FileAccessor::Close() crash

Unity Engine
,
1

Hi,

We’re noting a high number of - what it seems to be - crashes on exit (100% crashes are when the app is in the background and we see that on the main thread applicationWillTerminate is called) from:
VirtualFileSystem.cpp line 902
FileAccessor::Close()

full stack trace:

Crashed: AsyncReadManager
0  kickerinhoWorld                0x170050bf0 (Missing)
1  kickerinhoWorld                0x100cdb12c FileAccessor::Close() (VirtualFileSystem.cpp:902)
2  kickerinhoWorld                0x100ce6440 ArchiveStorageReader::MakeStorageUnused() (dynamic_array.h:304)
3  kickerinhoWorld                0x100ce0974 ArchiveReadFile::Close() (ArchiveReadFile.cpp:25)
4  kickerinhoWorld                0x100ce092c ArchiveReadFile::~ArchiveReadFile() (ArchiveReadFile.cpp:18)
5  kickerinhoWorld                0x100cddcd4 ArchiveFileSystem::Close(FileEntryData&) (MemoryMacros.h:164)
6  kickerinhoWorld                0x100cdb12c FileAccessor::Close() (VirtualFileSystem.cpp:902)
7  kickerinhoWorld                0x100cedff0 File::Close() (FileVFS.cpp:398)
8  kickerinhoWorld                0x100cfcdb0 OpenFileCache::ForceClose(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (string:1664)
9  kickerinhoWorld                0x100cfc46c AsyncReadManagerThreaded::ThreadEntry() (AsyncReadManagerThreaded.cpp:106)
10 kickerinhoWorld                0x100cfc220 AsyncReadManagerThreaded::StaticThreadEntry(void*) (AsyncReadManagerThreaded.cpp:57)
11 kickerinhoWorld                0x100cd8dc4 Thread::RunThreadWrapper(void*) (Thread.cpp:44)
12 libsystem_pthread.dylib        0x18091c850 _pthread_body + 240
13 libsystem_pthread.dylib        0x18091c760 _pthread_body + 282
14 libsystem_pthread.dylib        0x180919dac thread_start + 4

Anyone run into similar issue? Maybe a unity dev could take a look at it (the crash log gives points to a specific line in the VirtualFileSystem.cpp source file).

2

Hey @drolak1 ,
Do you have the full crash log? Could you file a bug report please? :slight_smile:
Cheers,
Chris

3

Sorry for the delay I thought I had email notifications turned on for this thread, but looks like not.

I’m attaching the crashes here - I’ve added two others that look very similar.
As for the bug report - is it ok if I submit it without a repro? This is something that’s happening on production and is quite random - though it’s happening to almost 10% of the users.

2888142–212240–crashes_on_exit.zip (664 KB)

4

Hey @drolak1 ,
Not having a repro will make it harder for us to narrow down the the issue. If you could spend the time to create a reproduction project it would make the chances of this getting fixed quickly skyrocket.
Cheers,
Chris

5

Ok, I’ll see if we can come up with something. In the meantime maybe you could please take a look at VirtualFileSystem.cpp line 902?
All of those crashes point to that source file.

6

Any solution for this?

7

Any update on this yet? I also have a lot of crashes like this. Unfortunately, I can’t create a reproduction project for this, but every time the app is killed while still on the foreground it produces this crash.

8

@christophergoy : I don’t have a repro case but in production I am also getting lots of crashes with the same stack trace.

Stack trace

Native StackTrace:

Thread 0 (crashed)
0 bloodandhonorlite 0x0000000101678818 FileAccessor::Close() (VirtualFileSystem.cpp:996)
1 bloodandhonorlite 0x00000001018631d4 ArchiveStorageReader::MakeStorageUnused() (dynamic_array.h:580)
2 bloodandhonorlite 0x0000000101864a9c ArchiveReadFile::Close() (ArchiveReadFile.cpp:26)
3 bloodandhonorlite 0x0000000101864a50 ArchiveReadFile::~ArchiveReadFile() (ArchiveReadFile.cpp:19)
4 bloodandhonorlite 0x0000000101863a14 ArchiveFileSystem::Close(FileEntryData&) (MemoryMacros.h:186)
5 bloodandhonorlite 0x000000010185ee08 File::Close() (FileVFS.cpp:473)
6 bloodandhonorlite 0x0000000101733798 OpenFileCache::ForceCloseAll() (String.h:379)
7 bloodandhonorlite 0x0000000101733990 OpenFileCache::~OpenFileCache() (OpenFileCache.cpp:0)
8 bloodandhonorlite 0x0000000101732eb0 AsyncReadManagerThreaded::~AsyncReadManagerThreaded() (Semaphore.h:26)
9 bloodandhonorlite 0x000000010173386c CleanupAsyncReadManager() (MemoryMacros.h:186)
10 bloodandhonorlite 0x0000000101809848 PlayerCleanup(bool) (Player.cpp:581)
11 bloodandhonorlite 0x0000000101abe720 UnityCleanup (LibEntryPoint.mm:232)
12 bloodandhonorlite 0x0000000100ee1bdc -[UnityAppController applicationWillTerminate:] (UnityAppController.mm:453)
13 UIKitCore 0x0000000240fa3ef4 -[UIApplication _terminateWithStatus:]
14 UIKitCore 0x000000024085fd7c __98-[__UICanvasLifecycleMonitor_Compatability deactivateEventsOnly:withContext:forceExit:completion:]_block_invoke.261
15 UIKitCore 0x0000000240fa80ac _runAfterCACommitDeferredBlocks
16 UIKitCore 0x0000000240f96bfc _cleanUpAfterCAFlushAndRunDeferredBlocks
17 UIKitCore 0x0000000240fc3a6c _afterCACommitHandler
18 CoreFoundation 0x00000002147404fc
19 CoreFoundation 0x000000021473b224
20 CoreFoundation 0x000000021473b7a0
21 CoreFoundation 0x000000021473afb4
22 GraphicsServices 0x000000021693c79c GSEventRunModal
23 UIKitCore 0x0000000240f9cc38 UIApplicationMain
24 bloodandhonorlite 0x0000000100ecba7c main (main.mm:40)
25 libdyld.dylib 0x00000002141fe8e0 start

Thread 1
0 libsystem_kernel.dylib 0x000000021434aee4 __psynch_cvwait
1 libc++.1.dylib 0x0000000213921090 std::__1::condition_variable::wait(std::__1::unique_lockstd::__1::mutex&)
2 JavaScriptCore 0x000000021b9cfde0 void std::__1::condition_variable_any::wait<std::__1::unique_lockbmalloc::Mutex >(std::__1::unique_lockbmalloc::Mutex&)
3 JavaScriptCore 0x000000021b9d3dd4 bmalloc::Scavenger::threadRunLoop()
4 JavaScriptCore 0x000000021b9d354c bmalloc::Scavenger::Scavenger(std::__1::lock_guardbmalloc::Mutex&)
5 JavaScriptCore 0x000000021b9d4f8c std::__1::__thread_specific_ptrstd::__1::__thread_struct::set_pointer(std::__1::__thread_struct*)
6 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
7 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
8 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 2
0 libsystem_kernel.dylib 0x00000002143400f4 mach_msg_trap
1 CoreFoundation 0x0000000214740914
2 CoreFoundation 0x000000021473b824
3 CoreFoundation 0x000000021473afb4
4 Foundation 0x000000021510995c
5 Foundation 0x00000002151097ec
6 UIKitCore 0x0000000241082754 -[UIEventFetcher threadMain]
7 Foundation 0x00000002152364a0
8 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
9 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
10 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 3
0 libsystem_kernel.dylib 0x000000021434aee4 __psynch_cvwait
1 bloodandhonorlite 0x0000000101e89738 il2cpp::hushed:s::posix::posixWaitObject::Wait(unsigned int, bool) (PosixWaitObject.cpp:120)
2 bloodandhonorlite 0x0000000101e64004 il2cpp::gc::FinalizerThread(void*) (BoehmGC.cpp:330)
3 bloodandhonorlite 0x0000000101e80f60 il2cpp::hushed:s::thread::RunWrapper(void*) (Thread.cpp:176)
4 bloodandhonorlite 0x0000000101e832c4 il2cpp::hushed:s::ThreadImpl::ThreadStartWrapper(void*) (ThreadImpl.cpp:107)
5 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
6 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
7 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 4
0 libsystem_kernel.dylib 0x00000002143400f4 mach_msg_trap
1 CoreFoundation 0x0000000214740914
2 CoreFoundation 0x000000021473b824
3 CoreFoundation 0x000000021473afb4
4 AVFAudio 0x000000021a6ad334 GenericRunLoopThread::Entry(void*)
5 AVFAudio 0x000000021a6d7c60 CAPThread::Entry(CAPThread*)
6 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
7 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
8 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 5
0 libsystem_kernel.dylib 0x00000002143400f4 mach_msg_trap
1 CoreFoundation 0x0000000214740914
2 CoreFoundation 0x000000021473b824
3 CoreFoundation 0x000000021473afb4
4 CFNetwork 0x0000000214d5574c -[__CoreSchedulingSetRunnable runForever]
5 Foundation 0x00000002152364a0
6 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
7 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
8 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 6
0 libsystem_kernel.dylib 0x00000002143400f4 mach_msg_trap
1 CoreFoundation 0x0000000214740914
2 CoreFoundation 0x000000021473b824
3 CoreFoundation 0x000000021473afb4
4 CoreFoundation 0x000000021473bd10
5 CoreMotion 0x000000021a112be8
6 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
7 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
8 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 7
0 libsystem_kernel.dylib 0x000000021434aee4 __psynch_cvwait
1 bloodandhonorlite 0x0000000101e896d8 il2cpp::hushed:s::posix::posixWaitObject::Wait(unsigned int, bool) (PosixWaitObject.cpp:153)
2 bloodandhonorlite 0x0000000101e7f898 monitor_thread(void*) (ThreadPoolMonitorThread.cpp:158)
3 bloodandhonorlite 0x0000000101ea21ac il2cpp::vm::ThreadStart(void*) (Thread.cpp:717)
4 bloodandhonorlite 0x0000000101e80f60 il2cpp::hushed:s::thread::RunWrapper(void*) (Thread.cpp:176)
5 bloodandhonorlite 0x0000000101e832c4 il2cpp::hushed:s::ThreadImpl::ThreadStartWrapper(void*) (ThreadImpl.cpp:107)
6 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
7 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
8 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 8
0 libsystem_kernel.dylib 0x000000021434aee4 __psynch_cvwait
1 bloodandhonorlite 0x0000000101e889a4 il2cpp::hushed:s::ConditionVariableImpl::TimedWait(il2cpp::hushed:s::FastMutexImpl*, unsigned int) (ConditionVariableImpl.cpp:0)
2 bloodandhonorlite 0x0000000101e7fd00 worker_thread(void*) (ThreadPoolWorkerThread.cpp:88)
3 bloodandhonorlite 0x0000000101ea21ac il2cpp::vm::ThreadStart(void*) (Thread.cpp:717)
4 bloodandhonorlite 0x0000000101e80f60 il2cpp::hushed:s::thread::RunWrapper(void*) (Thread.cpp:176)
5 bloodandhonorlite 0x0000000101e832c4 il2cpp::hushed:s::ThreadImpl::ThreadStartWrapper(void*) (ThreadImpl.cpp:107)
6 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
7 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
8 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 9
0 libsystem_kernel.dylib 0x000000021434aee4 __psynch_cvwait
1 bloodandhonorlite 0x0000000101e889a4 il2cpp::hushed:s::ConditionVariableImpl::TimedWait(il2cpp::hushed:s::FastMutexImpl*, unsigned int) (ConditionVariableImpl.cpp:0)
2 bloodandhonorlite 0x0000000101e7fd00 worker_thread(void*) (ThreadPoolWorkerThread.cpp:88)
3 bloodandhonorlite 0x0000000101ea21ac il2cpp::vm::ThreadStart(void*) (Thread.cpp:717)
4 bloodandhonorlite 0x0000000101e80f60 il2cpp::hushed:s::thread::RunWrapper(void*) (Thread.cpp:176)
5 bloodandhonorlite 0x0000000101e832c4 il2cpp::hushed:s::ThreadImpl::ThreadStartWrapper(void*) (ThreadImpl.cpp:107)
6 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
7 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
8 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 10
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 11
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 12
0 libsystem_kernel.dylib 0x00000002143400f4 mach_msg_trap
1 bloodandhonorlite 0x00000001010cd30c FIRCLSMachExceptionServer (FIRCLSMachException.c:196)
2 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
3 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
4 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 13
0 libsystem_kernel.dylib 0x00000002143400f4 mach_msg_trap
1 CoreFoundation 0x0000000214740914
2 CoreFoundation 0x000000021473b824
3 CoreFoundation 0x000000021473afb4
4 Foundation 0x000000021510995c
5 Foundation 0x0000000215144e1c
6 bloodandhonorlite 0x00000001025d55c0 -[ALDebugThread main] (ALDebugThreadManager.m:200)
7 Foundation 0x00000002152364a0
8 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
9 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
10 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 14
0 libsystem_kernel.dylib 0x000000021434aee4 __psynch_cvwait
1 bloodandhonorlite 0x0000000101e896d8 il2cpp::hushed:s::posix::posixWaitObject::Wait(unsigned int, bool) (PosixWaitObject.cpp:153)
2 bloodandhonorlite 0x0000000101e78330 il2cpp::icalls::mscorlib::System::Threading::WaitHandle::Wait_internal(void**, int, bool, int) (WaitHandle.cpp:92)
3 bloodandhonorlite 0x0000000103b593dc WaitHandle_WaitOneNative_mC25327F2B99DBB404B62FD48CFCBDB3244F82434 (mscorlib21.cpp:0)
4 bloodandhonorlite 0x0000000103b592a4 WaitHandle_InternalWaitOne_m14CF12240D30C25A6C34683080C5A0D982786303 (mscorlib21.cpp:0)
5 bloodandhonorlite 0x0000000103b58940 Scheduler_SchedulerThread_m9D548ED1E24E29E6CB64A3C7F1FF42FA25054CF1 (mscorlib21.cpp:0)
6 bloodandhonorlite 0x0000000103b549d4 ThreadStart_Invoke_m11B6A66E82F02C74399A7314C14C7F52393CC4B4 (mscorlib21.cpp:32668)
7 bloodandhonorlite 0x0000000103b3ee34 ContextCallback_Invoke_m76E65E7A67AA99858554F451E0F78E22B6478998 (mscorlib20.cpp:31649)
8 bloodandhonorlite 0x0000000103b400fc ExecutionContext_RunInternal_m5BF955CE8B04D9A7C959B9011579CC0FABD5FC56 (mscorlib20.cpp:33024)
9 bloodandhonorlite 0x0000000103b549d4 ThreadStart_Invoke_m11B6A66E82F02C74399A7314C14C7F52393CC4B4 (mscorlib21.cpp:32668)
10 bloodandhonorlite 0x0000000100f7b3c0 RuntimeInvoker_TrueVoid_t22962CB4C05B1D89B55A6E1139F0E87A90987017(void ()(), MethodInfo const, void*, void**) (Il2CppInvokerTable.cpp:34357)
11 bloodandhonorlite 0x0000000101eaabdc il2cpp::vm::Runtime::Invoke(MethodInfo const*, void*, void**, Il2CppException**) (Runtime.cpp:550)
12 bloodandhonorlite 0x0000000101e77eec il2cpp::icalls::mscorlib::System::Threading::ThreadStart(void*) (Thread.cpp:159)
13 bloodandhonorlite 0x0000000101e80f60 il2cpp::hushed:s::thread::RunWrapper(void*) (Thread.cpp:176)
14 bloodandhonorlite 0x0000000101e832c4 il2cpp::hushed:s::ThreadImpl::ThreadStartWrapper(void*) (ThreadImpl.cpp:107)
15 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
16 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
17 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 15
0 libsystem_kernel.dylib 0x000000021434cfd8 poll
1 bloodandhonorlite 0x0000000101e85dc0 il2cpp::hushed:s::SocketImpl::poll(std::__1::vector<il2cpp::hushed:s::pollRequest, std::__1::allocatoril2cpp::hushed:s::pollRequest >&, int, int, int*, int*) (SocketImpl.cpp:2224)
2 bloodandhonorlite 0x0000000101e800d0 poll_event_wait(void ()(int, int, void), void*) (threadpool-ms-io-poll.cpp:158)
3 bloodandhonorlite 0x0000000101ebf360 selector_thread(void*) (threadpool-ms-io.cpp:452)
4 bloodandhonorlite 0x0000000101ea21ac il2cpp::vm::ThreadStart(void*) (Thread.cpp:717)
5 bloodandhonorlite 0x0000000101e80f60 il2cpp::hushed:s::thread::RunWrapper(void*) (Thread.cpp:176)
6 bloodandhonorlite 0x0000000101e832c4 il2cpp::hushed:s::ThreadImpl::ThreadStartWrapper(void*) (ThreadImpl.cpp:107)
7 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
8 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
9 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 16
0 libsystem_kernel.dylib 0x00000002143400f4 mach_msg_trap
1 CoreFoundation 0x0000000214740914
2 CoreFoundation 0x000000021473b824
3 CoreFoundation 0x000000021473afb4
4 Foundation 0x000000021510995c
5 bloodandhonorlite 0x0000000102413960 -[AdColony setupWorkerThread]
6 Foundation 0x00000002152364a0
7 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
8 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
9 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 17
0 libsystem_kernel.dylib 0x000000021434aee4 __psynch_cvwait
1 JavaScriptCore 0x000000021b9968cc WTF::ThreadCondition::timedWait(WTF::Mutex&, WTF::WallTime)
2 JavaScriptCore 0x000000021b97d514 WTF::parkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&)
3 JavaScriptCore 0x000000021b951358 bool WTF::Condition::waitUntilWTF::Lock(WTF::Lock&, WTF::TimeWithDynamicClockType const&)
4 JavaScriptCore 0x000000021b9516e8 WTF::Function<void ()>::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0>::call()
5 JavaScriptCore 0x000000021b994b30 WTF::thread::entryPoint(WTF::thread::NewThreadContext*)
6 JavaScriptCore 0x000000021b99603c WTF::wtfThreadEntryPoint(void*)
7 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
8 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
9 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 18
0 libsystem_kernel.dylib 0x000000021434aee4 __psynch_cvwait
1 bloodandhonorlite 0x0000000101e889a4 il2cpp::hushed:s::ConditionVariableImpl::TimedWait(il2cpp::hushed:s::FastMutexImpl*, unsigned int) (ConditionVariableImpl.cpp:0)
2 bloodandhonorlite 0x0000000101e7fd00 worker_thread(void*) (ThreadPoolWorkerThread.cpp:88)
3 bloodandhonorlite 0x0000000101ea21ac il2cpp::vm::ThreadStart(void*) (Thread.cpp:717)
4 bloodandhonorlite 0x0000000101e80f60 il2cpp::hushed:s::thread::RunWrapper(void*) (Thread.cpp:176)
5 bloodandhonorlite 0x0000000101e832c4 il2cpp::hushed:s::ThreadImpl::ThreadStartWrapper(void*) (ThreadImpl.cpp:107)
6 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
7 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
8 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 19
0 libsystem_kernel.dylib 0x000000021434aee4 __psynch_cvwait
1 JavaScriptCore 0x000000021b9968cc WTF::ThreadCondition::timedWait(WTF::Mutex&, WTF::WallTime)
2 JavaScriptCore 0x000000021b97d514 WTF::parkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&)
3 JavaScriptCore 0x000000021b951358 bool WTF::Condition::waitUntilWTF::Lock(WTF::Lock&, WTF::TimeWithDynamicClockType const&)
4 JavaScriptCore 0x000000021b9516e8 WTF::Function<void ()>::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0>::call()
5 JavaScriptCore 0x000000021b994b30 WTF::thread::entryPoint(WTF::thread::NewThreadContext*)
6 JavaScriptCore 0x000000021b99603c WTF::wtfThreadEntryPoint(void*)
7 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
8 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
9 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 20
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 21
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 22
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 23
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 24
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 25
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 26
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 27
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 28
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 29
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 30
0 libsystem_kernel.dylib 0x0000000214340148 semaphore_timedwait_trap
1 libdispatch.dylib 0x00000002141901dc _dispatch_semaphore_wait_slow
2 libdispatch.dylib 0x000000021419ddf8 _dispatch_worker_thread
3 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
4 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
5 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

Thread 31
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 32
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 33
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 34
0 libsystem_kernel.dylib 0x000000021434bb74 __workq_kernreturn
1 libsystem_pthread.dylib 0x00000002143d0cd4 start_wqthread

Thread 35
0 Unknown 0x0000000000000000

Thread 36
0 libsystem_kernel.dylib 0x0000000214340148 semaphore_timedwait_trap
1 libdispatch.dylib 0x00000002141901dc _dispatch_semaphore_wait_slow
2 libdispatch.dylib 0x000000021419ddf8 _dispatch_worker_thread
3 libsystem_pthread.dylib 0x00000002143cd2c0 _pthread_body
4 libsystem_pthread.dylib 0x00000002143cd220 _pthread_start
5 libsystem_pthread.dylib 0x00000002143d0cdc thread_start

9

@drolak1 : I think I have the answer looking at our code. We are trying to save to a file when “OnApplicationQuit” get called. Seems that on iOS that may block the main thread and cause the crash.