[Webkit-unassigned] [Bug 229014] New: ThreadSanitizer: data race in WebCore::CARingBufferStorageVector::setCurrentFrameBounds() / getCurrentFrameBounds()

Wed Aug 11 15:47:40 PDT 2021

https://bugs.webkit.org/show_bug.cgi?id=229014

            Bug ID: 229014
           Summary: ThreadSanitizer: data race in
                    WebCore::CARingBufferStorageVector::setCurrentFrameBou
                    nds() / getCurrentFrameBounds()
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ddkilzer at webkit.org
                CC: cdumez at apple.com, eric.carlson at apple.com

ThreadSanitizer: data race in WebCore::CARingBufferStorageVector::setCurrentFrameBounds() / getCurrentFrameBounds().

The issue is that setCurrentFrameBounds() uses a Locker, but getCurrentFrameBounds().

Both currentStartFrame() and currentEndFrame() are also missing a Locker.  I did not catch explicit races there, but they exist based on source code inspection.

WARNING: ThreadSanitizer: data race (pid=55586)
  Write of size 8 at 0x7b58000622f8 by thread T17:
    #0 WebCore::CARingBufferStorageVector::setCurrentFrameBounds(unsigned long long, unsigned long long) <null> (WebCore:x86_64+0x2f166ca)
    #1 WebCore::CARingBuffer::setCurrentFrameBounds(unsigned long long, unsigned long long) <null> (WebCore:x86_64+0x2f1641d)
    #2 WebCore::CARingBuffer::store(AudioBufferList const*, unsigned long, unsigned long long) <null> (WebCore:x86_64+0x2f16386)
    #3 WebCore::AudioSampleDataSource::pushSamplesInternal(AudioBufferList const&, WTF::MediaTime const&, unsigned long) <null> (WebCore:x86_64+0x1151119)
    #4 WebCore::AudioSampleDataSource::pushSamples(WTF::MediaTime const&, WebCore::PlatformAudioData const&, unsigned long) <null> (WebCore:x86_64+0x11513d0)
    #5 WebCore::WebAudioSourceProviderCocoa::receivedNewAudioSamples(WebCore::PlatformAudioData const&, WebCore::AudioStreamDescription const&, unsigned long) <null> (WebCore:x86_64+0x16f17b1)
    #6 WebCore::MediaStreamTrackAudioSourceProviderCocoa::audioSamplesAvailable(WTF::MediaTime const&, WebCore::PlatformAudioData const&, WebCore::AudioStreamDescription const&, unsigned long) <null> (WebCore:x86_64+0x32b7d85)
    #7 non-virtual thunk to WebCore::MediaStreamTrackAudioSourceProviderCocoa::audioSamplesAvailable(WTF::MediaTime const&, WebCore::PlatformAudioData const&, WebCore::AudioStreamDescription const&, unsigned long) <null> (WebCore:x86_64+0x32b7dd7)
    #8 WebCore::RealtimeMediaSource::audioSamplesAvailable(WTF::MediaTime const&, WebCore::PlatformAudioData const&, WebCore::AudioStreamDescription const&, unsigned long) <null> (WebCore:x86_64+0x32581aa)
    #9 WebKit::RemoteRealtimeAudioSource::remoteAudioSamplesAvailable(WTF::MediaTime const&, WebCore::PlatformAudioData const&, WebCore::AudioStreamDescription const&, unsigned long) <null> (WebKit:x86_64+0x1c724a9)
    #10 WebKit::RemoteCaptureSampleManager::RemoteAudio::startThread()::$_3::operator()() <null> (WebKit:x86_64+0x1c8e38c)
    #11 WTF::Detail::CallableWrapper<WebKit::RemoteCaptureSampleManager::RemoteAudio::startThread()::$_3, void>::call() <null> (WebKit:x86_64+0x1c8e1ad)
    #12 WTF::Function<void ()>::operator()() const <null> (JavaScriptCore:x86_64+0x2620d)
    #13 WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) <null> (JavaScriptCore:x86_64+0xbccf0)
    #14 WTF::wtfThreadEntryPoint(void*) <null> (JavaScriptCore:x86_64+0xc5719)

  Previous read of size 8 at 0x7b58000622f8 by thread T16:
    #0 WebCore::CARingBufferStorageVector::getCurrentFrameBounds(unsigned long long&, unsigned long long&) <null> (WebCore:x86_64+0x2f168e7)
    #1 WebCore::CARingBuffer::getCurrentFrameBoundsWithoutUpdate(unsigned long long&, unsigned long long&) <null> (WebCore:x86_64+0x2f1688d)
    #2 WebCore::CARingBuffer::getCurrentFrameBounds(unsigned long long&, unsigned long long&) <null> (WebCore:x86_64+0x2f167f1)
    #3 WebCore::AudioSampleDataSource::pullSamplesInternal(AudioBufferList&, unsigned long, unsigned long long, double, WebCore::AudioSampleDataSource::PullMode) <null> (WebCore:x86_64+0x1151549)
    #4 WebCore::AudioSampleDataSource::pullSamples(AudioBufferList&, unsigned long, unsigned long long, double, WebCore::AudioSampleDataSource::PullMode) <null> (WebCore:x86_64+0x1151ef9)
    #5 WebCore::WebAudioSourceProviderCocoa::provideInput(WebCore::AudioBus*, unsigned long) <null> (WebCore:x86_64+0x16f0ff5)
    #6 WebCore::MediaStreamAudioSourceNode::provideInput(WebCore::AudioBus*, unsigned long) <null> (WebCore:x86_64+0x1949f03)
    #7 WebCore::MediaStreamAudioSourceNode::process(unsigned long) <null> (WebCore:x86_64+0x194a08d)
    #8 WebCore::AudioNode::processIfNecessary(unsigned long) <null> (WebCore:x86_64+0x18aa734)
    #9 WebCore::AudioNodeOutput::pull(WebCore::AudioBus*, unsigned long) <null> (WebCore:x86_64+0x18c9c92)
    #10 WebCore::AudioNodeInput::pull(WebCore::AudioBus*, unsigned long) <null> (WebCore:x86_64+0x18c9d35)
    #11 WebCore::AudioBasicInspectorNode::pullInputs(unsigned long) <null> (WebCore:x86_64+0x189e407)
    #12 WebCore::AudioNode::processIfNecessary(unsigned long) <null> (WebCore:x86_64+0x18aa660)
    #13 WebCore::AudioNodeOutput::pull(WebCore::AudioBus*, unsigned long) <null> (WebCore:x86_64+0x18c9c92)
    #14 WebCore::AudioNodeInput::pull(WebCore::AudioBus*, unsigned long) <null> (WebCore:x86_64+0x18c9d35)
    #15 WebCore::AudioNode::pullInputs(unsigned long) <null> (WebCore:x86_64+0x18aa984)
    #16 WebCore::AudioNode::processIfNecessary(unsigned long) <null> (WebCore:x86_64+0x18aa660)
    #17 WebCore::AudioNodeOutput::pull(WebCore::AudioBus*, unsigned long) <null> (WebCore:x86_64+0x18c9c92)
    #18 WebCore::AudioNodeInput::sumAllConnections(WebCore::AudioBus*, unsigned long) <null> (WebCore:x86_64+0x18c9b64)
    #19 WebCore::AudioNodeInput::pull(WebCore::AudioBus*, unsigned long) <null> (WebCore:x86_64+0x18c9d11)
    #20 WebCore::AudioDestinationNode::renderQuantum(WebCore::AudioBus*, unsigned long, WebCore::AudioIOPosition const&) <null> (WebCore:x86_64+0x18a6dee)
    #21 WebCore::DefaultAudioDestinationNode::render(WebCore::AudioBus*, WebCore::AudioBus*, unsigned long, WebCore::AudioIOPosition const&) <null> (WebCore:x86_64+0x19206f0)
    #22 non-virtual thunk to WebCore::DefaultAudioDestinationNode::render(WebCore::AudioBus*, WebCore::AudioBus*, unsigned long, WebCore::AudioIOPosition const&) <null> (WebCore:x86_64+0x19207c7)
    #23 WebCore::AudioDestination::callRenderCallback(WebCore::AudioBus*, WebCore::AudioBus*, unsigned long, WebCore::AudioIOPosition const&) <null> (WebCore:x86_64+0x2f04614)
    #24 WebCore::AudioDestinationCocoa::renderOnRenderingThead(unsigned long) <null> (WebCore:x86_64+0x2f0450e)
    #25 WebCore::AudioDestinationCocoa::renderOnRenderingTheadIfPlaying(unsigned long) <null> (WebCore:x86_64+0x2f0438d)
    #26 WebCore::AudioDestinationCocoa::render(double, unsigned long long, unsigned int, AudioBufferList*) <null> (WebCore:x86_64+0x2f041e2)
    #27 WebKit::RemoteAudioDestinationProxy::renderQuantum() <null> (WebKit:x86_64+0x1979fc1)
    #28 WebKit::RemoteAudioDestinationProxy::startRenderingThread()::$_10::operator()() <null> (WebKit:x86_64+0x19a14cb)
    #29 WTF::Detail::CallableWrapper<WebKit::RemoteAudioDestinationProxy::startRenderingThread()::$_10, void>::call() <null> (WebKit:x86_64+0x19a143d)
    #30 WTF::Function<void ()>::operator()() const <null> (JavaScriptCore:x86_64+0x2620d)
    #31 WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) <null> (JavaScriptCore:x86_64+0xbccf0)
    #32 WTF::wtfThreadEntryPoint(void*) <null> (JavaScriptCore:x86_64+0xc5719)

  Location is heap block of size 768 at 0x7b5800062100 allocated by thread T17:
    #0 __sanitizer_mz_malloc <null> (libclang_rt.tsan_osx_dynamic.dylib:x86_64+0x5168a)
    #1 _malloc_zone_malloc <null> (libsystem_malloc.dylib:x86_64+0x1cf80)
    #2 bmalloc::Cache::allocateSlowCaseNullCache(bmalloc::HeapKind, unsigned long) <null> (JavaScriptCore:x86_64+0x11d240)
    #3 bmalloc::Cache::allocate(bmalloc::HeapKind, unsigned long) <null> (JavaScriptCore:x86_64+0x37629)
    #4 WTF::fastMalloc(unsigned long) <null> (JavaScriptCore:x86_64+0x36e5b)
    #5 WTF::FastMalloc::malloc(unsigned long) <null> (WebCore:x86_64+0x1a059)
    #6 bool WTF::VectorBufferBase<WebCore::CARingBufferStorageVector::TimeBounds, WTF::FastMalloc>::allocateBuffer<(WTF::FailureAction)0>(unsigned long) <null> (WebCore:x86_64+0x2f1b4d1)
    #7 WTF::VectorBuffer<WebCore::CARingBufferStorageVector::TimeBounds, 0ul, WTF::FastMalloc>::VectorBuffer(unsigned long, unsigned long) <null> (WebCore:x86_64+0x2f1b3f0)
    #8 WTF::Vector<WebCore::CARingBufferStorageVector::TimeBounds, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>::Vector(unsigned long) <null> (WebCore:x86_64+0x2f1b363)
    #9 WTF::Vector<WebCore::CARingBufferStorageVector::TimeBounds, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>::Vector(unsigned long) <null> (WebCore:x86_64+0x2f154b0)
    #10 WebCore::CARingBufferStorageVector::CARingBufferStorageVector() <null> (WebCore:x86_64+0x2f15426)
    #11 WebCore::CARingBufferStorageVector::CARingBufferStorageVector() <null> (WebCore:x86_64+0x2f154d9)
    #12 WTF::UniqueRef<WebCore::CARingBufferStorageVector> WTF::makeUniqueRefWithoutFastMallocCheck<WebCore::CARingBufferStorageVector>() <null> (WebCore:x86_64+0x2f1b617)
    #13 WTF::UniqueRef<WebCore::CARingBufferStorageVector> WTF::makeUniqueRef<WebCore::CARingBufferStorageVector>() <null> (WebCore:x86_64+0x2f155a9)
    #14 WebCore::CARingBuffer::CARingBuffer() <null> (WebCore:x86_64+0x2f15512)
    #15 WebCore::CARingBuffer::CARingBuffer() <null> (WebCore:x86_64+0x2f15669)
    #16 WTF::UniqueRef<WebCore::CARingBuffer> WTF::makeUniqueRefWithoutFastMallocCheck<WebCore::CARingBuffer>() <null> (WebCore:x86_64+0x353f7)
    #17 WTF::UniqueRef<WebCore::CARingBuffer> WTF::makeUniqueRef<WebCore::CARingBuffer>() <null> (WebCore:x86_64+0x353a9)
    #18 WebCore::AudioSampleDataSource::AudioSampleDataSource(unsigned long, WTF::LoggerHelper&, unsigned long) <null> (WebCore:x86_64+0x11503aa)
    #19 WebCore::AudioSampleDataSource::AudioSampleDataSource(unsigned long, WTF::LoggerHelper&, unsigned long) <null> (WebCore:x86_64+0x1150280)
    #20 WebCore::AudioSampleDataSource::create(unsigned long, WTF::LoggerHelper&, unsigned long) <null> (WebCore:x86_64+0x11501c0)
    #21 WebCore::WebAudioSourceProviderCocoa::prepare(AudioStreamBasicDescription const&) <null> (WebCore:x86_64+0x16f12ac)
    #22 WebCore::WebAudioSourceProviderCocoa::receivedNewAudioSamples(WebCore::PlatformAudioData const&, WebCore::AudioStreamDescription const&, unsigned long) <null> (WebCore:x86_64+0x16f173b)
    #23 WebCore::MediaStreamTrackAudioSourceProviderCocoa::audioSamplesAvailable(WTF::MediaTime const&, WebCore::PlatformAudioData const&, WebCore::AudioStreamDescription const&, unsigned long) <null> (WebCore:x86_64+0x32b7d85)
    #24 non-virtual thunk to WebCore::MediaStreamTrackAudioSourceProviderCocoa::audioSamplesAvailable(WTF::MediaTime const&, WebCore::PlatformAudioData const&, WebCore::AudioStreamDescription const&, unsigned long) <null> (WebCore:x86_64+0x32b7dd7)
    #25 WebCore::RealtimeMediaSource::audioSamplesAvailable(WTF::MediaTime const&, WebCore::PlatformAudioData const&, WebCore::AudioStreamDescription const&, unsigned long) <null> (WebCore:x86_64+0x32581aa)
    #26 WebKit::RemoteRealtimeAudioSource::remoteAudioSamplesAvailable(WTF::MediaTime const&, WebCore::PlatformAudioData const&, WebCore::AudioStreamDescription const&, unsigned long) <null> (WebKit:x86_64+0x1c724a9)
    #27 WebKit::RemoteCaptureSampleManager::RemoteAudio::startThread()::$_3::operator()() <null> (WebKit:x86_64+0x1c8e38c)
    #28 WTF::Detail::CallableWrapper<WebKit::RemoteCaptureSampleManager::RemoteAudio::startThread()::$_3, void>::call() <null> (WebKit:x86_64+0x1c8e1ad)
    #29 WTF::Function<void ()>::operator()() const <null> (JavaScriptCore:x86_64+0x2620d)
    #30 WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) <null> (JavaScriptCore:x86_64+0xbccf0)
    #31 WTF::wtfThreadEntryPoint(void*) <null> (JavaScriptCore:x86_64+0xc5719)

  Thread T17 (tid=13416394, running) created by thread T5 at:
    #0 pthread_create <null> (libclang_rt.tsan_osx_dynamic.dylib:x86_64+0x2bffd)
    #1 WTF::Thread::establishHandle(WTF::Thread::NewThreadContext*, std::__1::optional<unsigned long>, WTF::Thread::QOS) <null> (JavaScriptCore:x86_64+0xc565e)
    #2 WTF::Thread::create(char const*, WTF::Function<void ()>&&, WTF::ThreadType, WTF::Thread::QOS) <null> (JavaScriptCore:x86_64+0xbcea7)
    #3 WebKit::RemoteCaptureSampleManager::RemoteAudio::startThread() <null> (WebKit:x86_64+0x1c718e8)
    #4 WebKit::RemoteCaptureSampleManager::RemoteAudio::setStorage(WebKit::SharedMemory::Handle const&, WebCore::CAAudioStreamDescription const&, unsigned long long, IPC::Semaphore&&, WTF::MediaTime const&, unsigned long) <null> (WebKit:x86_64+0x1c7125d)
    #5 WebKit::RemoteCaptureSampleManager::audioStorageChanged(WTF::ObjectIdentifier<WebCore::RealtimeMediaSourceIdentifierType>, WebKit::SharedMemory::IPCHandle const&, WebCore::CAAudioStreamDescription const&, unsigned long long, IPC::Semaphore&&, WTF::MediaTime const&, unsigned long) <null> (WebKit:x86_64+0x1c70f15)
    #6 void IPC::callMemberFunctionImpl<WebKit::RemoteCaptureSampleManager, void (WebKit::RemoteCaptureSampleManager::*)(WTF::ObjectIdentifier<WebCore::RealtimeMediaSourceIdentifierType>, WebKit::SharedMemory::IPCHandle const&, WebCore::CAAudioStreamDescription const&, unsigned long long, IPC::Semaphore&&, WTF::MediaTime const&, unsigned long), std::__1::tuple<WTF::ObjectIdentifier<WebCore::RealtimeMediaSourceIdentifierType>, WebKit::SharedMemory::IPCHandle, WebCore::CAAudioStreamDescription, unsigned long long, IPC::Semaphore, WTF::MediaTime, unsigned long>, 0ul, 1ul, 2ul, 3ul, 4ul, 5ul, 6ul>(WebKit::RemoteCaptureSampleManager*, void (WebKit::RemoteCaptureSampleManager::*)(WTF::ObjectIdentifier<WebCore::RealtimeMediaSourceIdentifierType>, WebKit::SharedMemory::IPCHandle const&, WebCore::CAAudioStreamDescription const&, unsigned long long, IPC::Semaphore&&, WTF::MediaTime const&, unsigned long), std::__1::tuple<WTF::ObjectIdentifier<WebCore::RealtimeMediaSourceIdentifierType>, WebKit::SharedMemory::IPCHandle, WebCore::CAAudioStreamDescription, unsigned long long, IPC::Semaphore, WTF::MediaTime, unsigned long>&&, std::__1::integer_sequence<unsigned long, 0ul, 1ul, 2ul, 3ul, 4ul, 5ul, 6ul>) <null> (WebKit:x86_64+0x494848)
    #7 void IPC::callMemberFunction<WebKit::RemoteCaptureSampleManager, void (WebKit::RemoteCaptureSampleManager::*)(WTF::ObjectIdentifier<WebCore::RealtimeMediaSourceIdentifierType>, WebKit::SharedMemory::IPCHandle const&, WebCore::CAAudioStreamDescription const&, unsigned long long, IPC::Semaphore&&, WTF::MediaTime const&, unsigned long), std::__1::tuple<WTF::ObjectIdentifier<WebCore::RealtimeMediaSourceIdentifierType>, WebKit::SharedMemory::IPCHandle, WebCore::CAAudioStreamDescription, unsigned long long, IPC::Semaphore, WTF::MediaTime, unsigned long>, std::__1::integer_sequence<unsigned long, 0ul, 1ul, 2ul, 3ul, 4ul, 5ul, 6ul> >(std::__1::tuple<WTF::ObjectIdentifier<WebCore::RealtimeMediaSourceIdentifierType>, WebKit::SharedMemory::IPCHandle, WebCore::CAAudioStreamDescription, unsigned long long, IPC::Semaphore, WTF::MediaTime, unsigned long>&&, WebKit::RemoteCaptureSampleManager*, void (WebKit::RemoteCaptureSampleManager::*)(WTF::ObjectIdentifier<WebCore::RealtimeMediaSourceIdentifierType>, WebKit::SharedMemory::IPCHandle const&, WebCore::CAAudioStreamDescription const&, unsigned long long, IPC::Semaphore&&, WTF::MediaTime const&, unsigned long)) <null> (WebKit:x86_64+0x48ab48)
    #8 void IPC::handleMessage<Messages::RemoteCaptureSampleManager::AudioStorageChanged, WebKit::RemoteCaptureSampleManager, void (WebKit::RemoteCaptureSampleManager::*)(WTF::ObjectIdentifier<WebCore::RealtimeMediaSourceIdentifierType>, WebKit::SharedMemory::IPCHandle const&, WebCore::CAAudioStreamDescription const&, unsigned long long, IPC::Semaphore&&, WTF::MediaTime const&, unsigned long)>(IPC::Decoder&, WebKit::RemoteCaptureSampleManager*, void (WebKit::RemoteCaptureSampleManager::*)(WTF::ObjectIdentifier<WebCore::RealtimeMediaSourceIdentifierType>, WebKit::SharedMemory::IPCHandle const&, WebCore::CAAudioStreamDescription const&, unsigned long long, IPC::Semaphore&&, WTF::MediaTime const&, unsigned long)) <null> (WebKit:x86_64+0x48a97b)
    #9 WebKit::RemoteCaptureSampleManager::didReceiveMessage(IPC::Connection&, IPC::Decoder&) <null> (WebKit:x86_64+0x48a8b0)
    #10 IPC::Connection::dispatchMessageReceiverMessage(IPC::MessageReceiver&, std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >&&) <null> (WebKit:x86_64+0x8d271)
    #11 IPC::ThreadMessageReceiverQueue::enqueueMessage(IPC::Connection&, std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >&&)::'lambda'()::operator()() <null> (WebKit:x86_64+0x9632e)
    #12 WTF::Detail::CallableWrapper<IPC::ThreadMessageReceiverQueue::enqueueMessage(IPC::Connection&, std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >&&)::'lambda'(), void>::call() <null> (WebKit:x86_64+0x9610d)
    #13 WTF::Function<void ()>::operator()() const <null> (JavaScriptCore:x86_64+0x2620d)
    #14 WTF::(anonymous namespace)::DispatchWorkItem::operator()() <null> (JavaScriptCore:x86_64+0x11285d)
    #15 void WTF::dispatchWorkItem<WTF::(anonymous namespace)::DispatchWorkItem>(void*) <null> (JavaScriptCore:x86_64+0x111849)
    #16 __tsan::dispatch_callback_wrap(void*) <null> (libclang_rt.tsan_osx_dynamic.dylib:x86_64+0x734d1)
    #17 _dispatch_client_callout <null> (libdispatch.dylib:x86_64+0x34ff)

  Thread T16 (tid=13416360, running) created by main thread at:
    #0 pthread_create <null> (libclang_rt.tsan_osx_dynamic.dylib:x86_64+0x2bffd)
    #1 WTF::Thread::establishHandle(WTF::Thread::NewThreadContext*, std::__1::optional<unsigned long>, WTF::Thread::QOS) <null> (JavaScriptCore:x86_64+0xc565e)
    #2 WTF::Thread::create(char const*, WTF::Function<void ()>&&, WTF::ThreadType, WTF::Thread::QOS) <null> (JavaScriptCore:x86_64+0xbcea7)
    #3 WebKit::RemoteAudioDestinationProxy::startRenderingThread() <null> (WebKit:x86_64+0x1978f4a)
    #4 WebKit::RemoteAudioDestinationProxy::connection() <null> (WebKit:x86_64+0x1979246)
    #5 WebKit::RemoteAudioDestinationProxy::startRendering(WTF::CompletionHandler<void (bool)>&&) <null> (WebKit:x86_64+0x1979a65)
    #6 WebCore::AudioDestinationCocoa::start(WTF::Function<void (WTF::Function<void ()>&&)>&&, WTF::CompletionHandler<void (bool)>&&) <null> (WebCore:x86_64+0x2f03b7b)
    #7 WebCore::DefaultAudioDestinationNode::startRendering(WTF::CompletionHandler<void (std::__1::optional<WebCore::Exception>&&)>&&) <null> (WebCore:x86_64+0x191fdc7)
    #8 WebCore::AudioContext::startRendering() <null> (WebCore:x86_64+0x18a59dd)
    #9 WebCore::AudioContext::lazyInitialize() <null> (WebCore:x86_64+0x18a4e35)
    #10 WebCore::AudioContext::AudioContext(WebCore::Document&, WebCore::AudioContextOptions const&)::$_1::operator()() const <null> (WebCore:x86_64+0x18c0a30)
    #11 WTF::Detail::CallableWrapper<WebCore::AudioContext::AudioContext(WebCore::Document&, WebCore::AudioContextOptions const&)::$_1, void>::call() <null> (WebCore:x86_64+0x18c087d)
    #12 WTF::Function<void ()>::operator()() const <null> (WebCore:x86_64+0x1c7dd)
    #13 void WebCore::ActiveDOMObject::queueTaskKeepingObjectAlive<WebCore::BaseAudioContext>(WebCore::BaseAudioContext&, WebCore::TaskSource, WTF::Function<void ()>&&)::'lambda'()::operator()() const <null> (WebCore:x86_64+0x19126ed)
    #14 WTF::Detail::CallableWrapper<void WebCore::ActiveDOMObject::queueTaskKeepingObjectAlive<WebCore::BaseAudioContext>(WebCore::BaseAudioContext&, WebCore::TaskSource, WTF::Function<void ()>&&)::'lambda'(), void>::call() <null> (WebCore:x86_64+0x19124fd)
    #15 WTF::Function<void ()>::operator()() const <null> (WebCore:x86_64+0x1c7dd)
    #16 WebCore::EventLoopFunctionDispatchTask::execute() <null> (WebCore:x86_64+0x21e4e9d)
    #17 WebCore::EventLoop::run() <null> (WebCore:x86_64+0x21dac58)
    #18 WebCore::WindowEventLoop::didReachTimeToRun() <null> (WebCore:x86_64+0x22f302d)
    #19 decltype(*(std::__1::forward<WebCore::WindowEventLoop*&>(fp0)).*fp()) std::__1::__invoke<void (WebCore::WindowEventLoop::*&)(), WebCore::WindowEventLoop*&, void>(void (WebCore::WindowEventLoop::*&)(), WebCore::WindowEventLoop*&) <null> (WebCore:x86_64+0x22f4f0d)
    #20 std::__1::__bind_return<void (WebCore::WindowEventLoop::*)(), std::__1::tuple<WebCore::WindowEventLoop*>, std::__1::tuple<>, __is_valid_bind_return<void (WebCore::WindowEventLoop::*)(), std::__1::tuple<WebCore::WindowEventLoop*>, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (WebCore::WindowEventLoop::*)(), std::__1::tuple<WebCore::WindowEventLoop*>, 0ul, std::__1::tuple<> >(void (WebCore::WindowEventLoop::*&)(), std::__1::tuple<WebCore::WindowEventLoop*>&, std::__1::__tuple_indices<0ul>, std::__1::tuple<>&&) <null> (WebCore:x86_64+0x22f4e89)
    #21 std::__1::__bind_return<void (WebCore::WindowEventLoop::*)(), std::__1::tuple<WebCore::WindowEventLoop*>, std::__1::tuple<>, __is_valid_bind_return<void (WebCore::WindowEventLoop::*)(), std::__1::tuple<WebCore::WindowEventLoop*>, std::__1::tuple<> >::value>::type std::__1::__bind<void (WebCore::WindowEventLoop::*&)(), WebCore::WindowEventLoop*>::operator()<>() <null> (WebCore:x86_64+0x22f4e41)
    #22 WTF::Detail::CallableWrapper<std::__1::__bind<void (WebCore::WindowEventLoop::*&)(), WebCore::WindowEventLoop*>, void>::call() <null> (WebCore:x86_64+0x22f4d7d)
    #23 WTF::Function<void ()>::operator()() const <null> (WebCore:x86_64+0x1c7dd)
    #24 WebCore::Timer::fired() <null> (WebCore:x86_64+0x5d35d)
    #25 WebCore::ThreadTimers::sharedTimerFiredInternal() <null> (WebCore:x86_64+0x2eb8247)
    #26 WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0::operator()() const <null> (WebCore:x86_64+0x2ebfb11)
    #27 WTF::Detail::CallableWrapper<WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0, void>::call() <null> (WebCore:x86_64+0x2ebfab1)
    #28 WTF::Function<void ()>::operator()() const <null> (WebCore:x86_64+0x1c7dd)
    #29 WebCore::MainThreadSharedTimer::fired() <null> (WebCore:x86_64+0x2e7ad6d)
    #30 WebCore::timerFired(__CFRunLoopTimer*, void*) <null> (WebCore:x86_64+0x2f22677)
    #31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ <null> (CoreFoundation:x86_64+0x99f28)
    #32 WKXPCServiceMain <null> (WebKit:x86_64+0x22543fe)
    #33 main <null> (com.apple.WebKit.WebContent.Development:x86_64+0x100003e3e)

SUMMARY: ThreadSanitizer: data race (WebKitBuild/WebCore.framework/Versions/A/WebCore:x86_64+0x2f166ca) in WebCore::CARingBufferStorageVector::setCurrentFrameBounds(unsigned long long, unsigned long long)+0x6a

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