我随机收到以下异常，这会使我的SDK和应用程序崩溃。为了解决这个问题，我无法找到原因。
我添加了一个主线程检查器断点，但仍然无法找到以下崩溃的原因。主要问题是应用程序是旧版SDK，其代码正在更新或修改散布在不同实例中的UI。
我已尝试获取线程回溯，以查找有关该错误的更多信息。但是堆栈跟踪不会指向源代码中使用的任何类。
我的例外
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Modifications to the layout engine must not be performed from a background thread after it has been accessed from the main thread.'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff23e39f0e __exceptionPreprocess + 350
1 libobjc.A.dylib 0x00007fff50ad79b2 objc_exception_throw + 48
2 Foundation 0x00007fff25a90175 -[NSISEngine tryToOptimizeReturningMutuallyExclusiveConstraints] + 0
3 Foundation 0x00007fff25a8fd63 -[NSISEngine _optimizeWithoutRebuilding] + 54
4 Foundation 0x00007fff25a8fc96 -[NSISEngine optimize] + 100
5 Foundation 0x00007fff25a8a9b8 -[NSISEngine performPendingChangeNotifications] + 82
6 UIKitCore 0x00007fff490c9cd4 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 3642
7 QuartzCore 0x00007fff2b4ae3f0 -[CALayer layoutSublayers] + 255
8 UIKitCore 0x00007fff49023efb -[_UILabelLayer layoutSublayers] + 55
9 QuartzCore 0x00007fff2b4b457b _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 523
10 QuartzCore 0x00007fff2b4bfc12 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 80
11 QuartzCore 0x00007fff2b408c84 _ZN2CA7Context18commit_transactionEPNS_11TransactionEd + 324
12 QuartzCore 0x00007fff2b43c65f _ZN2CA11Transaction6commitEv + 649
13 QuartzCore 0x00007fff2b43d55a _ZN2CA11Transaction14release_threadEPv + 210
14 libsystem_pthread.dylib 0x00007fff51b39054 _pthread_tsd_cleanup + 551
15 libsystem_pthread.dylib 0x00007fff51b3b512 _pthread_exit + 70
16 libsystem_pthread.dylib 0x00007fff51b38ddd _pthread_wqthread_exit + 77
StackTrace
* thread #213, stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
* frame #0: 0x00007fff51a1fc34 libsystem_c.dylib`__abort + 169
frame #1: 0x00007fff51a1fb8b libsystem_c.dylib`abort + 135
frame #2: 0x00007fff4f927858 libc++abi.dylib`abort_message + 231
frame #3: 0x00007fff4f918cbf libc++abi.dylib`demangling_terminate_handler() + 262
frame #4: 0x00007fff50ad7c0b libobjc.A.dylib`_objc_terminate() + 96
frame #5: 0x00007fff4f926c87 libc++abi.dylib`std::__terminate(void (*)()) + 8
frame #6: 0x00007fff4f92940b libc++abi.dylib`__cxxabiv1::failed_throw(__cxxabiv1::__cxa_exception*) + 27
frame #7: 0x00007fff4f9293d2 libc++abi.dylib`__cxa_throw + 113
frame #8: 0x00007fff50ad7ad6 libobjc.A.dylib`objc_exception_throw + 340
frame #9: 0x00007fff25a90175 Foundation`_AssertAutolayoutOnAllowedThreadsOnly + 428
frame #10: 0x00007fff25a8fd63 Foundation`-[NSISEngine _optimizeWithoutRebuilding] + 54
frame #11: 0x00007fff25a8fc96 Foundation`-[NSISEngine optimize] + 100
frame #12: 0x00007fff25a8a9b8 Foundation`-[NSISEngine performPendingChangeNotifications] + 82
frame #13: 0x00007fff490c9cd4 UIKitCore`-[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 3642
frame #14: 0x00007fff2b4ae3f0 QuartzCore`-[CALayer layoutSublayers] + 255
frame #15: 0x00007fff49023efb UIKitCore`-[_UILabelLayer layoutSublayers] + 55
frame #16: 0x00007fff2b4b457b QuartzCore`CA::Layer::layout_if_needed(CA::Transaction*) + 523
frame #17: 0x00007fff2b4bfc12 QuartzCore`CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 80
frame #18: 0x00007fff2b408c84 QuartzCore`CA::Context::commit_transaction(CA::Transaction*, double) + 324
frame #19: 0x00007fff2b43c65f QuartzCore`CA::Transaction::commit() + 649
frame #20: 0x00007fff2b43d55a QuartzCore`CA::Transaction::release_thread(void*) + 210
frame #21: 0x00007fff51b39054 libsystem_pthread.dylib`_pthread_tsd_cleanup + 551
frame #22: 0x00007fff51b3b512 libsystem_pthread.dylib`_pthread_exit + 70
frame #23: 0x00007fff51b38ddd libsystem_pthread.dylib`_pthread_wqthread_exit + 77
frame #24: 0x00007fff51b37afc libsystem_pthread.dylib`_pthread_wqthread + 481
frame #25: 0x00007fff51b36b77 libsystem_pthread.dylib`start_wqthread + 15
详细堆栈跟踪
thread #1, queue = 'com.apple.main-thread'
frame #0: 0x00007fff51a89dfa libsystem_kernel.dylib`mach_msg_trap + 10
frame #1: 0x00007fff51a8a170 libsystem_kernel.dylib`mach_msg + 60
frame #2: 0x00007fff23d9d715 CoreFoundation`__CFRunLoopServiceMachPort + 165
frame #3: 0x00007fff23d98347 CoreFoundation`__CFRunLoopRun + 1383
frame #4: 0x00007fff23d97ac4 CoreFoundation`CFRunLoopRunSpecific + 404
frame #5: 0x00007fff38b2fc1a GraphicsServices`GSEventRunModal + 139
frame #6: 0x00007fff48bc7f80 UIKitCore`UIApplicationMain + 1605
frame #7: 0x00000001087ff470 VMAX`main(argc=1, argv=0x00007ffee746cca0) at main.m:14:20
frame #8: 0x00007fff519521fd libdyld.dylib`start + 1
thread #5, name = 'com.apple.uikit.eventfetch-thread'
frame #0: 0x00007fff51a89dfa libsystem_kernel.dylib`mach_msg_trap + 10
frame #1: 0x00007fff51a8a170 libsystem_kernel.dylib`mach_msg + 60
frame #2: 0x00007fff23d9d715 CoreFoundation`__CFRunLoopServiceMachPort + 165
frame #3: 0x00007fff23d98347 CoreFoundation`__CFRunLoopRun + 1383
frame #4: 0x00007fff23d97ac4 CoreFoundation`CFRunLoopRunSpecific + 404
frame #5: 0x00007fff25924d71 Foundation`-[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 211
frame #6: 0x00007fff25924fe0 Foundation`-[NSRunLoop(NSRunLoop) runUntilDate:] + 72
frame #7: 0x00007fff48c74db7 UIKitCore`-[UIEventFetcher threadMain] + 138
frame #8: 0x00007fff2593aaeb Foundation`__NSThread__start__ + 1047
frame #9: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #10: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #9, name = 'com.apple.NSURLConnectionLoader'
frame #0: 0x00007fff51a89dfa libsystem_kernel.dylib`mach_msg_trap + 10
frame #1: 0x00007fff51a8a170 libsystem_kernel.dylib`mach_msg + 60
frame #2: 0x00007fff23d9d715 CoreFoundation`__CFRunLoopServiceMachPort + 165
frame #3: 0x00007fff23d98347 CoreFoundation`__CFRunLoopRun + 1383
frame #4: 0x00007fff23d97ac4 CoreFoundation`CFRunLoopRunSpecific + 404
frame #5: 0x00007fff23158c93 CFNetwork`___lldb_unnamed_symbol11344$$CFNetwork + 182
frame #6: 0x00007fff2593aaeb Foundation`__NSThread__start__ + 1047
frame #7: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #8: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #15, name = 'WebThread'
frame #0: 0x00007fff51a89dfa libsystem_kernel.dylib`mach_msg_trap + 10
frame #1: 0x00007fff51a8a170 libsystem_kernel.dylib`mach_msg + 60
frame #2: 0x00007fff23d9d715 CoreFoundation`__CFRunLoopServiceMachPort + 165
frame #3: 0x00007fff23d98347 CoreFoundation`__CFRunLoopRun + 1383
frame #4: 0x00007fff23d97ac4 CoreFoundation`CFRunLoopRunSpecific + 404
frame #5: 0x00007fff4bac7955 WebCore`RunWebThread(void*) + 565
frame #6: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #7: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #24, name = 'com.apple.audio.IOThread.client'
frame #0: 0x00007fff51a89dfa libsystem_kernel.dylib`mach_msg_trap + 10
frame #1: 0x00007fff51a8a170 libsystem_kernel.dylib`mach_msg + 60
frame #2: 0x00007fff238f0363 CoreAudio`___ZN19HALC_ProxyIOContextC2Ejj_block_invoke + 3146
frame #3: 0x00007fff2390ce8c CoreAudio`HALB_IOThread::Entry(void*) + 72
frame #4: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #5: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #26, name = 'com.apple.coreaudio.AQClient'
frame #0: 0x00007fff51a89dfa libsystem_kernel.dylib`mach_msg_trap + 10
frame #1: 0x00007fff51a8a170 libsystem_kernel.dylib`mach_msg + 60
frame #2: 0x00007fff23d9d715 CoreFoundation`__CFRunLoopServiceMachPort + 165
frame #3: 0x00007fff23d98347 CoreFoundation`__CFRunLoopRun + 1383
frame #4: 0x00007fff23d97ac4 CoreFoundation`CFRunLoopRunSpecific + 404
frame #5: 0x00007fff22802b96 AudioToolbox`GenericRunLoopThread::Entry(void*) + 166
frame #6: 0x00007fff4e2e26dd libAudioToolboxUtility.dylib`CAPThread::Entry(CAPThread*) + 77
frame #7: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #8: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #27
frame #0: 0x00007fff51a89e36 libsystem_kernel.dylib`semaphore_wait_trap + 10
frame #1: 0x00007fff4d8e5d48 caulk`caulk::mach::semaphore::wait() + 16
frame #2: 0x00007fff4d8e12f2 caulk`caulk::semaphore::timed_wait(double) + 106
frame #3: 0x00007fff4d8e49d4 caulk`caulk::concurrent::details::worker_thread::run() + 30
frame #4: 0x00007fff4d8e4b24 caulk`void* caulk::thread_proxy<std::__1::tuple<caulk::thread::attributes, void (caulk::concurrent::details::worker_thread::*)(), std::__1::tuple<caulk::concurrent::details::worker_thread*> > >(void*) + 45
frame #5: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #6: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #28, name = 'AMCP Logging Spool'
frame #0: 0x00007fff51a89e36 libsystem_kernel.dylib`semaphore_wait_trap + 10
frame #1: 0x00007fff4d8e5d48 caulk`caulk::mach::semaphore::wait() + 16
frame #2: 0x00007fff4d8e12f2 caulk`caulk::semaphore::timed_wait(double) + 106
frame #3: 0x00007fff4d8e49d4 caulk`caulk::concurrent::details::worker_thread::run() + 30
frame #4: 0x00007fff4d8e4b24 caulk`void* caulk::thread_proxy<std::__1::tuple<caulk::thread::attributes, void (caulk::concurrent::details::worker_thread::*)(), std::__1::tuple<caulk::concurrent::details::worker_thread*> > >(void*) + 45
frame #5: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #6: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #56
frame #0: 0x00007fff51a8b4ce libsystem_kernel.dylib`__workq_kernreturn + 10
frame #1: 0x00007fff51b37aa1 libsystem_pthread.dylib`_pthread_wqthread + 390
frame #2: 0x00007fff51b36b77 libsystem_pthread.dylib`start_wqthread + 15
* thread #65, stop reason = breakpoint 1.1 2.1 5.1
* frame #0: 0x00007fff50ad7982 libobjc.A.dylib`objc_exception_throw
frame #1: 0x00007fff25a90175 Foundation`_AssertAutolayoutOnAllowedThreadsOnly + 428
frame #2: 0x00007fff25a8fd63 Foundation`-[NSISEngine _optimizeWithoutRebuilding] + 54
frame #3: 0x00007fff25a8fc96 Foundation`-[NSISEngine optimize] + 100
frame #4: 0x00007fff25a8a9b8 Foundation`-[NSISEngine performPendingChangeNotifications] + 82
frame #5: 0x00007fff490c9cd4 UIKitCore`-[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 3642
frame #6: 0x00007fff2b4ae3f0 QuartzCore`-[CALayer layoutSublayers] + 255
frame #7: 0x00007fff49023efb UIKitCore`-[_UILabelLayer layoutSublayers] + 55
frame #8: 0x00007fff2b4b457b QuartzCore`CA::Layer::layout_if_needed(CA::Transaction*) + 523
frame #9: 0x00007fff2b4bfc12 QuartzCore`CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 80
frame #10: 0x00007fff2b408c84 QuartzCore`CA::Context::commit_transaction(CA::Transaction*, double) + 324
frame #11: 0x00007fff2b43c65f QuartzCore`CA::Transaction::commit() + 649
frame #12: 0x00007fff2b43d55a QuartzCore`CA::Transaction::release_thread(void*) + 210
frame #13: 0x00007fff51b39054 libsystem_pthread.dylib`_pthread_tsd_cleanup + 551
frame #14: 0x00007fff51b3b512 libsystem_pthread.dylib`_pthread_exit + 70
frame #15: 0x00007fff51b38ddd libsystem_pthread.dylib`_pthread_wqthread_exit + 77
frame #16: 0x00007fff51b37afc libsystem_pthread.dylib`_pthread_wqthread + 481
frame #17: 0x00007fff51b36b77 libsystem_pthread.dylib`start_wqthread + 15
thread #78
frame #0: 0x00007fff51a8b4ce libsystem_kernel.dylib`__workq_kernreturn + 10
frame #1: 0x00007fff51b37aa1 libsystem_pthread.dylib`_pthread_wqthread + 390
frame #2: 0x00007fff51b36b77 libsystem_pthread.dylib`start_wqthread + 15
thread #83
frame #0: 0x00007fff51a89e4e libsystem_kernel.dylib`semaphore_timedwait_trap + 10
frame #1: 0x000000010afd7507 libdispatch.dylib`_dispatch_sema4_timedwait + 76
frame #2: 0x000000010afd7960 libdispatch.dylib`_dispatch_semaphore_wait_slow + 58
frame #3: 0x000000010afe81bc libdispatch.dylib`_dispatch_worker_thread + 326
frame #4: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #5: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #84
frame #0: 0x00007fff51a89e4e libsystem_kernel.dylib`semaphore_timedwait_trap + 10
frame #1: 0x000000010afd7507 libdispatch.dylib`_dispatch_sema4_timedwait + 76
frame #2: 0x000000010afd7960 libdispatch.dylib`_dispatch_semaphore_wait_slow + 58
frame #3: 0x000000010afe81bc libdispatch.dylib`_dispatch_worker_thread + 326
frame #4: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #5: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #86
frame #0: 0x00007fff51a8b4ce libsystem_kernel.dylib`__workq_kernreturn + 10
frame #1: 0x00007fff51b37aa1 libsystem_pthread.dylib`_pthread_wqthread + 390
frame #2: 0x00007fff51b36b77 libsystem_pthread.dylib`start_wqthread + 15
thread #87
frame #0: 0x00007fff51b36b68 libsystem_pthread.dylib`start_wqthread
thread #88
frame #0: 0x00007fff51a89e4e libsystem_kernel.dylib`semaphore_timedwait_trap + 10
frame #1: 0x000000010afd7507 libdispatch.dylib`_dispatch_sema4_timedwait + 76
frame #2: 0x000000010afd7960 libdispatch.dylib`_dispatch_semaphore_wait_slow + 58
frame #3: 0x000000010afe81bc libdispatch.dylib`_dispatch_worker_thread + 326
frame #4: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #5: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #89
frame #0: 0x00007fff51a8b4ce libsystem_kernel.dylib`__workq_kernreturn + 10
frame #1: 0x00007fff51b37aa1 libsystem_pthread.dylib`_pthread_wqthread + 390
frame #2: 0x00007fff51b36b77 libsystem_pthread.dylib`start_wqthread + 15
thread #90
frame #0: 0x00007fff51a89e4e libsystem_kernel.dylib`semaphore_timedwait_trap + 10
frame #1: 0x000000010afd7507 libdispatch.dylib`_dispatch_sema4_timedwait + 76
frame #2: 0x000000010afd7960 libdispatch.dylib`_dispatch_semaphore_wait_slow + 58
frame #3: 0x000000010afe81bc libdispatch.dylib`_dispatch_worker_thread + 326
frame #4: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #5: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #91
frame #0: 0x00007fff51a89e4e libsystem_kernel.dylib`semaphore_timedwait_trap + 10
frame #1: 0x000000010afd7507 libdispatch.dylib`_dispatch_sema4_timedwait + 76
frame #2: 0x000000010afd7960 libdispatch.dylib`_dispatch_semaphore_wait_slow + 58
frame #3: 0x000000010afe81bc libdispatch.dylib`_dispatch_worker_thread + 326
frame #4: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #5: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #92
frame #0: 0x00007fff51a89e4e libsystem_kernel.dylib`semaphore_timedwait_trap + 10
frame #1: 0x000000010afd7507 libdispatch.dylib`_dispatch_sema4_timedwait + 76
frame #2: 0x000000010afd7960 libdispatch.dylib`_dispatch_semaphore_wait_slow + 58
frame #3: 0x000000010afe81bc libdispatch.dylib`_dispatch_worker_thread + 326
frame #4: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #5: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #93, name = 'Heap Helper Thread'
frame #0: 0x00007fff51a8c882 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #1: 0x00007fff51b3b425 libsystem_pthread.dylib`_pthread_cond_wait + 698
frame #2: 0x00007fff26a7fc8a JavaScriptCore`WTF::ThreadCondition::timedWait(WTF::Mutex&, WTF::WallTime) + 122
frame #3: 0x00007fff26a62112 JavaScriptCore`WTF::ParkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&) + 2226
frame #4: 0x00007fff26a37935 JavaScriptCore`bool WTF::Condition::waitUntil<WTF::Lock>(WTF::Lock&, WTF::TimeWithDynamicClockType const&) + 165
frame #5: 0x00007fff26a37c4a JavaScriptCore`WTF::Detail::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0, void>::call() + 186
frame #6: 0x00007fff26a7d076 JavaScriptCore`WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) + 166
frame #7: 0x00007fff26a7f5c9 JavaScriptCore`WTF::wtfThreadEntryPoint(void*) + 9
frame #8: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #9: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #94, name = 'Heap Helper Thread'
frame #0: 0x00007fff51a8c882 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #1: 0x00007fff51b3b425 libsystem_pthread.dylib`_pthread_cond_wait + 698
frame #2: 0x00007fff26a7fc8a JavaScriptCore`WTF::ThreadCondition::timedWait(WTF::Mutex&, WTF::WallTime) + 122
frame #3: 0x00007fff26a62112 JavaScriptCore`WTF::ParkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&) + 2226
frame #4: 0x00007fff26a37935 JavaScriptCore`bool WTF::Condition::waitUntil<WTF::Lock>(WTF::Lock&, WTF::TimeWithDynamicClockType const&) + 165
frame #5: 0x00007fff26a37c4a JavaScriptCore`WTF::Detail::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0, void>::call() + 186
frame #6: 0x00007fff26a7d076 JavaScriptCore`WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) + 166
frame #7: 0x00007fff26a7f5c9 JavaScriptCore`WTF::wtfThreadEntryPoint(void*) + 9
frame #8: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #9: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #95
frame #0: 0x00007fff51a8b4ce libsystem_kernel.dylib`__workq_kernreturn + 10
frame #1: 0x00007fff51b37aa1 libsystem_pthread.dylib`_pthread_wqthread + 390
frame #2: 0x00007fff51b36b77 libsystem_pthread.dylib`start_wqthread + 15
thread #96, name = 'com.apple.coremedia.audioqueue.source'
frame #0: 0x00007fff51a8c882 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #1: 0x00007fff51b3b425 libsystem_pthread.dylib`_pthread_cond_wait + 698
frame #2: 0x00007fff24de75ce CoreMedia`WaitOnCondition + 11
frame #3: 0x00007fff24de72c1 CoreMedia`FigSemaphoreWaitRelative + 145
frame #4: 0x00007fff27dc2419 MediaToolbox`faq_enqueueSourceDataThread + 28
frame #5: 0x00007fff24de7e6a CoreMedia`figThreadMain + 276
frame #6: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #7: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15
thread #97, name = 'com.apple.coremedia.audiomentor'
frame #0: 0x00007fff51a8c882 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #1: 0x00007fff51b3b425 libsystem_pthread.dylib`_pthread_cond_wait + 698
frame #2: 0x00007fff24de75ce CoreMedia`WaitOnCondition + 11
frame #3: 0x00007fff24de72c1 CoreMedia`FigSemaphoreWaitRelative + 145
frame #4: 0x00007fff27e8621a MediaToolbox`audioMentorThread + 4109
frame #5: 0x00007fff24de7e6a CoreMedia`figThreadMain + 276
frame #6: 0x00007fff51b3b109 libsystem_pthread.dylib`_pthread_start + 148
frame #7: 0x00007fff51b36b8b libsystem_pthread.dylib`thread_start + 15