Bug 68006 – Web Inspector: [JSC] Crashes opening closure

• Component: Web Inspector (Deprecated)
• Status: RESOLVED WORKSFORME

This is with Safari 5.1 (7534.50) on Windows 7.

* Open http://www.apple.com/startpage/
* Open Web Inspector by clicking Develop->Start Debugging JavaScript
* Click the "Pause Script Execution" button
* In the "Scope Variables" panel click on "Closure"
* It crashes with the below call stack.

This seems a 100% for me and happens on other pages.

>	JavaScriptCore.dll!JSC::JSCell::operator new(unsigned int size=56)  Line 419	C++
 	JavaScriptCore.dll!JSC::JSActivation::argumentsGetter(JSC::ExecState * __formal=0x070205c8, JSC::JSValue slotBase={...}, JSC::ExecState * __formal=0x070205c8)  Line 223	C++
 	JavaScriptCore.dll!cti_op_get_by_val(void * * args=0x00000000) 	C++
 	02a51d98()	
 	WebKit.dll!WebCore::InspectorBackendDispatcher::dispatch(const WTF::String & message={...})  Line 4301	C++
 	WebKit.dll!WebCore::InspectorFrontendClientLocal::sendMessageToBackend(const WTF::String & message={...})  Line 167	C++
 	WebKit.dll!WebCore::jsInspectorFrontendHostPrototypeFunctionSendMessageToBackend(JSC::ExecState * exec=0x00000000)  Line 478	C++
 	038c0531()	
 	JavaScriptCore.dll!ctiTrampoline(void * code=0x5e3b466f, JSC::RegisterFile * __formal=0x7eebc4cc, JSC::RegisterFile * __formal=0x7eebc4cc, JSC::RegisterFile * __formal=0x7eebc4cc, JSC::RegisterFile * __formal=0x7eebc4cc, JSC::RegisterFile * __formal=0x7eebc4cc)  Line 267	C++
 	070201e8()	
 	JavaScriptCore.dll!cti_op_put_by_id(void * * args=0x00000000)  Line 1441	C++
 	WebKit.dll!WebCore::JSMainThreadExecState::call(JSC::ExecState * exec=0x00000000, JSC::JSValue functionObject={...}, JSC::CallType callType=CallTypeJS, const JSC::CallData & callData={...}, JSC::JSValue thisValue={...}, const JSC::ArgList & args={...})  Line 48	C++
 	WebKit.dll!WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext * scriptExecutionContext=0x7e772988, WebCore::Event * event=0x7e8bb7e0)  Line 128	C++
 	WebKit.dll!WebCore::EventTarget::fireEventListeners(WebCore::Event * event=0x00000000, WebCore::EventTargetData * d=0x7e49c6f0, WTF::Vector<WebCore::RegisteredEventListener,1> & entry={...})  Line 360	C++
 	WebKit.dll!WebCore::EventTarget::fireEventListeners(WebCore::Event * event=)  Line 331	C++
 	WebKit.dll!WebCore::Node::handleLocalEvents(WebCore::Event * event=0x7e8bb7e0)  Line 2830	C++
 	WebKit.dll!WebCore::EventDispatcher::dispatchEvent(WTF::PassRefPtr<WebCore::Event> event={...})  Line 307	C++
 	WebKit.dll!WebCore::MouseEventDispatchMediator::dispatchEvent(WebCore::EventDispatcher * dispatcher=0x003eedec)  Line 177	C++
 	WebKit.dll!WebCore::Node::dispatchMouseEvent(const WebCore::PlatformMouseEvent & event={...}, const WTF::AtomicString & eventType={...}, int detail=1, WebCore::Node * relatedTarget=0x00000000)  Line 2878	C++
 	WebKit.dll!WebCore::EventHandler::dispatchMouseEvent(const WTF::AtomicString & eventType={...}, WebCore::Node * targetNode=0x7de6ba80, bool __formal=true, int clickCount=1, const WebCore::PlatformMouseEvent & mouseEvent={...}, bool setUnder=true)  Line 2011	C++
 	WebKit.dll!WebCore::EventHandler::handleMouseReleaseEvent(const WebCore::PlatformMouseEvent & mouseEvent=)  Line 1713	C++
 	WebKit.dll!WebKit::handleMouseEvent(const WebKit::WebMouseEvent & mouseEvent={...}, WebCore::Page * page=0x7e4a6180)  Line 1042	C++
 	WebKit.dll!WebKit::WebPage::mouseEvent(const WebKit::WebMouseEvent & mouseEvent=)  Line 1062	C++
 	WebKit.dll!CoreIPC::handleMessage<Messages::WebPage::MouseEvent,WebKit::WebPage,void (__thiscall WebKit::WebPage::*)(WebKit::WebMouseEvent const &)>(CoreIPC::ArgumentDecoder * argumentDecoder=0x7dcf6fa0, WebKit::WebPage * object=0x7ec92480, void (const WebKit::WebMouseEvent &)* function=0x5c7c8080)  Line 278	C++
 	WebKit.dll!WebKit::WebPage::didReceiveWebPageMessage(CoreIPC::Connection * __formal=0x5c7caf14, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x00000000)  Line 88	C++
 	WebKit.dll!WebKit::WebPage::didReceiveMessage(CoreIPC::Connection * connection=0x00000000, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x7dcf6fa0)  Line 2018	C++
 	WebKit.dll!WebKit::WebProcess::didReceiveMessage(CoreIPC::Connection * connection=0x7ee92c00, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x7dcf6fa0)  Line 643	C++
 	WebKit.dll!CoreIPC::Connection::dispatchMessage(CoreIPC::Connection::Message<CoreIPC::ArgumentDecoder> & message={...})  Line 689	C++
 	WebKit.dll!CoreIPC::Connection::dispatchMessages()  Line 714	C++
 	JavaScriptCore.dll!WTF::Mutex::unlock()  Line 324	C++
 	WebKit.dll!RunLoop::performWork()  Line 64	C++
 	WebKit.dll!RunLoop::wndProc(HWND__ * hWnd=, unsigned int message=0, unsigned int wParam=0, long lParam=)  Line 65	C++
 	WebKit.dll!RunLoop::RunLoopWndProc(HWND__ * hWnd=0x000a0f42, unsigned int message=1025, unsigned int wParam=2129229760, long lParam=0)  Line 55	C++

[Matthew Ellis]

I'm seeing this same issue on a custom port of webkit. I have also been able to reproduce it on Safari 5.1 on MacOS Snow Leopard. 

Does anyone have any ideas on what might be causing this?

I though they fixed it but Safari 5.1.7 (7534.57.2) still crashes as described originally.

[Geoffrey Garen]

<rdar://problem/11958788>

[Matthew Ellis]

I believe this issue is related to: 
https://bugs.webkit.org/show_bug.cgi?id=87192

[Brian Burg]

Please re-file or reopen if this is still an issue.