Bug 202868 – Web Inspector: Unsafe to ref/deref from different threads in InspectorHeapAgent::didGarbageCollect

• Component: Web Inspector
• Status: NEW

[Yury Semikhatsky]

ASSERTION FAILED: Unsafe to ref/deref from different threads
m_isOwnedByMainThread == isMainThread()
/Users/yurys/WebKit/WebKitBuild/Debug/usr/local/include/wtf/RefCounted.h(115) : void WTF::RefCountedBase::applyRefDerefThreadingCheck() const
1   0x107e117f9 WTFCrash
2   0x11a85b7da WTF::RefCountedBase::applyRefDerefThreadingCheck() const
3   0x11a86ded9 WTF::RefCountedBase::ref() const
4   0x11d91b867 WTF::Ref<WTF::Stopwatch, WTF::DumbPtrTraits<WTF::Stopwatch> >::Ref(WTF::Stopwatch&)
5   0x11d91b82d WTF::Ref<WTF::Stopwatch, WTF::DumbPtrTraits<WTF::Stopwatch> >::Ref(WTF::Stopwatch&)
6   0x11d90928f WTF::Ref<WTF::Stopwatch, WTF::DumbPtrTraits<WTF::Stopwatch> >::copyRef() const &
7   0x11d909260 WebCore::InspectorController::executionStopwatch()
8   0x10903fbfc Inspector::InspectorHeapAgent::didGarbageCollect(JSC::CollectionScope)
9   0x108ec14ef JSC::Heap::didFinishCollection()
10  0x108ebf948 JSC::Heap::runEndPhase(JSC::GCConductor)
11  0x108ebe020 JSC::Heap::runCurrentPhase(JSC::GCConductor, JSC::CurrentThreadState*)
12  0x108ebde26 JSC::Heap::collectInCollectorThread()
13  0x108ec9039 JSC::Heap::HeapThread::work()
14  0x107e29d59 WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0::operator()() const
15  0x107e29949 WTF::Detail::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0, void>::call()
16  0x107e3e10a WTF::Function<void ()>::operator()() const
17  0x107ee9920 WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*)
18  0x107ef56d5 WTF::wtfThreadEntryPoint(void*)
19  0x7fff7ecc72eb _pthread_body
20  0x7fff7ecca249 _pthread_start
21  0x7fff7ecc640d thread_start


This happens every once in a while on WK1 Mac Debug when running inspector/timeline/timeline-recording.html

[Radar WebKit Bug Importer]

<rdar://problem/143148819>