[Qtwebengine] Websockets not working -> debug Javascript?

[Fabian Bernhard]

Hoi Jocelyn,

Thanks for your report, I am glad that it works generally speaking.

WebSockets seem to work for me (on Linux) with this test page:
> http://www.websocket.org/echo.html


It doesn't work for me though. I am using the "examples/widgets/browser"
project for testing. The website just hangs and does not finish loading.


> For debugging in general, make sure that you start your application with
> --single-process.
> It will run the render and plugin processes as thread in the main process
> instead and should allow you to debug more easily.
>

With this flag the browser crashes consistently when I load above
websocket.org website, see crash log below. Google.com works fine though.

May be its just an OSX issue?

Thanks for your assistance!

Fabian


Thread 18 Crashed:: Chrome_InProcRendererThread
0   libQt5WebEngineCore.dylib     0x00000001032f7b38
WebCore::V8HTMLElement::createWrapper(WTF::PassRefPtr<WebCore::HTMLElement>,
v8::Handle<v8::Object>, v8::Isolate*) + 232
1   libQt5WebEngineCore.dylib     0x000000010343fa8c
WebCore::createHTMLVideoElementWrapper(WebCore::HTMLElement*,
v8::Handle<v8::Object>, v8::Isolate*) + 140
2   libQt5WebEngineCore.dylib     0x000000010343e27f
WebCore::createV8HTMLWrapper(WebCore::HTMLElement*, v8::Handle<v8::Object>,
v8::Isolate*) + 12863
3   libQt5WebEngineCore.dylib     0x0000000103413d92
WebCore::wrap(WebCore::Element*, v8::Handle<v8::Object>, v8::Isolate*) + 18
4   libQt5WebEngineCore.dylib     0x0000000103337087
WebCore::DocumentV8Internal::createElementMethodCallbackForMainWorld(v8::FunctionCallbackInfo<v8::Value>
const&) + 951
5   libQt5WebEngineCore.dylib     0x000000010239d5de
v8::internal::FunctionCallbackArguments::Call(void
(*)(v8::FunctionCallbackInfo<v8::Value> const&)) + 158
6   libQt5WebEngineCore.dylib     0x00000001023b6d69
v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**,
v8::internal::Isolate*) + 393
7   ???                           0x00003906113069ce 0 + 62698220972494
8   ???                           0x0000390611357598 0 + 62698221303192
9   ???                           0x0000390611344d18 0 + 62698221227288
10  ???                           0x0000390611311394 0 + 62698221015956
11  ???                           0x0000390611342aa9 0 + 62698221218473
12  ???                           0x0000390611336a24 0 + 62698221169188
13  ???                           0x000039061131a477 0 + 62698221053047
14  libQt5WebEngineCore.dylib     0x00000001023edfb6
v8::internal::Invoke(bool, v8::internal::Handle<v8::internal::JSFunction>,
v8::internal::Handle<v8::internal::Object>, int,
v8::internal::Handle<v8::internal::Object>*, bool*) + 342
15  libQt5WebEngineCore.dylib     0x00000001023849a6 v8::Script::Run() + 486
16  libQt5WebEngineCore.dylib     0x0000000103405c9f
WebCore::V8ScriptRunner::runCompiledScript(v8::Handle<v8::Script>,
WebCore::ScriptExecutionContext*, v8::Isolate*) + 271
17  libQt5WebEngineCore.dylib     0x00000001033df276
WebCore::ScriptController::compileAndRunScript(WebCore::ScriptSourceCode
const&, WebCore::AccessControlStatus) + 518
18  libQt5WebEngineCore.dylib     0x00000001033e08b2
WebCore::ScriptController::executeScriptInMainWorld(WebCore::ScriptSourceCode
const&, WebCore::AccessControlStatus) + 418
19  libQt5WebEngineCore.dylib     0x00000001027ec8dc
WebCore::ScriptLoader::executeScript(WebCore::ScriptSourceCode const&) + 716
20  libQt5WebEngineCore.dylib     0x00000001029f1a9a
WebCore::HTMLScriptRunner::executePendingScriptAndDispatchEvent(WebCore::PendingScript&)
+ 234
21  libQt5WebEngineCore.dylib     0x00000001029f2202
WebCore::HTMLScriptRunner::executeParsingBlockingScripts() + 386
22  libQt5WebEngineCore.dylib     0x00000001029e64e0
WebCore::HTMLDocumentParser::notifyFinished(WebCore::Resource*) + 80
23  libQt5WebEngineCore.dylib     0x0000000102cd5d48
WebCore::Resource::checkNotify() + 344
24  libQt5WebEngineCore.dylib     0x0000000102cd605a
WebCore::Resource::finish(double) + 26
25  libQt5WebEngineCore.dylib     0x0000000102ce207b
WebCore::ResourceLoader::didFinishLoading(WebKit::WebURLLoader*, double) +
123
26  libQt5WebEngineCore.dylib     0x00000001037460cf
webkit_glue::WebURLLoaderImpl::Context::OnCompletedRequest(int, bool,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&, base::TimeTicks const&) + 479
27  libQt5WebEngineCore.dylib     0x000000010372c071
content::ResourceDispatcher::OnRequestComplete(int, int, bool,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&, base::TimeTicks const&) + 449
28  libQt5WebEngineCore.dylib     0x000000010372aaf1
content::ResourceDispatcher::DispatchMessage(IPC::Message const&) + 561
29  libQt5WebEngineCore.dylib     0x000000010372a2db
content::ResourceDispatcher::OnMessageReceived(IPC::Message const&) + 811
30  libQt5WebEngineCore.dylib     0x00000001036ee9d6
content::ChildThread::OnMessageReceived(IPC::Message const&) + 38
31  libQt5WebEngineCore.dylib     0x00000001018b545f
IPC::ChannelProxy::Context::OnDispatchMessage(IPC::Message const&) + 575
32  libQt5WebEngineCore.dylib     0x000000010187ceda
base::MessageLoop::RunTask(base::PendingTask const&) + 1082
33  libQt5WebEngineCore.dylib     0x000000010187d407
base::MessageLoop::DoWork() + 727
34  libQt5WebEngineCore.dylib     0x000000010187fcea
base::MessagePumpDefault::Run(base::MessagePump::Delegate*) + 346
35  libQt5WebEngineCore.dylib     0x000000010187c7c2
base::MessageLoop::RunInternal() + 226
36  libQt5WebEngineCore.dylib     0x000000010189173a base::RunLoop::Run() +
26
37  libQt5WebEngineCore.dylib     0x000000010187bf9d
base::MessageLoop::Run() + 29
38  libQt5WebEngineCore.dylib     0x00000001018a7b4b
base::Thread::ThreadMain() + 203
39  libQt5WebEngineCore.dylib     0x00000001018a249b base::(anonymous
namespace)::ThreadFunc(void*) + 171
40  libsystem_pthread.dylib       0x00007fff92937899 _pthread_body + 138
41  libsystem_pthread.dylib       0x00007fff9293772a _pthread_start + 137
42  libsystem_pthread.dylib       0x00007fff9293bfc9 thread_start + 13
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