112926 2013-03-21 09:57:02 -0700 Web Inspector: Page crash if ScriptPreprocessor returns 0 bytes 2014-08-03 18:46:19 -0700 1 1 1 Unclassified WebKit Web Inspector (Deprecated) 528+ (Nightly build) All All RESOLVED INVALID P2 Normal --- 0 johnjbarton webkit-unassigned apavlov burg keishi loislo pfeldman pmuellr vsevik web-inspector-bugs yurys oldest_to_newest 860433 0 johnjbarton 2013-03-21 09:57:02 -0700 See also bug 111889 Bug 80992 and Bug 104384 When I apply the script preprocessor twice, the second time the page crashes (sad face page). In a debug build I see: ... injectedScript._commandLineAPIImpl = new CommandLineAPIImpl(); return injectedScript; }) ../../third_party/WebKit/Source/WebCore/bindings/v8/ScriptDebugServer.cpp(158) : WTF::String WebCore::ScriptDebugServer::ScriptPreprocessor::preprocessSourceCode(const WTF::String&, const WTF::String&, WebCore::DOMWindow*) ERROR: Resulted in 0 bytes: ../../third_party/WebKit/Source/WebCore/bindings/v8/ScriptDebugServer.cpp(159) : WTF::String WebCore::ScriptDebugServer::ScriptPreprocessor::preprocessSourceCode(const WTF::String&, const WTF::String&, WebCore::DOMWindow*) ERROR: dispatchDidParseSource: ../../third_party/WebKit/Source/WebCore/bindings/v8/ScriptDebugServer.cpp(557) : void WebCore::ScriptDebugServer::dispatchDidParseSource(WebCore::ScriptDebugListener*, v8::Handle<v8::Object>) ASSERTION FAILED: v->IsFunction() ../../third_party/WebKit/Source/WebCore/bindings/v8/custom/V8InjectedScriptManager.cpp(103) : WebCore::ScriptObject WebCore::InjectedScriptManager::createInjectedScript(const WTF::String&, WebCore::ScriptState*, int) The truncated output and the next two messages are my debugging output, indicating that just before the crash we preprocessed a script and the result has zero bytes then hit an assert in V8InjectedScriptManager.cpp So I guess that the injected script from the reload is being preprocessed with the preprocessor from the previous reload, that preprocessor is failing to return a string, and the assert is hitting before the error from the failure of the preprocessor lands in the Inspector. 860462 1 johnjbarton 2013-03-21 10:53:37 -0700 The crash occurs during Console_enable(). [0x7f30547603e8] base::debug::StackTrace::StackTrace() [0x7f305475fcef] base::debug::(anonymous namespace)::StackDumpSignalHandler() [0x7f304ebf1cb0] <unknown> [0x7f3055cfddab] WebCore::InjectedScriptManager::createInjectedScript() [0x7f3055c95a08] WebCore::InjectedScriptManager::injectedScriptFor() [0x7f3055d09dba] WebCore::ConsoleMessage::addToFrontend() [0x7f3055cbcbd6] WebCore::InspectorConsoleAgent::enable() [0x7f30567cb776] WebCore::InspectorBackendDispatcherImpl::Console_enable() [0x7f30567f056f] WebCore::InspectorBackendDispatcherImpl::dispatch() [0x7f305584a114] WebCore::InspectorController::dispatchMessageFromFrontend() [0x7f305445262e] WebKit::WebDevToolsAgentImpl::dispatchOnInspectorBackend() [0x7f3056b87783] content::DevToolsAgent::OnDispatchOnInspectorBackend() [0x7f3056b88212] DispatchToMethod<>() [0x7f3056b87e14] DevToolsAgentMsg_DispatchOnInspectorBackend::Dispatch<>() [0x7f3056b8705c] content::DevToolsAgent::OnMessageReceived() 860720 2 194346 johnjbarton 2013-03-21 14:44:51 -0700 Created attachment 194346 Workaround and idea for fix 860732 3 johnjbarton 2013-03-21 14:47:47 -0700 As a workaround we can just return the input source if the output has no content. But a better solution is to detect that the script is 'injected-script' and not invoke the preprocessor. And bonus points if we can also detect console command evaluations. Any hints on how to achieve this? I took a stab at it but the data I expected was not associated with the eventData (see patch). 860935 4 johnjbarton 2013-03-21 17:41:34 -0700 Actually I'm mixing things up here. The zero bytes returned from the preprocessing step should result in an exception against the preprocessor, whether or not the input was injected scripts. If in fact the preprocessor wants to transcode a particular script to a no-op it can return a comment string. Even if the preprocessor is working correctly -- in fact especially if it is -- we need to avoid preprocessing all system JS, anything other than normal web page content. This belongs in a different Bug. 861742 5 johnjbarton 2013-03-22 12:09:00 -0700 I found another crash, so I changing the summary of this one. 194346 2013-03-21 14:44:51 -0700 2013-03-21 14:44:51 -0700 Workaround and idea for fix bug-112926-20130321144039.patch text/plain 8048 johnjbarton U3VidmVyc2lvbiBSZXZpc2lvbjogMTQ2MDcyCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNTczOTg5Njk2ZGI1NWQ3 NmYxNWZhNjFjZDMzODRiNTllN2U0MTA2Yi4uNzllOTBmMTY3MzFhNDkwZWE0YTk5YzY4MTVkM2Q5 NGZkZjNjMmI3ZiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwxOSArMSwxNSBAQAotMjAxMy0wMy0xOSAgSm9o biBKLiBCYXJ0b24gIDxqb2huamJhcnRvbkBjaHJvbWl1bS5vcmc+CisyMDEzLTAzLTIxICBKb2hu IEouIEJhcnRvbiAgPGpvaG5qYmFydG9uQGNocm9taXVtLm9yZz4KIAotICAgICAgICBXZWIgSW5z cGVjdG9yOiBFcnJvciBoYW5kbGluZyBmb3IgU2NyaXB0UHJlcHJvY2Vzc29yCi0gICAgICAgIGh0 dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0xMTE4ODkKKyAgICAgICAgV2Vi 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