iOS Crash related to javascript core, web thread - ios

getting lots of crashes in ios11 as below: webkit framework is included in project. any idea what could be reason for this crash ?
Crashed: WebThread
0 JavaScriptCore 0x18bdbeebc bmalloc::Heap::allocateSmallChunk(std::__1::lock_guard<bmalloc::StaticMutex>&, unsigned long) + 680
1 JavaScriptCore 0x18bdbec70 bmalloc::Heap::allocateSmallChunk(std::__1::lock_guard<bmalloc::StaticMutex>&, unsigned long) + 92
2 JavaScriptCore 0x18bdbef58 bmalloc::Heap::allocateSmallPage(std::__1::lock_guard<bmalloc::StaticMutex>&, unsigned long, std::__1::array<bmalloc::List<bmalloc::SmallPage>, 112ul>&) + 152
3 JavaScriptCore 0x18bdbf45c bmalloc::Heap::allocateSmallBumpRangesByObject(std::__1::lock_guard<bmalloc::StaticMutex>&, unsigned long, bmalloc::BumpAllocator&, bmalloc::FixedVector<bmalloc::BumpRange, 3ul>&, std::__1::array<bmalloc::List<bmalloc::SmallPage>, 112ul>&) + 52
4 JavaScriptCore 0x18bdbd228 bmalloc::Allocator::refillAllocatorSlowCase(bmalloc::BumpAllocator&, unsigned long) + 160
5 JavaScriptCore 0x18bdbd358 bmalloc::Allocator::allocateLogSizeClass(unsigned long) + 160
6 JavaScriptCore 0x18bba1cec JSC::MarkedBlock::tryCreate(JSC::Heap&) + 36
7 JavaScriptCore 0x18bba10c0 JSC::MarkedAllocator::allocateSlowCaseImpl(JSC::GCDeferralContext*, bool) + 368
8 JavaScriptCore 0x18bce69d0 JSC::Subspace::allocate(unsigned long) + 152
9 JavaScriptCore 0x18bcfb7a0 JSC::UnlinkedFunctionExecutable::link(JSC::VM&, JSC::SourceCode const&, std::optional<int>, JSC::Intrinsic) + 236
10 JavaScriptCore 0x18b6c9b98 JSC::CodeBlock::finishCreation(JSC::VM&, JSC::ScriptExecutable*, JSC::UnlinkedCodeBlock*, JSC::JSScope*) + 1964
11 JavaScriptCore 0x18bcb9f64 JSC::ScriptExecutable::newCodeBlockFor(JSC::CodeSpecializationKind, JSC::JSFunction*, JSC::JSScope*, JSC::JSObject*&) + 1088
12 JavaScriptCore 0x18bcba384 JSC::ScriptExecutable::prepareForExecutionImpl(JSC::VM&, JSC::JSFunction*, JSC::JSScope*, JSC::CodeSpecializationKind, JSC::CodeBlock*&) + 240
13 JavaScriptCore 0x18b454718 JSC::LLInt::setUpCall(JSC::ExecState*, JSC::Instruction*, JSC::CodeSpecializationKind, JSC::JSValue, JSC::LLIntCallLinkInfo*) + 672
14 JavaScriptCore 0x18bb9b444 llint_entry + 26996
15 JavaScriptCore 0x18bb94900 vmEntryToJavaScript + 272
16 JavaScriptCore 0x18ba73190 JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) + 184
17 JavaScriptCore 0x18ba47af4 JSC::Interpreter::executeProgram(JSC::SourceCode const&, JSC::ExecState*, JSC::JSObject*) + 12168
18 JavaScriptCore 0x18b7108e8 JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) + 340
19 WebCore 0x18d77fe4c WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld&, WebCore::ExceptionDetails*) + 324
20 WebCore 0x18d786458 WebCore::ScriptElement::executeClassicScript(WebCore::ScriptSourceCode const&) + 584
21 WebCore 0x18d4c5750 WebCore::LoadableClassicScript::execute(WebCore::ScriptElement&) + 164
22 WebCore 0x18d7866fc WebCore::ScriptElement::executeScriptAndDispatchEvent(WebCore::LoadableScript&) + 216
23 WebCore 0x18d78ce0c WebCore::ScriptRunner::timerFired() + 456
24 WebCore 0x18c85b000 WebCore::ThreadTimers::sharedTimerFiredInternal() + 172
25 WebCore 0x18c85af40 WebCore::timerFired(__CFRunLoopTimer*, void*) + 28
26 CoreFoundation 0x1849fefc0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 28
27 CoreFoundation 0x1849fece4 __CFRunLoopDoTimer + 864
28 CoreFoundation 0x1849fe4e4 __CFRunLoopDoTimers + 248
29 CoreFoundation 0x1849fc0cc __CFRunLoopRun + 1928
30 CoreFoundation 0x18491be58 CFRunLoopRunSpecific + 436
31 WebCore 0x18c88ca34 RunWebThread(void*) + 560
32 libsystem_pthread.dylib 0x18467c2b4 _pthread_body + 308
33 libsystem_pthread.dylib 0x18467c180 _pthread_body + 310
34 libsystem_pthread.dylib 0x18467ab74 thread_start + 4

Related

UIWebView WebCore TimerBase crash only on 11.3 (15E216) : SIGTRAP WebCore _ZN7WebCore9TimerBaseD2Ev

I've recently got a crash report from Crash Report Tools. This crash is being refered to UIWebView WebCore crash, my app uses UIWebView only ,And i can't switch to WKWebview recently. Below is the crash report,and I can't reproduce it. It happened on device iPhone 6,7,8,X, but only using version iOS 11.3 (15E216).
this crash has 3 diffrent crash stack. Any advice would be helpful.
type 1:
0 WebCore WebCore::TimerBase::~TimerBase() + 120
1 WebCore WebCore::TimerBase::~TimerBase() + 40
2 WebCore WebCore::ImageLoader::~ImageLoader() + 2076
3 WebCore WebCore::HTMLImageElement::~HTMLImageElement() + 224
4 WebCore WebCore::HTMLImageElement::~HTMLImageElement() + 12
5 JavaScriptCore void JSC::MarkedBlock::Handle::specializedSweep<true, (JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1, JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::MarkedBlock::Handle::EmptyMode, JSC::MarkedBlock::Handle::SweepMode, JSC::MarkedBlock::Handle::SweepDestructionMode, JSC::MarkedBlock::Handle::ScribbleMode, JSC::MarkedBlock::Handle::NewlyAllocatedMode, JSC::MarkedBlock::Handle::MarksMode, JSC::JSDestructibleObjectDestroyFunc const&) + 212
type 2:
0 WebCore WebCore::TimerBase::~TimerBase() + 120
1 WebCore WebCore::TimerBase::~TimerBase() + 40
2 WebCore WebCore::XMLHttpRequest::~XMLHttpRequest() + 116
3 WebCore WebCore::XMLHttpRequest::~XMLHttpRequest() + 12
4 JavaScriptCore void JSC::MarkedBlock::Handle::specializedSweep<true, (JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1, JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::MarkedBlock::Handle::EmptyMode, JSC::MarkedBlock::Handle::SweepMode, JSC::MarkedBlock::Handle::SweepDestructionMode, JSC::MarkedBlock::Handle::ScribbleMode, JSC::MarkedBlock::Handle::NewlyAllocatedMode, JSC::MarkedBlock::Handle::MarksMode, JSC::JSDestructibleObjectDestroyFunc const&) + 212
5 JavaScriptCore void JSC::MarkedBlock::Handle::finishSweepKnowingHeapCellType<JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::JSDestructibleObjectDestroyFunc const&)::'lambda'()::operator()() const + 408
type 3:
0 WebCore WebCore::TimerBase::~TimerBase() + 120
1 WebCore WebCore::TimerBase::~TimerBase() + 40
2 WebCore WebCore::MediaElementSession::~MediaElementSession() + 96
3 WebCore WebCore::HTMLMediaElement::~HTMLMediaElement() + 1340
4 WebCore WebCore::HTMLVideoElement::~HTMLVideoElement() + 176
5 JavaScriptCore void JSC::MarkedBlock::Handle::specializedSweep<true, (JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1, JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::MarkedBlock::Handle::EmptyMode, JSC::MarkedBlock::Handle::SweepMode, JSC::MarkedBlock::Handle::SweepDestructionMode, JSC::MarkedBlock::Handle::ScribbleMode, JSC::MarkedBlock::Handle::NewlyAllocatedMode, JSC::MarkedBlock::Handle::MarksMode, JSC::JSDestructibleObjectDestroyFunc const&) + 212
==
fully crash stack:
type 1:
#0 Thread
SIGTRAP
0 WebCore WebCore::TimerBase::~TimerBase() + 120
1 WebCore WebCore::TimerBase::~TimerBase() + 40
2 WebCore WebCore::ImageLoader::~ImageLoader() + 2076
3 WebCore WebCore::HTMLImageElement::~HTMLImageElement() + 224
4 WebCore WebCore::HTMLImageElement::~HTMLImageElement() + 12
5 JavaScriptCore void JSC::MarkedBlock::Handle::specializedSweep<true, (JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1, JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::MarkedBlock::Handle::EmptyMode, JSC::MarkedBlock::Handle::SweepMode, JSC::MarkedBlock::Handle::SweepDestructionMode, JSC::MarkedBlock::Handle::ScribbleMode, JSC::MarkedBlock::Handle::NewlyAllocatedMode, JSC::MarkedBlock::Handle::MarksMode, JSC::JSDestructibleObjectDestroyFunc const&) + 212
6 JavaScriptCore void JSC::MarkedBlock::Handle::finishSweepKnowingHeapCellType<JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::JSDestructibleObjectDestroyFunc const&)::'lambda'()::operator()() const + 408
7 JavaScriptCore void JSC::MarkedBlock::Handle::finishSweepKnowingHeapCellType<JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::JSDestructibleObjectDestroyFunc const&) + 320
8 JavaScriptCore JSC::JSDestructibleObjectHeapCellType::finishSweep(JSC::MarkedBlock::Handle&, JSC::FreeList*) + 32
9 JavaScriptCore JSC::MarkedBlock::Handle::sweep(JSC::FreeList*) + 372
10 JavaScriptCore JSC::LocalAllocator::tryAllocateIn(JSC::MarkedBlock::Handle*) + 40
11 JavaScriptCore JSC::LocalAllocator::tryAllocateWithoutCollecting() + 48
12 JavaScriptCore JSC::LocalAllocator::allocateSlowCase(JSC::GCDeferralContext*, JSC::AllocationFailureMode) + 292
13 JavaScriptCore JSC::CompleteSubspace::allocateNonVirtual(JSC::VM&, unsigned long, JSC::GCDeferralContext*, JSC::AllocationFailureMode) + 216
14 WebCore std::__1::enable_if<std::is_same<WebCore::GainNode, WebCore::GainNode>::value, WebCore::JSDOMWrapperConverterTraits<WebCore::GainNode>::WrapperClass*>::type WebCore::createWrapper<WebCore::GainNode, WebCore::GainNode>(WebCore::JSDOMGlobalObject*, ***::Ref<WebCore::GainNode, ***::DumbPtrTraits<WebCore::GainNode> >&&) + 220
15 WebCore WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::GainNode&) + 136
16 WebCore WebCore::jsAudioContextPrototypeFunctionCreateGain(JSC::ExecState*) + 264
17 JavaScriptCore _llint_entry + 31860
18 JavaScriptCore _llint_entry + 29020
19 JavaScriptCore _llint_entry + 30040
20 JavaScriptCore _llint_entry + 29020
21 JavaScriptCore _llint_entry + 29020
22 JavaScriptCore _llint_entry + 29020
23 JavaScriptCore _llint_entry + 29020
24 JavaScriptCore _llint_entry + 29020
25 JavaScriptCore _llint_entry + 29020
26 JavaScriptCore _llint_entry + 29020
27 JavaScriptCore _llint_entry + 29020
28 JavaScriptCore _llint_entry + 29020
29 JavaScriptCore _llint_entry + 29020
30 JavaScriptCore _llint_entry + 29020
31 JavaScriptCore _llint_entry + 29020
32 JavaScriptCore _llint_entry + 29020
33 JavaScriptCore _llint_entry + 29020
34 JavaScriptCore _llint_entry + 29020
35 JavaScriptCore _llint_entry + 29020
36 JavaScriptCore _vmEntryToJavaScript + 272
37 JavaScriptCore JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) + 184
38 JavaScriptCore JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 464
39 JavaScriptCore JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, ***::NakedPtr<JSC::Exception>&) + 180
40 WebCore WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) + 1176
41 WebCore WebCore::EventTarget::fireEventListeners(WebCore::Event&, ***::Vector<***::RefPtr<WebCore::RegisteredEventListener, ***::DumbPtrTraits<WebCore::RegisteredEventListener> >, 1ul, ***::CrashOnOverflow, 16ul, ***::FastMalloc>) + 760
42 WebCore WebCore::EventTarget::fireEventListeners(WebCore::Event&) + 596
43 WebCore WebCore::EventTarget::dispatchEvent(WebCore::Event&) + 116
44 WebCore WebCore::WebSocket::didReceiveBinaryData(***::Vector<unsigned char, 0ul, ***::CrashOnOverflow, 16ul, ***::FastMalloc>&&) + 236
45 WebCore WebCore::WebSocketChannel::processFrame() + 2912
46 WebCore WebCore::WebSocketChannel::processBuffer() + 112
47 WebCore WebCore::WebSocketChannel::didReceiveSocketStreamData(WebCore::SocketStreamHandle&, char const*, unsigned long) + 112
48 WebCore WebCore::SocketStreamHandleImpl::readStreamCallback(unsigned long) + 544
49 CoreFoundation __signalEventSync + 212
50 CoreFoundation __cfstream_solo_signalEventSync + 260
51 CoreFoundation __CFStreamSignalEvent + 548
52 CFNetwork SocketStream::dispatchSignalFromSocketCallbackUnlocked(SocketStreamSignalHolder*) + 64
53 CFNetwork SocketStream::socketCallback(__CFSocket*, unsigned long, __CFData const*, void const*) + 148
54 CFNetwork SocketStream::_SocketCallBack_stream(__CFSocket*, unsigned long, __CFData const*, void const*, void*) + 88
55 CoreFoundation ___CFSocketPerformV0 + 1352
56 CoreFoundation ___CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
57 CoreFoundation ___CFRunLoopDoSources0 + 276
58 CoreFoundation ___CFRunLoopRun + 1204
59 CoreFoundation CFRunLoopRunSpecific + 552
60 GraphicsServices GSEventRunModal + 100
61 UIKit UIApplicationMain + 236
62 x5gamehelper main + 88
63 libdyld.dylib _start + 4
type 2:
#0 Thread
SIGTRAP
0 WebCore WebCore::TimerBase::~TimerBase() + 120
1 WebCore WebCore::TimerBase::~TimerBase() + 40
2 WebCore WebCore::XMLHttpRequest::~XMLHttpRequest() + 116
3 WebCore WebCore::XMLHttpRequest::~XMLHttpRequest() + 12
4 JavaScriptCore void JSC::MarkedBlock::Handle::specializedSweep<true, (JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1, JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::MarkedBlock::Handle::EmptyMode, JSC::MarkedBlock::Handle::SweepMode, JSC::MarkedBlock::Handle::SweepDestructionMode, JSC::MarkedBlock::Handle::ScribbleMode, JSC::MarkedBlock::Handle::NewlyAllocatedMode, JSC::MarkedBlock::Handle::MarksMode, JSC::JSDestructibleObjectDestroyFunc const&) + 212
5 JavaScriptCore void JSC::MarkedBlock::Handle::finishSweepKnowingHeapCellType<JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::JSDestructibleObjectDestroyFunc const&)::'lambda'()::operator()() const + 408
6 JavaScriptCore void JSC::MarkedBlock::Handle::finishSweepKnowingHeapCellType<JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::JSDestructibleObjectDestroyFunc const&) + 320
7 JavaScriptCore JSC::JSDestructibleObjectHeapCellType::finishSweep(JSC::MarkedBlock::Handle&, JSC::FreeList*) + 32
8 JavaScriptCore JSC::MarkedBlock::Handle::sweep(JSC::FreeList*) + 372
9 JavaScriptCore JSC::LocalAllocator::tryAllocateIn(JSC::MarkedBlock::Handle*) + 40
10 JavaScriptCore JSC::LocalAllocator::tryAllocateWithoutCollecting() + 48
11 JavaScriptCore JSC::LocalAllocator::allocateSlowCase(JSC::GCDeferralContext*, JSC::AllocationFailureMode) + 292
12 JavaScriptCore JSC::CompleteSubspace::allocateNonVirtual(JSC::VM&, unsigned long, JSC::GCDeferralContext*, JSC::AllocationFailureMode) + 216
13 WebCore std::__1::enable_if<std::is_same<WebCore::GainNode, WebCore::GainNode>::value, WebCore::JSDOMWrapperConverterTraits<WebCore::GainNode>::WrapperClass*>::type WebCore::createWrapper<WebCore::GainNode, WebCore::GainNode>(WebCore::JSDOMGlobalObject*, ***::Ref<WebCore::GainNode, ***::DumbPtrTraits<WebCore::GainNode> >&&) + 220
14 WebCore WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::GainNode&) + 136
15 WebCore WebCore::jsAudioContextPrototypeFunctionCreateGain(JSC::ExecState*) + 264
16 JavaScriptCore _llint_entry + 31860
17 JavaScriptCore _llint_entry + 29020
18 JavaScriptCore _llint_entry + 30040
19 JavaScriptCore _llint_entry + 29020
20 JavaScriptCore _llint_entry + 29020
21 JavaScriptCore _llint_entry + 29020
22 JavaScriptCore _llint_entry + 29020
23 JavaScriptCore _llint_entry + 29020
24 JavaScriptCore _llint_entry + 29020
25 JavaScriptCore _llint_entry + 29020
26 JavaScriptCore _llint_entry + 29020
27 JavaScriptCore _llint_entry + 29020
28 JavaScriptCore _llint_entry + 29020
29 JavaScriptCore _llint_entry + 28904
30 JavaScriptCore _llint_entry + 28904
31 JavaScriptCore _llint_entry + 28904
32 JavaScriptCore _llint_entry + 29020
33 JavaScriptCore _llint_entry + 29020
34 JavaScriptCore _llint_entry + 28904
35 JavaScriptCore _llint_entry + 29020
36 JavaScriptCore _llint_entry + 29020
37 JavaScriptCore _vmEntryToJavaScript + 272
38 JavaScriptCore JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) + 184
39 JavaScriptCore JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 464
40 JavaScriptCore JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, ***::NakedPtr<JSC::Exception>&) + 180
41 WebCore WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) + 1176
42 WebCore WebCore::EventTarget::fireEventListeners(WebCore::Event&, ***::Vector<***::RefPtr<WebCore::RegisteredEventListener, ***::DumbPtrTraits<WebCore::RegisteredEventListener> >, 1ul, ***::CrashOnOverflow, 16ul, ***::FastMalloc>) + 760
43 WebCore WebCore::EventTarget::fireEventListeners(WebCore::Event&) + 596
44 WebCore WebCore::EventTarget::dispatchEvent(WebCore::Event&) + 116
45 WebCore WebCore::WebSocket::didReceiveBinaryData(***::Vector<unsigned char, 0ul, ***::CrashOnOverflow, 16ul, ***::FastMalloc>&&) + 236
46 WebCore WebCore::WebSocketChannel::processFrame() + 2912
47 WebCore WebCore::WebSocketChannel::processBuffer() + 112
48 WebCore WebCore::WebSocketChannel::didReceiveSocketStreamData(WebCore::SocketStreamHandle&, char const*, unsigned long) + 112
49 WebCore WebCore::SocketStreamHandleImpl::readStreamCallback(unsigned long) + 544
50 CoreFoundation __signalEventSync + 212
51 CoreFoundation __cfstream_solo_signalEventSync + 260
52 CoreFoundation __CFStreamSignalEvent + 548
53 CFNetwork SocketStream::dispatchSignalFromSocketCallbackUnlocked(SocketStreamSignalHolder*) + 64
54 CFNetwork SocketStream::socketCallback(__CFSocket*, unsigned long, __CFData const*, void const*) + 148
55 CFNetwork SocketStream::_SocketCallBack_stream(__CFSocket*, unsigned long, __CFData const*, void const*, void*) + 88
56 CoreFoundation ___CFSocketPerformV0 + 1352
57 CoreFoundation ___CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
58 CoreFoundation ___CFRunLoopDoSources0 + 276
59 CoreFoundation ___CFRunLoopRun + 1204
60 CoreFoundation CFRunLoopRunSpecific + 552
61 GraphicsServices GSEventRunModal + 100
62 UIKit UIApplicationMain + 236
63 x5gamehelper main + 88
64 libdyld.dylib _start + 4
type 3:
#0 Thread
SIGTRAP
0 WebCore WebCore::TimerBase::~TimerBase() + 120
1 WebCore WebCore::TimerBase::~TimerBase() + 40
2 WebCore WebCore::MediaElementSession::~MediaElementSession() + 96
3 WebCore WebCore::HTMLMediaElement::~HTMLMediaElement() + 1340
4 WebCore WebCore::HTMLVideoElement::~HTMLVideoElement() + 176
5 JavaScriptCore void JSC::MarkedBlock::Handle::specializedSweep<true, (JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1, JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::MarkedBlock::Handle::EmptyMode, JSC::MarkedBlock::Handle::SweepMode, JSC::MarkedBlock::Handle::SweepDestructionMode, JSC::MarkedBlock::Handle::ScribbleMode, JSC::MarkedBlock::Handle::NewlyAllocatedMode, JSC::MarkedBlock::Handle::MarksMode, JSC::JSDestructibleObjectDestroyFunc const&) + 212
6 JavaScriptCore void JSC::MarkedBlock::Handle::finishSweepKnowingHeapCellType<JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::JSDestructibleObjectDestroyFunc const&)::'lambda'()::operator()() const + 408
7 JavaScriptCore void JSC::MarkedBlock::Handle::finishSweepKnowingHeapCellType<JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::JSDestructibleObjectDestroyFunc const&) + 320
8 JavaScriptCore JSC::JSDestructibleObjectHeapCellType::finishSweep(JSC::MarkedBlock::Handle&, JSC::FreeList*) + 32
9 JavaScriptCore JSC::MarkedBlock::Handle::sweep(JSC::FreeList*) + 372
10 JavaScriptCore JSC::LocalAllocator::tryAllocateIn(JSC::MarkedBlock::Handle*) + 40
11 JavaScriptCore JSC::LocalAllocator::tryAllocateWithoutCollecting() + 48
12 JavaScriptCore JSC::LocalAllocator::allocateSlowCase(JSC::GCDeferralContext*, JSC::AllocationFailureMode) + 292
13 JavaScriptCore JSC::CompleteSubspace::allocateNonVirtual(JSC::VM&, unsigned long, JSC::GCDeferralContext*, JSC::AllocationFailureMode) + 216
14 WebCore std::__1::enable_if<std::is_same<WebCore::WebSocket, WebCore::WebSocket>::value, WebCore::JSDOMWrapperConverterTraits<WebCore::WebSocket>::WrapperClass*>::type WebCore::createWrapper<WebCore::WebSocket, WebCore::WebSocket>(WebCore::JSDOMGlobalObject*, ***::Ref<WebCore::WebSocket, ***::DumbPtrTraits<WebCore::WebSocket> >&&) + 220
15 WebCore WebCore::constructJSWebSocket1(JSC::ExecState*) + 284
16 WebCore WebCore::JSDOMConstructor<WebCore::JSWebSocket>::construct(JSC::ExecState*) + 136
17 JavaScriptCore JSC::LLInt::setUpCall(JSC::ExecState*, JSC::Instruction*, JSC::CodeSpecializationKind, JSC::JSValue, JSC::LLIntCallLinkInfo*) + 580
18 JavaScriptCore _llint_entry + 30024
19 JavaScriptCore _llint_entry + 28904
20 JavaScriptCore _llint_entry + 28904
21 JavaScriptCore _llint_entry + 29020
22 JavaScriptCore _llint_entry + 28904
23 JavaScriptCore _llint_entry + 28904
24 JavaScriptCore _llint_entry + 29020
25 JavaScriptCore _llint_entry + 29020
26 JavaScriptCore _llint_entry + 29020
27 JavaScriptCore _llint_entry + 29020
28 JavaScriptCore _vmEntryToJavaScript + 272
29 JavaScriptCore JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) + 184
30 JavaScriptCore JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 464
31 JavaScriptCore JSC::boundThisNoArgsFunctionCall(JSC::ExecState*) + 512
32 JavaScriptCore _llint_entry + 31860
33 JavaScriptCore _llint_entry + 29020
34 JavaScriptCore _vmEntryToJavaScript + 272
35 JavaScriptCore JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) + 184
36 JavaScriptCore JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 464
37 JavaScriptCore JSC::boundThisNoArgsFunctionCall(JSC::ExecState*) + 512
38 JavaScriptCore _llint_entry + 31860
39 JavaScriptCore _llint_entry + 29020
40 JavaScriptCore _llint_entry + 29020
41 JavaScriptCore _llint_entry + 29020
42 JavaScriptCore _llint_entry + 28904
43 JavaScriptCore _llint_entry + 29020
44 JavaScriptCore _llint_entry + 28904
45 JavaScriptCore _llint_entry + 28904
46 JavaScriptCore _llint_entry + 28904
47 JavaScriptCore _vmEntryToJavaScript + 272
48 JavaScriptCore JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) + 184
49 JavaScriptCore JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 464
50 JavaScriptCore JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, ***::NakedPtr<JSC::Exception>&) + 180
51 WebCore WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) + 1176
52 WebCore WebCore::EventTarget::fireEventListeners(WebCore::Event&, ***::Vector<***::RefPtr<WebCore::RegisteredEventListener, ***::DumbPtrTraits<WebCore::RegisteredEventListener> >, 1ul, ***::CrashOnOverflow, 16ul, ***::FastMalloc>) + 760
53 WebCore WebCore::EventTarget::fireEventListeners(WebCore::Event&) + 596
54 WebCore WebCore::EventTarget::dispatchEvent(WebCore::Event&) + 116
55 WebCore WebCore::WebSocket::didReceiveBinaryData(***::Vector<unsigned char, 0ul, ***::CrashOnOverflow, 16ul, ***::FastMalloc>&&) + 236
56 WebCore WebCore::WebSocketChannel::processFrame() + 2912
57 WebCore WebCore::WebSocketChannel::processBuffer() + 112
58 WebCore WebCore::WebSocketChannel::didReceiveSocketStreamData(WebCore::SocketStreamHandle&, char const*, unsigned long) + 112
59 WebCore WebCore::SocketStreamHandleImpl::readStreamCallback(unsigned long) + 544
60 CoreFoundation __signalEventSync + 212
61 CoreFoundation __cfstream_solo_signalEventSync + 260
62 CoreFoundation __CFStreamSignalEvent + 548
63 CFNetwork SocketStream::dispatchSignalFromSocketCallbackUnlocked(SocketStreamSignalHolder*) + 64
64 CFNetwork SocketStream::socketCallback(__CFSocket*, unsigned long, __CFData const*, void const*) + 148
65 CFNetwork SocketStream::_SocketCallBack_stream(__CFSocket*, unsigned long, __CFData const*, void const*, void*) + 88
66 CoreFoundation ___CFSocketPerformV0 + 1352
67 CoreFoundation ___CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
68 CoreFoundation ___CFRunLoopDoSources0 + 276
69 CoreFoundation ___CFRunLoopRun + 1204
70 CoreFoundation CFRunLoopRunSpecific + 552
71 GraphicsServices GSEventRunModal + 100
72 UIKit UIApplicationMain + 236
73 x5gamehelper main + 88
74 libdyld.dylib _start + 4
Can anybody help me ? :)

I had faced same type of issue due to JavaScriptCore. After wasted 3-4 days time, Finally got below solution.
Just disable JSC_useJIT envirnment to false for iOS 11.0. It is worked for me.
I put this code in didFinishLaunchingWithOptions method in AppDelegate file:
setenv("JSC_useJIT", "false", 0);
I hope this will help.
Find reference from Here

You appear to have exposed a bug with TimerBase in WebKit as reported here:
https://bugs.webkit.org/show_bug.cgi?id=182931
They mention a fix, which may have been picked up in the recently released 11.3.1.
You can see the fix here if you're curious.

Javascript core crash when using YouTube iframe player in UIWebView in iOS 11.3

We have an iOS app with a UIWebView that loads YouTube iframe player to play youtube videos. After iOS 11.3 released we found that there are a lot of javascript core crashes. On Fabric crashlytics the crash stcktrace looks like this
Crashed: WebThread
0 JavaScriptCore 0x18aa48298 JSC::JSLock::DropAllLocks::DropAllLocks(JSC::VM&) + 176
1 JavaScriptCore 0x18aa4826c JSC::JSLock::DropAllLocks::DropAllLocks(JSC::VM&) + 132
2 WebCore 0x18b78b794 SendDelegateMessage(NSInvocation*) + 360
3 WebKitLegacy 0x18cea7c68 CallDelegate(void (*)(), WebView*, objc_object*, objc_selector*, objc_object*, objc_object*, objc_object*) + 144
4 WebKitLegacy 0x18ce1b8d0 WebFrameLoaderClient::dispatchDidFailLoading(WebCore::DocumentLoader*, unsigned long, WebCore::ResourceError const&) + 276
5 WebCore 0x18b7ba660 WebCore::ResourceLoadNotifier::didFailToLoad(WebCore::ResourceLoader*, WebCore::ResourceError const&) + 128
6 WebCore 0x18b7ba118 WebCore::ResourceLoader::cancel(WebCore::ResourceError const&) + 464
7 WebCore 0x18b7b9ea4 WebCore::ResourceLoader::cancel() + 64
8 WebCore 0x18c6bbe90 WebCore::CachedResource::removeClient(WebCore::CachedResourceClient&) + 264
9 WebCore 0x18c680558 WebCore::MediaResource::~MediaResource() + 64
10 WebCore 0x18c680608 WebCore::MediaResource::~MediaResource() + 12
11 libobjc.A.dylib 0x1827daef4 object_cxxDestructFromClass(objc_object*, objc_class*) + 148
12 libobjc.A.dylib 0x1827e8990 objc_destructInstance + 68
13 libobjc.A.dylib 0x1827e89f8 object_dispose + 16
14 WebCore 0x18cbff8f0 -[WebCoreNSURLSessionDataTask dealloc] + 320
15 CoreFoundation 0x1834f24e4 -[__NSDictionaryM dealloc] + 164
16 AVFoundation 0x189130cf8 -[AVAssetCustomURLBridgeForNSURLSession dealloc] + 68
17 AVFoundation 0x18917ce54 -[AVAssetResourceLoader dealloc] + 356
18 AVFoundation 0x189060460 -[AVURLAsset dealloc] + 248
19 AVFoundation 0x189097c34 -[AVPlayerItemTrack dealloc] + 192
20 WebCore 0x18b8a9fac WebCore::AVTrackPrivateAVFObjCImpl::~AVTrackPrivateAVFObjCImpl() + 92
21 WebCore 0x18cbf09dc WebCore::VideoTrackPrivateAVFObjC::~VideoTrackPrivateAVFObjC() + 48
22 WebCore 0x18cbefc7c WebCore::VideoTrack::~VideoTrack() + 96
23 WebCore 0x18b982390 WebCore::TrackEvent::~TrackEvent() + 72
24 JavaScriptCore 0x18aa26228 void JSC::MarkedBlock::Handle::specializedSweep<true, (JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1, JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::MarkedBlock::Handle::EmptyMode, JSC::MarkedBlock::Handle::SweepMode, JSC::MarkedBlock::Handle::SweepDestructionMode, JSC::MarkedBlock::Handle::ScribbleMode, JSC::MarkedBlock::Handle::NewlyAllocatedMode, JSC::MarkedBlock::Handle::MarksMode, JSC::JSDestructibleObjectDestroyFunc const&) + 212
25 JavaScriptCore 0x18aa24950 void JSC::MarkedBlock::Handle::finishSweepKnowingHeapCellType<JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::JSDestructibleObjectDestroyFunc const&)::'lambda'()::operator()() const + 408
26 JavaScriptCore 0x18aa2444c void JSC::MarkedBlock::Handle::finishSweepKnowingHeapCellType<JSC::JSDestructibleObjectDestroyFunc>(JSC::FreeList*, JSC::JSDestructibleObjectDestroyFunc const&) + 320
27 JavaScriptCore 0x18aa24300 JSC::JSDestructibleObjectHeapCellType::finishSweep(JSC::MarkedBlock::Handle&, JSC::FreeList*) + 32
28 JavaScriptCore 0x18a7ac538 JSC::MarkedBlock::Handle::sweep(JSC::FreeList*) + 372
29 JavaScriptCore 0x18a7aa6fc JSC::LocalAllocator::tryAllocateIn(JSC::MarkedBlock::Handle*) + 40
30 JavaScriptCore 0x18a7aa608 JSC::LocalAllocator::tryAllocateWithoutCollecting() + 48
31 JavaScriptCore 0x18a7aa4c8 JSC::LocalAllocator::allocateSlowCase(JSC::GCDeferralContext*, JSC::AllocationFailureMode) + 292
32 JavaScriptCore 0x18a78f4b8 JSC::CompleteSubspace::allocateNonVirtual(JSC::VM&, unsigned long, JSC::GCDeferralContext*, JSC::AllocationFailureMode) + 216
33 WebCore 0x18c171e3c std::__1::enable_if<std::is_same<WebCore::Event, WebCore::Event>::value, WebCore::JSDOMWrapperConverterTraits<WebCore::Event>::WrapperClass*>::type WebCore::createWrapper<WebCore::Event, WebCore::Event>(WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::Event, WTF::DumbPtrTraits<WebCore::Event> >&&) + 216
34 WebCore 0x18c170be0 WebCore::toJSNewlyCreated(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::Event, WTF::DumbPtrTraits<WebCore::Event> >&&) + 100
35 WebCore 0x18c170444 WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) + 872
36 WebCore 0x18c3acbe0 WebCore::EventTarget::fireEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener, WTF::DumbPtrTraits<WebCore::RegisteredEventListener> >, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>) + 760
37 WebCore 0x18c3a8798 WebCore::EventTarget::fireEventListeners(WebCore::Event&) + 596
38 WebCore 0x18c3a8524 WebCore::EventContext::handleLocalEvents(WebCore::Event&) const + 120
39 WebCore 0x18c3a9a24 WebCore::dispatchEventInDOM(WebCore::Event&, WebCore::EventPath const&) + 164
40 WebCore 0x18c3a96e8 WebCore::EventDispatcher::dispatchEvent(WebCore::Node&, WebCore::Event&) + 700
41 WebCore 0x18b7cce50 WebCore::HTMLImageLoader::dispatchLoadEvent() + 248
42 WebCore 0x18b7ccd1c WebCore::ImageLoader::dispatchPendingEvent(WebCore::EventSender<WebCore::ImageLoader>*) + 144
43 WebCore 0x18b7ccb94 WebCore::EventSender<WebCore::ImageLoader>::dispatchPendingEvents() + 128
44 WebCore 0x18b743ff0 WebCore::ThreadTimers::sharedTimerFiredInternal() + 352
45 WebCore 0x18b743e7c WebCore::timerFired(__CFRunLoopTimer*, void*) + 28
46 CoreFoundation 0x1835cbaa8 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 28
47 CoreFoundation 0x1835cb76c __CFRunLoopDoTimer + 864
48 CoreFoundation 0x1835cb010 __CFRunLoopDoTimers + 248
49 CoreFoundation 0x1835c8b60 __CFRunLoopRun + 2168
50 CoreFoundation 0x1834e8da8 CFRunLoopRunSpecific + 552
51 WebCore 0x18b775dcc RunWebThread(void*) + 592
52 libsystem_pthread.dylib 0x183249220 _pthread_body + 272
53 libsystem_pthread.dylib 0x183249110 _pthread_body + 290
54 libsystem_pthread.dylib 0x183247b10 thread_start + 4## Heading ##
Any ideas? Is this a YouTube iframe player issue or UIWebView issue?
Thanks.

ios - webthread- java script core crash

getting lots of crashes as below in ios11: any idea what could be reason behind it. its happening in ios11 only. webkit framework is included in project.
Crashed: WebThread
0 JavaScriptCore 0x18d513a2c bmalloc::Heap::allocateLarge(std::__1::lock_guard<bmalloc::StaticMutex>&, unsigned long, unsigned long) + 24
1 JavaScriptCore 0x18d513a20 bmalloc::Heap::allocateLarge(std::__1::lock_guard<bmalloc::StaticMutex>&, unsigned long, unsigned long) + 12
2 JavaScriptCore 0x18d5112a0 bmalloc::Allocator::allocateLarge(unsigned long) + 92
3 JavaScriptCore 0x18cb6bef4 WTF::fastMalloc(unsigned long) + 112
4 JavaScriptCore 0x18d11e6a8 JSC::Heap::addExecutable(JSC::ExecutableBase*) + 352
5 JavaScriptCore 0x18d10a288 JSC::FunctionExecutable::finishCreation(JSC::VM&) + 48
6 JavaScriptCore 0x18d44f7cc JSC::UnlinkedFunctionExecutable::link(JSC::VM&, JSC::SourceCode const&, std::optional<int>, JSC::Intrinsic) + 280
7 JavaScriptCore 0x18d207860 JSC::functionPrototypeApplyCodeGenerator(JSC::VM&) + 64
8 JavaScriptCore 0x18d10d81c JSC::FunctionPrototype::addFunctionProperties(JSC::ExecState*, JSC::JSGlobalObject*, JSC::JSFunction**, JSC::JSFunction**, JSC::JSFunction**) + 156
9 JavaScriptCore 0x18d21a9f8 JSC::JSGlobalObject::init(JSC::VM&) + 1300
10 JavaScriptCore 0x18d224898 JSC::JSGlobalObject::finishCreation(JSC::VM&, JSC::JSObject*) + 144
11 WebCore 0x18e015590 WebCore::JSDOMGlobalObject::finishCreation(JSC::VM&, JSC::JSObject*) + 24
12 WebCore 0x18e850840 WebCore::JSDOMWindowBase::finishCreation(JSC::VM&, WebCore::JSDOMWindowProxy*) + 44
13 WebCore 0x18e7d28ac WebCore::JSDOMWindow::finishCreation(JSC::VM&, WebCore::JSDOMWindowProxy*) + 36
14 WebCore 0x18e8548a4 WebCore::JSDOMWindowProxy::setWindow(WTF::RefPtr<WebCore::DOMWindow>&&) + 516
15 WebCore 0x18eed505c WebCore::ScriptController::setDOMWindowForWindowProxy(WebCore::DOMWindow*) + 360
16 WebCore 0x18dfed904 WebCore::FrameLoader::clear(WebCore::Document*, bool, bool, bool) + 476
17 WebCore 0x18e3a42c8 WebCore::DocumentWriter::begin(WebCore::URL const&, bool, WebCore::Document*) + 368
18 WebCore 0x18dfebb58 WebCore::DocumentLoader::commitData(char const*, unsigned long) + 176
19 WebKitLegacy 0x18f3d3bd8 -[WebHTMLRepresentation receivedData:withDataSource:] + 112
20 WebKitLegacy 0x18f3d3af8 -[WebDataSource(WebInternal) _receivedData:] + 68
21 WebKitLegacy 0x18f3d3a98 WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int) + 112
22 WebCore 0x18e0099c4 WebCore::DocumentLoader::commitLoad(char const*, int) + 172
23 WebCore 0x18e008bec WebCore::DocumentLoader::continueAfterContentPolicy(WebCore::PolicyAction) + 1796
24 WebCore 0x18e3930a0 WebCore::DocumentLoader::responseReceived(WebCore::ResourceResponse const&) + 1820
25 WebCore 0x18e392004 WebCore::DocumentLoader::handleSubstituteDataLoadNow() + 308
26 WebCore 0x18dfaf000 WebCore::ThreadTimers::sharedTimerFiredInternal() + 172
27 WebCore 0x18dfaef40 WebCore::timerFired(__CFRunLoopTimer*, void*) + 28
28 CoreFoundation 0x186152fc0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 28
29 CoreFoundation 0x186152ce4 __CFRunLoopDoTimer + 864
30 CoreFoundation 0x1861524e4 __CFRunLoopDoTimers + 248
31 CoreFoundation 0x1861500cc __CFRunLoopRun + 1928
32 CoreFoundation 0x18606fe58 CFRunLoopRunSpecific + 436
33 WebCore 0x18dfe0a34 RunWebThread(void*) + 560
34 libsystem_pthread.dylib 0x185dd02b4 _pthread_body + 308
35 libsystem_pthread.dylib 0x185dd0180 _pthread_body + 310
36 libsystem_pthread.dylib 0x185dceb74 thread_start + 4

is this an actual crash or virtual crash for ios ? and what could be reason behind this crash?

0
Crashed: WebThread
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000000000001
libGPUSupportMercury.dylib gpus_ReturnNotPermittedKillClient
1 AGXGLDriver (null)
2 libGPUSupportMercury.dylib gpusSubmitDataBuffers
3AGXGLDriver (null)
4 WebCore WebCore::GraphicsContext3D::reshape(int, int) + 528
5 WebCore WebCore::WebGLRenderingContextBase::initializeNewContext() + 716
6 WebCore
WebCore::WebGLRenderingContextBase::WebGLRenderingContextBase(WebCore::HTMLCanvasElement&, WTF::RefPtr<WebCore::GraphicsContext3D>&&, WebCore::GraphicsContext3DAttributes) + 544
7 WebCore
WebCore::WebGLRenderingContext::WebGLRenderingContext(WebCore::HTMLCanvasElement&, WTF::PassRefPtr<WebCore::GraphicsContext3D>, WebCore::GraphicsContext3DAttributes) + 60
8 WebCore
WebCore::WebGLRenderingContextBase::create(WebCore::HTMLCanvasElement&, WebCore::GraphicsContext3DAttributes&, WTF::String const&) + 1176
9 WebCore
WebCore::HTMLCanvasElement::getContextWebGL(WTF::String const&, WebCore::GraphicsContext3DAttributes&&) + 156
10 WebCore
WebCore::JSHTMLCanvasElement::getContext(JSC::ExecState&) + 360
11 WebCore
WebCore::jsHTMLCanvasElementPrototypeFunctionGetContext(JSC::ExecState*) + 172
12 JavaScriptCore
llint_entry + 28916
13 JavaScriptCore
llint_entry + 26408
14 JavaScriptCore
llint_entry + 26408
15 JavaScriptCore
llint_entry + 26408
16 JavaScriptCore
llint_entry + 26408
17 JavaScriptCore
llint_entry + 26408
18 JavaScriptCore
llint_entry + 26408
19 JavaScriptCore
llint_entry + 26408
20 JavaScriptCore
llint_entry + 26408
21 JavaScriptCore
vmEntryToJavaScript + 264
22 JavaScriptCore
JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) + 164
23 JavaScriptCore
JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 416
24 JavaScriptCore
JSC::boundFunctionCall(JSC::ExecState*) + 552
25 JavaScriptCore
llint_entry + 28916
26 JavaScriptCore
llint_entry + 26408
27 JavaScriptCore
vmEntryToJavaScript + 264
28 JavaScriptCore
JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) + 164
29 JavaScriptCore
JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 416
30 JavaScriptCore
JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 164
31 JavaScriptCore
JSC::JSJobMicrotask::run(JSC::ExecState*) + 436
32 WebCore
WebCore::JSDOMWindowMicrotaskCallback::call() + 152
33 WebCore
WebCore::ActiveDOMCallbackMicrotask::run() + 48
34 WebCore
WebCore::MicrotaskQueue::performMicrotaskCheckpoint() + 100
35 WebCore
WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld&, WebCore::ExceptionDetails*) + 352
36 WebCore
WebCore::ScriptElement::executeClassicScript(WebCore::ScriptSourceCode const&) + 548
37 WebCore
WebCore::LoadableClassicScript::execute(WebCore::ScriptElement&) + 52
38 WebCore
WebCore::ScriptElement::executeScriptAndDispatchEvent(WebCore::LoadableScript&) + 216
39 WebCore
WebCore::ScriptRunner::timerFired() + 504
40 WebCore
WebCore::ThreadTimers::sharedTimerFiredInternal() + 172
41 WebCore
WebCore::timerFired(__CFRunLoopTimer*, void*) + 28
42 CoreFoundation
__CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 28
43 CoreFoundation
__CFRunLoopDoTimer + 856
44 CoreFoundation
__CFRunLoopDoTimers + 244
45 CoreFoundation
__CFRunLoopRun + 1484
46 CoreFoundation
CFRunLoopRunSpecific + 424
47 WebCore
RunWebThread(void*) + 456
48 libsystem_pthread.dylib
_pthread_body + 240
49 libsystem_pthread.dylib
_pthread_body + 282
50
libsystem_pthread.dylib
thread_start + 4

That's a crash. If you want further help please provide the code that caused this error.

iOS 7 Web Core issus loadPendingImages

I have this crash log, but I don't understand how to find what causes an issue.
Thread : Crashed: WebThread
0 WebCore 954995104 WebCore::StyleResolver::loadPendingImages() + 1135
1 WebCore 955192507 WebCore::ResourceRequestBase::~ResourceRequestBase() + 106
2 WebCore 954966933 WebCore::StyleResolver::applyMatchedProperties(WebCore::StyleResolver::MatchResult const&, WebCore::Element const*) + 792
3 WebCore 955009301 WebCore::StyleResolver::styleForElement(WebCore::Element*, WebCore::RenderStyle*, WebCore::StyleSharingBehavior, WebCore::RuleMatchingBehavior, WebCore::RenderRegion*) + 952
4 WebCore 956072077 WebCore::Document::styleForElementIgnoringPendingStylesheets(WebCore::Element*) + 96
5 WebCore 956071899 WebCore::Element::computedStyle(WebCore::PseudoId) + 142
6 WebCore 956433467 WebCore::ComputedStyleExtractor::propertyValue(WebCore::CSSPropertyID, WebCore::EUpdateLayout) const + 466
7 WebCore 957126027 WebCore::CSSComputedStyleDeclaration::getPropertyValue(WebCore::CSSPropertyID) const + 42
8 WebCore 957125931 WebCore::CSSComputedStyleDeclaration::getPropertyValue(WTF::String const&) + 26
9 WebCore 957459107 WebCore::jsCSSStyleDeclarationPrototypeFunctionGetPropertyValue(JSC::ExecState*) + 258
10 JavaScriptCore 838902235 llint_native_call_trampoline + 64
11 JavaScriptCore 838939999 JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 70
12 WebCore 955098071 WebCore::JSMainThreadExecState::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 146
13 WebCore 957106929 WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext*, WebCore::Event*) + 520
14 WebCore 956836797 WebCore::EventTarget::fireEventListeners(WebCore::Event*, WebCore::EventTargetData*, WTF::Vector<WebCore::RegisteredEventListener, 1ul, WTF::CrashOnOverflow>&) + 484
15 WebCore 955783727 WebCore::EventTarget::fireEventListeners(WebCore::Event*) + 178
16 WebCore 955784069 WebCore::EventContext::handleLocalEvents(WebCore::Event*) const + 60
17 WebCore 955783067 WebCore::EventDispatcher::dispatch() + 546
18 WebCore 955782519 WebCore::EventDispatchMediator::dispatchEvent(WebCore::EventDispatcher*) const + 10
19 WebCore 955780731 WebCore::EventDispatcher::dispatchEvent(WebCore::Node*, WTF::PassRefPtr<WebCore::EventDispatchMediator>) + 154
20 WebCore 955780413 WebCore::Node::dispatchEvent(WTF::PassRefPtr<WebCore::Event>) + 100
21 WebCore 955830855 WebCore::Document::finishedParsing() + 102
22 WebCore 955791991 WebCore::HTMLDocumentParser::prepareToStopParsing() + 122
23 WebCore 956118393 WebCore::HTMLDocumentParser::notifyFinished(WebCore::CachedResource*) + 68
24 WebCore 956102527 WebCore::CachedResource::checkNotify() + 42
25 WebCore 956102065 WebCore::SubresourceLoader::didFinishLoading(double) + 112
26 WebCore 956101909 WebCore::didFinishLoading(_CFURLConnection*, void const*) + 132
27 CFNetwork 818745231 ___ZN27URLConnectionClient_Classic26_delegate_didFinishLoadingEU13block_pointerFvvE_block_invoke + 74
28 CFNetwork 818740111 ___ZN27URLConnectionClient_Classic18_withDelegateAsyncEPKcU13block_pointerFvP16_CFURLConnectionPK33CFURLConnectionClientCurrent_VMaxE_block_invoke_2 + 54
29 CFNetwork 818942775 ___ZNK17CoreSchedulingSet13_performAsyncEPKcU13block_pointerFvvE_block_invoke + 18
30 CoreFoundation 821665441 CFArrayApplyFunction + 36
31 CFNetwork 818314757 RunloopBlockContext::perform() + 164
32 CFNetwork 818314453 MultiplexerSource::perform() + 220
33 CFNetwork 818314085 MultiplexerSource::_perform(void*) + 48
34 CoreFoundation 822288159 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14
35 CoreFoundation 822285287 __CFRunLoopDoSources0 + 206
36 CoreFoundation 822279127 __CFRunLoopRun + 630
37 CoreFoundation 821666929 CFRunLoopRunSpecific + 524
38 CoreFoundation 821666387 CFRunLoopRunInMode + 106
39 WebCore 955674821 RunWebThread(void*) + 420
40 libsystem_pthread.dylib 1000184925 _pthread_body + 140
41 libsystem_pthread.dylib 1000184783 _pthread_start + 102
42 libsystem_pthread.dylib 1000176848 thread_start + 8

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