorts&&)::$_5::operator()(WebCore::ScriptExecutionContext&) 15 0x1996c58f3 WTF::Detail::CallableWrapper<WebCore::WorkerMessagingProxy::postMessageToWorkerGlobalScope(WebCore::MessageWithMessagePorts&&)::$_5, void, WebCore::ScriptExecutionContext&>::call(WebCore::ScriptExecutionContext&) 16 0x19735f44a WTF::Function<void (WebCore::ScriptExecutionContext&)>::operator()(WebCore::ScriptExecutionContext&) const 17 0x19734abdd WebCore::ScriptExecutionContext::Task::performTask(WebCore::ScriptExecutionContext&) 18 0x1996ba5e0 WebCore::WorkerRunLoop::Task::performTask(WebCore::WorkerGlobalScope*) 19 0x1996b9ad7 WebCore::WorkerRunLoop::runInMode(WebCore::WorkerGlobalScope*, WebCore::ModePredicate const&, WebCore::WorkerRunLoop::WaitMode) 20 0x1996b96d8 WebCore::WorkerRunLoop::run(WebCore::WorkerGlobalScope*) 21 0x1996bd518 WebCore::WorkerThread::runEventLoop() 22 0x19969e634 WebCore::DedicatedWorkerThread::runEventLoop() 23 0x1996bcfe1 WebCore::WorkerThread::workerThread() 24 0x1996d0118 WebCore::WorkerThread::start(WTF::Function<void (WTF::String const&)>&&)::$_16::operator()() const 25 0x1996d00ce WTF::Detail::CallableWrapper<WebCore::WorkerThread::start(WTF::Function<void (WTF::String const&)>&&)::$_16, void>::call() 26 0x1b06e5792 WTF::Function<void ()>::operator()() const 27 0x1b078be58 WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) 28 0x1b0797588 WTF::wtfThreadEntryPoint(void*) 29 0x7fff6bc80109 _pthread_start 30 0x7fff6bc7bb8b thread_start

Created attachment 398069 [details] Patch I managed to create a valid LayoutTest for this, and with that it showed that the attempted fix in attachment 397995 [details] was not valid, as it's possible for the event to already be dispatched by the time that `m_isTerminatingExecution` is set. As such, I've added logic to the Web Inspector `InjectedScript` (and various manager classes) to handle `TerminatedExecutionError` instead.

Comment on attachment 398069 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=398069&action=review > Source/WebInspectorUI/ChangeLog:13 > + Be sure to update the active execution context display even if the removed execution context > + was not the active execution context. Can you add a bit more comment about why this should be done?

Comment on attachment 398069 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=398069&action=review >> Source/WebInspectorUI/ChangeLog:13 >> + was not the active execution context. > > Can you add a bit more comment about why this should be done? This relates to the execution context picker at the end of the console prompt. If a Worker is removed and is NOT the active execution context, we should hide the execution context picker if there is only one other execution context (e.g. the main page). Previously, we would only hide the picker if the Worker was the active execution context.

Comment on attachment 398069 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=398069&action=review r=me with a question >> Source/WebInspectorUI/ChangeLog:13 >> + was not the active execution context. > > Can you add a bit more comment about why this should be done? I had the same question. Devin said on Slack that this is needed to hide the drop-down picker if, after a worker terminates, there are no longer any additional contexts besides the main frame. > Source/JavaScriptCore/inspector/InjectedScriptBase.cpp:-86 > - return JSON::Value::create("Exception while making a call."); Yay, glad we no longer drop the error message on the floor.

(In reply to Brian Burg from comment #11) > Comment on attachment 398069 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=398069&action=review > > r=me with a question [- with a question]

Created attachment 398087 [details] Patch

Committed r260963: <https://trac.webkit.org/changeset/260963> All reviewed patches have been landed. Closing bug and clearing flags on attachment 398087 [details].