[Webkit-unassigned] [Bug 156737] Calling then on promise in Workers may crash in Debug builds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=156737

--- Comment #4 from youenn fablet <youennf at gmail.com> ---
I am not able to reproduce this error anymore.
Related to promises and Workers, I am sometimes hitting the following assertion:

  6 ASSERTION FAILED: promise.inherits(JSPromise::info())
  7 /Users/youenn/Apple/Safari/OpenSource/Source/JavaScriptCore/runtime/JSPromiseDeferred.cpp(63) : static JSC::JSPromiseDeferred *JSC::JSPromiseDeferred::create(JSC::ExecState *, JSC::JSGlobalObject *)
  8 1   0x109dd01ad WTFCrash
  9 2   0x10992b97e JSC::JSPromiseDeferred::create(JSC::ExecState*, JSC::JSGlobalObject*)
 10 3   0x10d19bf95 WebCore::callPromiseFunction(JSC::ExecState&, long long (*)(JSC::ExecState*, JSC::JSPromiseDeferred*))
 11 4   0x10d87f0bc WebCore::jsWorkerGlobalScopePrototypeFunctionFetchRequest(JSC::ExecState*)
 12 5   0x5be8827ae8c8
 13 6   0x5be8828a28e7
 14 7   0x1099f334b llint_entry
 15 8   0x5be8828968b3
 16 9   0x1099ec2ce vmEntryToJavaScript
 17 10  0x1097df7d7 JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*)
 18 11  0x109766d37 JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&)
 19 12  0x109022838 JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&)
 20 13  0x109022a1b JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&)
 21 14  0x1098ce40b JSC::JSJobMicrotask::run(JSC::ExecState*)
 22 15  0x10d2aba77 WebCore::JSGlobalObjectCallback::call()
 23 16  0x10d2ab931 WebCore::JSGlobalObjectTask::JSGlobalObjectTask(WebCore::JSDOMGlobalObject*, WTF::Ref<JSC::Microtask>&&)::$_0::operator()(WebCore::ScriptExecutionContext&) const
 24 17  0x10d2ab7d4 WTF::Function<void (WebCore::ScriptExecutionContext&)>::CallableWrapper<WebCore::JSGlobalObjectTask::JSGlobalObjectTask(WebCore::JSDOMGlobalObject*, WTF::Ref<JSC::Microtask>&&)::$_0>::call(WebCore::ScriptExecutionContext&)
 25 18  0x10c87b551 WTF::Function<void (WebCore::ScriptExecutionContext&)>::operator()(WebCore::ScriptExecutionContext&) const
 26 19  0x10c8669fd WebCore::ScriptExecutionContext::Task::performTask(WebCore::ScriptExecutionContext&)
 27 20  0x10e7e0619 WebCore::WorkerRunLoop::Task::performTask(WebCore::WorkerRunLoop const&, WebCore::WorkerGlobalScope*)
 28 21  0x10e7df78b WebCore::WorkerRunLoop::runInMode(WebCore::WorkerGlobalScope*, WebCore::ModePredicate const&, WebCore::WorkerRunLoop::WaitMode)
 29 22  0x10e7df2f6 WebCore::WorkerRunLoop::run(WebCore::WorkerGlobalScope*)
 30 23  0x10e7e7930 WebCore::WorkerThread::runEventLoop()
 31 24  0x10c7d82a8 WebCore::DedicatedWorkerThread::runEventLoop()
 32 25  0x10e7e774d WebCore::WorkerThread::workerThread()
 33 26  0x10e7e72f5 WebCore::WorkerThread::workerThreadStart(void*)
 34 27  0x109e397e9 WTF::createThread(void (*)(void*), void*, char const*)::$_0::operator()() const
 35 28  0x109e397bd void std::__1::__invoke_void_return_wrapper<void>::__call<WTF::createThread(void (*)(void*), void*, char const*)::$_0&>(WTF::createThread(void (*)(void*), void*, char const*)::$_0&&&)
 36 29  0x109e39769 std::__1::__function::__func<WTF::createThread(void (*)(void*), void*, char const*)::$_0, std::__1::allocator<WTF::createThread(void (*)(void*), void*, char const*)::$_0>, void ()>::operator()()
 37 30  0x109448faa std::__1::function<void ()>::operator()() const
 38 31  0x109e38407 WTF::threadEntryPoint(void*)
 39 LEAK: 1 WebProcessPool
 40 LEAK: 1 WebPageProxy

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