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Hi!There is a weird crash what I cant reproduce. 5% of or our users (20-30 crash/day) have this random crash. So I want to fix it. But I have no idea what I should do with it. Reports come from only iOS 12Here is the stacktrace from Instabug. Do you have an idea what can cause this crash?data:text/text;charset=utf-8, # Cause: Crash due to signal: SIGSEGV(SEGV_MAPERR) at 00000058 # Reported at: 2018-12-13 20:07:40 UTC Thread 0: 0 libsystem_kernel.dylib 0x198af7ea4 thread_self_trap + 0 1 CoreFoundation 0x198efcbe8 __CFRunLoopServiceMachPort + 272 2 CoreFoundation 0x198ef7a84 __CFRunLoopRun + 1432 3 CoreFoundation 0x198ef71f0 CFRunLoopRunSpecific + 472 4 GraphicsServices 0x19b170584 GSEventRunModal + 100 5 UIKitCore 0x1c613b4c0 -[UIApplication _targetInChainForAction:sender:] + 244 6 vimage 0x10422879c main (main.m:14) 7 libdyld.dylib 0x1989b6bb4 start + 4 Thread 1: 0 libsystem_kernel.dylib 0x198af7ea4 thread_self_trap + 0 1 CoreFoundation 0x198efcbe8 __CFRunLoopServiceMachPort + 272 2 CoreFoundation 0x198ef7a84 __CFRunLoopRun + 1432 3 CoreFoundation 0x198ef71f0 CFRunLoopRunSpecific + 472 4 Foundation 0x1998ed494 -[NSUserDefaults(NSUserDefaults) boolForKey:] + 48 5 Foundation 0x1998ed340 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 104 6 UIKitCore 0x1c622b384 -[_UIPencilPreferences dealloc] + 128 7 Foundation 0x199a2023c __NSThread__start__ + 1184 8 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 9 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 10 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 2: 0 libsystem_kernel.dylib 0x198b03b9c __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x198b8bcec start_wqthread + 4 Thread 3: 0 libsystem_kernel.dylib 0x198af7ea4 thread_self_trap + 0 1 vimage 0x10428def8 CLSMachExceptionServer (CLSMachException.c:180) 2 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 3 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 4 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 4: 0 libsystem_kernel.dylib 0x198b02f0c __psynch_cvwait + 8 1 libc++.1.dylib 0x1980d04d0 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 24 2 JavaScriptCore 0x1a02ae9c8 void std::__1::condition_variable_any::wait<std::__1::unique_lock >(std::__1::unique_lock&) + 120 3 JavaScriptCore 0x1a02b2abc bmalloc::Scavenger::threadRunLoop() + 192 4 JavaScriptCore 0x1a02b21f0 bmalloc::Scavenger::scheduleIfUnderMemoryPressure(unsigned long) + 0 5 JavaScriptCore 0x1a02b3c9c bmalloc::Vector::shrinkCapacity() + 8 6 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 7 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 8 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 5: 0 libsystem_kernel.dylib 0x198af7ea4 thread_self_trap + 0 1 CoreFoundation 0x198efcbe8 __CFRunLoopServiceMachPort + 272 2 CoreFoundation 0x198ef7a84 __CFRunLoopRun + 1432 3 CoreFoundation 0x198ef71f0 CFRunLoopRunSpecific + 472 4 WebCore 0x1a1d66eec WebCore::constructJSKeyframeEffect1(JSC::ExecState*) + 836 5 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 6 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 7 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 6: 0 libsystem_kernel.dylib 0x198af7ea4 thread_self_trap + 0 1 CoreFoundation 0x198efcbe8 __CFRunLoopServiceMachPort + 272 2 CoreFoundation 0x198ef7a84 __CFRunLoopRun + 1432 3 CoreFoundation 0x198ef71f0 CFRunLoopRunSpecific + 472 4 CoreFoundation 0x198ef7f8c CFRunLoopRun + 116 5 CoreMotion 0x19e94dc58 0x00000001868b5c58 + 1152 6 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 7 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 8 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 7: 0 libsystem_kernel.dylib 0x198af7fc4 syscall_thread_switch + 8 1 libdispatch.dylib 0x198988cd8 _dispatch_root_queue_drain + 836 2 libdispatch.dylib 0x19898934c _dispatch_worker_thread2 + 100 3 libsystem_pthread.dylib 0x198b8917c _pthread_wqthread + 472 4 libsystem_pthread.dylib 0x198b8bcec start_wqthread + 4 Thread 8: 0 Instabug 0x1050216e8 mach_exception_callback + 168 1 Instabug 0x10502d208 exception_server_thread + 264 2 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 3 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 4 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 9: 0 libsystem_kernel.dylib 0x198b03b9c __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x198b8bcec start_wqthread + 4 Thread 10: 0 libsystem_kernel.dylib 0x198af7ea4 thread_self_trap + 0 1 CoreFoundation 0x198efcbe8 __CFRunLoopServiceMachPort + 272 2 CoreFoundation 0x198ef7a84 __CFRunLoopRun + 1432 3 CoreFoundation 0x198ef71f0 CFRunLoopRunSpecific + 472 4 CFNetwork 0x19951a00c -[__NSCFLocalSessionTask _onqueue_completeInitialization] + 88 5 Foundation 0x199a2023c __NSThread__start__ + 1184 6 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 7 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 8 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 11: 0 libsystem_kernel.dylib 0x198af7ea4 thread_self_trap + 0 1 CoreFoundation 0x198efcbe8 __CFRunLoopServiceMachPort + 272 2 CoreFoundation 0x198ef7a84 __CFRunLoopRun + 1432 3 CoreFoundation 0x198ef71f0 CFRunLoopRunSpecific + 472 4 Foundation 0x1998ed494 -[NSUserDefaults(NSUserDefaults) boolForKey:] + 48 5 vimage 0x104366d28 -[_FSRRunLoopThread main] (FSRWebSocket.m:1839) 6 Foundation 0x199a2023c __NSThread__start__ + 1184 7 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 8 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 9 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 12: 0 libsystem_kernel.dylib 0x198b03350 __select + 8 1 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 2 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 3 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 13: 0 libsystem_kernel.dylib 0x198b02f0c __psynch_cvwait + 8 1 JavaScriptCore 0x1a029cb14 ***::ThreadCondition::timedWait(***::Mutex&, ***::WallTime) + 96 2 JavaScriptCore 0x1a0283d20 ***::ParkingLot::parkConditionallyImpl(void const*, ***::ScopedLambda const&, ***::ScopedLambda const&, ***::TimeWithDynamicClockType const&) + 2020 3 WebKitLegacy 0x1a31ec180 bool ***::Condition::waitUntil(***::Lock&, ***::TimeWithDynamicClockType const&) + 148 4 WebKitLegacy 0x1a31eee24 std::__1::unique_ptr<***::function, std::__1::default_delete<***::function > > ***::MessageQueue<***::function >::waitForMessageFilteredWithTimeout<***::messagequeue<***::function >::waitForMessage()::'lambda'(***::Function const&)>(***::MessageQueueWaitResult&, ***::MessageQueue<***::function >::waitForMessage()::'lambda'(***::Function const&)&&, ***::WallTime) + 156 5 WebKitLegacy 0x1a31ee43c WebCore::StorageThread::threadEntryPoint() + 68 6 JavaScriptCore 0x1a029ad70 ***::Thread::entryPoint(***::Thread::NewThreadContext*) + 272 7 JavaScriptCore 0x1a029c2d8 ***::Thread::initializeCurrentThreadInternal(char const*) + 4 8 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 9 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 10 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 14: 0 libsystem_kernel.dylib 0x198af7ea4 thread_self_trap + 0 1 CoreFoundation 0x198efcbe8 __CFRunLoopServiceMachPort + 272 2 CoreFoundation 0x198ef7a84 __CFRunLoopRun + 1432 3 CoreFoundation 0x198ef71f0 CFRunLoopRunSpecific + 472 4 AVFAudio 0x19ef0a60c GenericRunLoopThread::Entry(void*) + 164 5 AVFAudio 0x19ef36768 CAPThread::Entry(CAPThread*) + 88 6 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 7 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 8 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 15: 0 libsystem_kernel.dylib 0x198af7ee0 semaphore_signal_trap + 0 1 libdispatch.dylib 0x1989755d4 _dispatch_semaphore_wait_slow + 112 2 AFNetworking 0x104b37200 -[AFURLSessionManager tasksForKeyPath:] (AFURLSessionManager.m:665) 3 AFNetworking 0x104b37698 -[AFURLSessionManager downloadTasks] (AFURLSessionManager.m:681) 4 vimage 0x1041dea8c -[FirebaseClient downloadEffectsFrom:to:] (FirebaseClient.m:593) 5 vimage 0x1041dc644 __38-[FirebaseClient download:completion:]_block_invoke_2 (FirebaseClient.m:251) 6 libdispatch.dylib 0x1989a56c8 _dispatch_call_block_and_release + 24 7 libdispatch.dylib 0x1989a6484 _dispatch_client_callout + 16 8 libdispatch.dylib 0x19897ca6c _dispatch_queue_override_invoke + 664 9 libdispatch.dylib 0x198988aec _dispatch_root_queue_drain + 328 10 libdispatch.dylib 0x19898934c _dispatch_worker_thread2 + 100 11 libsystem_pthread.dylib 0x198b8917c _pthread_wqthread + 472 12 libsystem_pthread.dylib 0x198b8bcec start_wqthread + 4 Thread 16: 0 libsystem_kernel.dylib 0x198b03b9c __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x198b8bcec start_wqthread + 4 Thread 17: 0 libsystem_kernel.dylib 0x198af7ef8 semaphore_signal_thread_trap + 0 1 libdispatch.dylib 0x19897559c _dispatch_semaphore_wait_slow + 56 2 libdispatch.dylib 0x1989888dc _dispatch_worker_thread + 328 3 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 4 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 5 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 18: 0 libsystem_kernel.dylib 0x198af7ef8 semaphore_signal_thread_trap + 0 1 libdispatch.dylib 0x19897559c _dispatch_semaphore_wait_slow + 56 2 libdispatch.dylib 0x1989888dc _dispatch_worker_thread + 328 3 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 4 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 5 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 19: 0 libsystem_kernel.dylib 0x198b03b9c __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x198b8bcec start_wqthread + 4 Thread 20 [Crashed]: 0 libdispatch.dylib 0x19898b5b8 dispatch_source_set_timer$VARIANT$armv81 + 40 1 CFNetwork 0x1996b2b14 ___ZN27URLConnectionLoader_Classic19protocolDidLoadDataEPK8__CFDatax_block_invoke + 32 2 CFNetwork 0x1996b23e0 URLConnectionLoader::_private_ScheduleOriginLoad(NSURLRequest const*, _CFCachedURLResponse const*) + 380 3 CFNetwork 0x1996b2908 non-virtual thunk to URLConnectionLoader_Classic::protocolWasRedirected(NSURLRequest const*, _CFURLResponse*) + 4 4 CFNetwork 0x1996b0728 URLConnectionLoader::_onqueue_loaderEvent_CancelLoad(std::__1::shared_ptr, URLProtocol*) + 248 5 CFNetwork 0x199785b5c MultiplexerSource::signal(CoreSchedulingSet const*, MultiplexerClient*) + 116 6 libdispatch.dylib 0x1989a56c8 _dispatch_call_block_and_release + 24 7 libdispatch.dylib 0x1989a6484 _dispatch_client_callout + 16 8 libdispatch.dylib 0x198980fa0 _dispatch_lane_serial_drain$VARIANT$armv81 + 532 9 libdispatch.dylib 0x198981b1c _dispatch_lane_invoke$VARIANT$armv81 + 468 10 libdispatch.dylib 0x198982d60 _dispatch_workloop_invoke$VARIANT$armv81 + 1892 11 libdispatch.dylib 0x198989f04 _dispatch_workloop_worker_thread + 568 12 libsystem_pthread.dylib 0x198b890dc _pthread_wqthread + 312 13 libsystem_pthread.dylib 0x198b8bcec start_wqthread + 4 Thread 21: 0 libsystem_kernel.dylib 0x198b03b9c __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x198b8bcec start_wqthread + 4 Thread 22: 0 libsystem_kernel.dylib 0x198af7ee0 semaphore_signal_trap + 0 1 libdispatch.dylib 0x1989755d4 _dispatch_semaphore_wait_slow + 112 2 AFNetworking 0x104b37200 -[AFURLSessionManager tasksForKeyPath:] (AFURLSessionManager.m:665) 3 AFNetworking 0x104b37698 -[AFURLSessionManager downloadTasks] (AFURLSessionManager.m:681) 4 vimage 0x1041dbc0c -[FirebaseClient downloadArtistList] (FirebaseClient.m:0) 5 vimage 0x1041db52c __34-[FirebaseClient downloadArtists:]_block_invoke_2 (FirebaseClient.m:98) 6 libdispatch.dylib 0x1989a56c8 _dispatch_call_block_and_release + 24 7 libdispatch.dylib 0x1989a6484 _dispatch_client_callout + 16 8 libdispatch.dylib 0x19897ca6c _dispatch_queue_override_invoke + 664 9 libdispatch.dylib 0x198988aec _dispatch_root_queue_drain + 328 10 libdispatch.dylib 0x19898934c _dispatch_worker_thread2 + 100 11 libsystem_pthread.dylib 0x198b8917c _pthread_wqthread + 472 12 libsystem_pthread.dylib 0x198b8bcec start_wqthread + 4 Thread 23: 0 libsystem_kernel.dylib 0x198b03b9c __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x198b8bcec start_wqthread + 4 Thread 24: 0 libsystem_kernel.dylib 0x198af7ea4 thread_self_trap + 0 1 CoreFoundation 0x198efcbe8 __CFRunLoopServiceMachPort + 272 2 CoreFoundation 0x198ef7a84 __CFRunLoopRun + 1432 3 CoreFoundation 0x198ef71f0 CFRunLoopRunSpecific + 472 4 CFNetwork 0x19951a00c -[__NSCFLocalSessionTask _onqueue_completeInitialization] + 88 5 Foundation 0x199a2023c __NSThread__start__ + 1184 6 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 7 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 8 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 25: 0 libsystem_kernel.dylib 0x198af7ef8 semaphore_signal_thread_trap + 0 1 libdispatch.dylib 0x19897559c _dispatch_semaphore_wait_slow + 56 2 libdispatch.dylib 0x1989888dc _dispatch_worker_thread + 328 3 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 4 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 5 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 26: 0 libsystem_kernel.dylib 0x198b03b9c __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x198b8bcec start_wqthread + 4 Thread 27: 0 libsystem_kernel.dylib 0x198b03b9c __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x198b8bcec start_wqthread + 4 Thread 28: Thread 29: 0 libsystem_kernel.dylib 0x198b02f0c __psynch_cvwait + 8 1 JavaScriptCore 0x1a029cb58 ***::ThreadCondition::timedWait(***::Mutex&, ***::WallTime) + 164 2 JavaScriptCore 0x1a0283d20 ***::ParkingLot::parkConditionallyImpl(void const*, ***::ScopedLambda const&, ***::ScopedLambda const&, ***::TimeWithDynamicClockType const&) + 2020 3 JavaScriptCore 0x1a025d664 bool ***::Condition::waitUntil(***::Lock&, ***::TimeWithDynamicClockType const&) + 200 4 JavaScriptCore 0x1a025da04 ***::Function::CallableWrapper<***::automaticthread::start(***::abstractlocker const&)::$_0="">::call() + 232 5 JavaScriptCore 0x1a029ad70 ***::Thread::entryPoint(***::Thread::NewThreadContext*) + 272 6 JavaScriptCore 0x1a029c2d8 ***::Thread::initializeCurrentThreadInternal(char const*) + 4 7 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 8 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 9 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 30: 0 libsystem_kernel.dylib 0x198b02f0c __psynch_cvwait + 8 1 JavaScriptCore 0x1a029cb58 ***::ThreadCondition::timedWait(***::Mutex&, ***::WallTime) + 164 2 JavaScriptCore 0x1a0283d20 ***::ParkingLot::parkConditionallyImpl(void const*, ***::ScopedLambda const&, ***::ScopedLambda const&, ***::TimeWithDynamicClockType const&) + 2020 3 JavaScriptCore 0x1a025d664 bool ***::Condition::waitUntil(***::Lock&, ***::TimeWithDynamicClockType const&) + 200 4 JavaScriptCore 0x1a025da04 ***::Function::CallableWrapper<***::automaticthread::start(***::abstractlocker const&)::$_0="">::call() + 232 5 JavaScriptCore 0x1a029ad70 ***::Thread::entryPoint(***::Thread::NewThreadContext*) + 272 6 JavaScriptCore 0x1a029c2d8 ***::Thread::initializeCurrentThreadInternal(char const*) + 4 7 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 8 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 9 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 31: 0 libsystem_kernel.dylib 0x198b02f0c __psynch_cvwait + 8 1 JavaScriptCore 0x1a029cb58 ***::ThreadCondition::timedWait(***::Mutex&, ***::WallTime) + 164 2 JavaScriptCore 0x1a0283d20 ***::ParkingLot::parkConditionallyImpl(void const*, ***::ScopedLambda const&, ***::ScopedLambda const&, ***::TimeWithDynamicClockType const&) + 2020 3 JavaScriptCore 0x1a025d664 bool ***::Condition::waitUntil(***::Lock&, ***::TimeWithDynamicClockType const&) + 200 4 JavaScriptCore 0x1a025da04 ***::Function::CallableWrapper<***::automaticthread::start(***::abstractlocker const&)::$_0="">::call() + 232 5 JavaScriptCore 0x1a029ad70 ***::Thread::entryPoint(***::Thread::NewThreadContext*) + 272 6 JavaScriptCore 0x1a029c2d8 ***::Thread::initializeCurrentThreadInternal(char const*) + 4 7 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 8 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 9 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 32: 0 libsystem_kernel.dylib 0x198b02f0c __psynch_cvwait + 8 1 JavaScriptCore 0x1a029cb58 ***::ThreadCondition::timedWait(***::Mutex&, ***::WallTime) + 164 2 JavaScriptCore 0x1a0283d20 ***::ParkingLot::parkConditionallyImpl(void const*, ***::ScopedLambda const&, ***::ScopedLambda const&, ***::TimeWithDynamicClockType const&) + 2020 3 JavaScriptCore 0x1a025d664 bool ***::Condition::waitUntil(***::Lock&, ***::TimeWithDynamicClockType const&) + 200 4 JavaScriptCore 0x1a025da04 ***::Function::CallableWrapper<***::automaticthread::start(***::abstractlocker const&)::$_0="">::call() + 232 5 JavaScriptCore 0x1a029ad70 ***::Thread::entryPoint(***::Thread::NewThreadContext*) + 272 6 JavaScriptCore 0x1a029c2d8 ***::Thread::initializeCurrentThreadInternal(char const*) + 4 7 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 8 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 9 libsystem_pthread.dylib 0x198b8bcf4 thread_start + 4 Thread 33: 0 libsystem_kernel.dylib 0x198b02f0c __psynch_cvwait + 8 1 JavaScriptCore 0x1a029cb58 ***::ThreadCondition::timedWait(***::Mutex&, ***::WallTime) + 164 2 JavaScriptCore 0x1a0283d20 ***::ParkingLot::parkConditionallyImpl(void const*, ***::ScopedLambda const&, ***::ScopedLambda const&, ***::TimeWithDynamicClockType const&) + 2020 3 JavaScriptCore 0x1a025d664 bool ***::Condition::waitUntil(***::Lock&, ***::TimeWithDynamicClockType const&) + 200 4 JavaScriptCore 0x1a025da04 ***::Function::CallableWrapper<***::automaticthread::start(***::abstractlocker const&)::$_0="">::call() + 232 5 JavaScriptCore 0x1a029ad70 ***::Thread::entryPoint(***::Thread::NewThreadContext*) + 272 6 JavaScriptCore 0x1a029c2d8 ***::Thread::initializeCurrentThreadInternal(char const*) + 4 7 libsystem_pthread.dylib 0x198b8825c _pthread_body + 48 8 libsystem_pthread.dylib 0x198b881bc _pthread_joiner_wake + 80 9 libsystem_pthread.dylib 0x198b8bcf4 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