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From iOS 12.3 and above iOS versions we are getting AudioToolBox crashes, we do not know why these crashes are happening. We have Crashlytics Crash report but we are not able to debug the issue with the help of Crashlytics crash report.I have attached the Crashlytics crash report.Background of our application :Our application streams the video using RTSP url and VLC mobile kit. even when the application is sent to the background the streaming continues and the stream will try to reconnect when the stream disconnects due to some error.While streaming the video in the background we show the user a red bar on the user iPhone.We tried different scenarios to reproduce the issue some of them are1) we checked if it is happening when we receive a mobile call when the user is streaming2) We checked if interruptions from other streaming applications are causing the issue3) We checked if Siri or getting a face time call is creating the crashWe tried all the above mentioned in debugging, as well as release, buildsfind the crash report details belowJul 2019 11:18:45 GMT # Date: 2019-07-04T10:59:00Z # OS Version: 12.3.1 (16F203) # Device: iPhone 8 # RAM Free: 9.6% # Disk Free: 53.9% #22. Crashed: com.apple.coreaudio.auremoteio 0 AudioToolbox 0x18c489058 SampleRateConverter::SetProperty(unsigned int, unsigned int, void const*) + 192 1 AudioToolbox 0x18c669580 AudioConverterSetProperty + 96 2 AudioToolbox 0x18c51c638 AUConverterBase::SetupConverter(unsigned int, bool) + 1340 3 AudioToolbox 0x18c3fe948 AURemoteIO::SetupConverter(unsigned int, bool) + 224 4 AudioToolbox 0x18c51aed8 AUConverterBase::SetupAllConverters(bool, unsigned int) + 104 5 AudioToolbox 0x18c400a0c AURemoteIO::IOFormatsChanged(int) + 1420 6 AudioToolbox 0x18c402afc __AURIOCallbackReceiver_IOFormatsChanged_block_invoke + 96 7 libdispatch.dylib 0x187f80a38 _dispatch_call_block_and_release + 24 8 libdispatch.dylib 0x187f817d4 _dispatch_client_callout + 16 9 libdispatch.dylib 0x187f5cdec _dispatch_lane_serial_drain$VARIANT$armv81 + 548 10 libdispatch.dylib 0x187f5d92c _dispatch_lane_invoke$VARIANT$armv81 + 408 11 libdispatch.dylib 0x187f65e08 _dispatch_workloop_worker_thread + 584 12 libsystem_pthread.dylib 0x188161114 _pthread_wqthread + 304 13 libsystem_pthread.dylib 0x188163cd4 start_wqthread + 4 -- #0. com.apple.main-thread 0 AppName 0x101169978 _gnutls_ext_deinit + 417 (extensions.c:417) 1 AppName 0x10116f750 _gnutls_global_deinit + 416 (global.c:416) 2 (Missing) 0x1032313c0 (Missing) 3 (Missing) 0x10321a7b8 (Missing) 4 libsystem_c.dylib 0x188038bb4 __cxa_finalize_ranges + 384 5 libsystem_c.dylib 0x188038ec4 exit + 24 6 UIKitCore 0x1b4e4ed2c -[UIApplication terminateWithSuccess] + 466 7 UIKitCore 0x1b470adb4 __98-[__UICanvasLifecycleMonitor_Compatability deactivateEventsOnly:withContext:forceExit:completion:]_block_invoke.261 + 344 8 UIKitCore 0x1b4e52dec _runAfterCACommitDeferredBlocks + 296 9 UIKitCore 0x1b4e4193c _cleanUpAfterCAFlushAndRunDeferredBlocks + 352 10 UIKitCore 0x1b4e6e7ac _afterCACommitHandler + 116 11 CoreFoundation 0x1884d25f8 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32 12 CoreFoundation 0x1884cd320 __CFRunLoopDoObservers + 412 13 CoreFoundation 0x1884cd89c __CFRunLoopRun + 1228 14 CoreFoundation 0x1884cd0b0 CFRunLoopRunSpecific + 436 15 GraphicsServices 0x18a6cd79c GSEventRunModal + 104 16 UIKitCore 0x1b4e47978 UIApplicationMain + 212 17 AppName 0x1007fd1f4 main + 24 (AppDelegate.swift:24) 18 libdyld.dylib 0x187f928e0 start + 4 #1. com.apple.uikit.eventfetch-thread 0 libsystem_kernel.dylib 0x1880d30f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x1880d25a0 mach_msg + 72 2 CoreFoundation 0x1884d2a10 __CFRunLoopServiceMachPort + 236 3 CoreFoundation 0x1884cd920 __CFRunLoopRun + 1360 4 CoreFoundation 0x1884cd0b0 CFRunLoopRunSpecific + 436 5 Foundation 0x188e9afac -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 300 6 Foundation 0x188e9ae3c -[NSRunLoop(NSRunLoop) runUntilDate:] + 96 7 UIKitCore 0x1b4f2d494 -[UIEventFetcher threadMain] + 136 8 Foundation 0x188fc76a4 __NSThread__start__ + 984 9 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 10 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 11 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #2. GAIThread 0 libsystem_kernel.dylib 0x1880d30f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x1880d25a0 mach_msg + 72 2 CoreFoundation 0x1884d2a10 __CFRunLoopServiceMachPort + 236 3 CoreFoundation 0x1884cd920 __CFRunLoopRun + 1360 4 CoreFoundation 0x1884cd0b0 CFRunLoopRunSpecific + 436 5 Foundation 0x188e9afac -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 300 6 Foundation 0x188ed646c -[NSRunLoop(NSRunLoop) run] + 88 7 AppName 0x100bc9d14 +[GAI threadMain:] + 4345896212 8 Foundation 0x188fc76a4 __NSThread__start__ + 984 9 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 10 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 11 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #3. com.apple.CFSocket.private 0 libsystem_kernel.dylib 0x1880de328 __select + 8 1 CoreFoundation 0x1884db6f4 __CFSocketManager + 620 2 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 3 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 4 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #4. com.twitter.crashlytics.ios.MachExceptionServer 0 AppName 0x100aded58 CLSProcessRecordAllThreads + 4344933720 1 AppName 0x100adf140 CLSProcessRecordAllThreads + 4344934720 2 AppName 0x100ace9bc CLSHandler + 4344867260 3 AppName 0x100ac9d9c CLSMachExceptionServer + 4344847772 4 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 5 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 6 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #5. AVAudioSession Notify Thread 0 libsystem_kernel.dylib 0x1880d30f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x1880d25a0 mach_msg + 72 2 CoreFoundation 0x1884d2a10 __CFRunLoopServiceMachPort + 236 3 CoreFoundation 0x1884cd920 __CFRunLoopRun + 1360 4 CoreFoundation 0x1884cd0b0 CFRunLoopRunSpecific + 436 5 AVFAudio 0x18e3b5334 GenericRunLoopThread::Entry(void*) + 156 6 AVFAudio 0x18e3dfc60 CAPThread::Entry(CAPThread*) + 88 7 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 8 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 9 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #6. com.apple.NSURLConnectionLoader 0 libsystem_kernel.dylib 0x1880d30f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x1880d25a0 mach_msg + 72 2 CoreFoundation 0x1884d2a10 __CFRunLoopServiceMachPort + 236 3 CoreFoundation 0x1884cd920 __CFRunLoopRun + 1360 4 CoreFoundation 0x1884cd0b0 CFRunLoopRunSpecific + 436 5 CFNetwork 0x188ae674c -[__CoreSchedulingSetRunnable runForever] + 216 6 Foundation 0x188fc76a4 __NSThread__start__ + 984 7 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 8 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 9 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #7. Thread 0 libsystem_kernel.dylib 0x1880dffd8 poll + 8 1 CustomSDK 0x103661de8 _lws_plat_service_tsi + 236 2 CustomSDK 0x1036a3554 websocket_worker + 60 3 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 4 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 5 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #8. Thread 0 libsystem_kernel.dylib 0x1880de9d4 __ulock_wait + 8 1 libdispatch.dylib 0x187f50c20 _dispatch_ulock_wait + 56 2 libdispatch.dylib 0x187f50d58 _dispatch_thread_event_wait_slow$VARIANT$armv81 + 48 3 libdispatch.dylib 0x187f628a8 __DISPATCH_WAIT_FOR_QUEUE__ + 336 4 libdispatch.dylib 0x187f624a8 _dispatch_sync_f_slow + 140 5 AppName 0x100c397e0 -[VLCEventManager startEventLoop] + 220 (VLCEventManager.m:220) 6 AppName 0x100c3916c EventDispatcherMainLoop + 97 (VLCEventManager.m:97) 7 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 8 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 9 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #9. Thread 0 libsystem_kernel.dylib 0x1880d30f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x1880d25a0 mach_msg + 72 2 CoreFoundation 0x1884d2a10 __CFRunLoopServiceMachPort + 236 3 CoreFoundation 0x1884cd920 __CFRunLoopRun + 1360 4 CoreFoundation 0x1884cd0b0 CFRunLoopRunSpecific + 436 5 CustomSDK 0x103634e60 -[P2PCamera worker] + 88 6 Foundation 0x188fc76a4 __NSThread__start__ + 984 7 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 8 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 9 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #10. Thread 0 libsystem_kernel.dylib 0x1880de328 __select + 8 1 CustomSDK 0x103776534 pj_sock_select + 84 2 CustomSDK 0x103772340 pj_ioqueue_poll + 196 3 CustomSDK 0x103699bc4 _pjice_worker_thread + 172 4 CustomSDK 0x10377329c thread_main + 84 5 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 6 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 7 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #11. Thread 0 libsystem_kernel.dylib 0x1880de328 __select + 8 1 CustomSDK 0x103776534 pj_sock_select + 84 2 CustomSDK 0x103772340 pj_ioqueue_poll + 196 3 CustomSDK 0x103699bc4 _pjice_worker_thread + 172 4 CustomSDK 0x10377329c thread_main + 84 5 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 6 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 7 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #12. Thread 0 libsystem_kernel.dylib 0x1880de328 __select + 8 1 CustomSDK 0x103776534 pj_sock_select + 84 2 CustomSDK 0x103772340 pj_ioqueue_poll + 196 3 CustomSDK 0x103699bc4 _pjice_worker_thread + 172 4 CustomSDK 0x10377329c thread_main + 84 5 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 6 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 7 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #13. Thread 0 libsystem_kernel.dylib 0x1880de400 __semwait_signal + 8 1 libsystem_c.dylib 0x18805556c nanosleep + 212 2 libsystem_c.dylib 0x18805536c sleep + 44 3 CustomSDK 0x103697a08 _port_forward_conn_thread + 132 4 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 5 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 6 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #14. Thread 0 libsystem_kernel.dylib 0x1880de328 __select + 8 1 CustomSDK 0x103697e88 _port_forward_io_thread + 740 2 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 3 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 4 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #15. Thread 0 libsystem_kernel.dylib 0x1880de328 __select + 8 1 AppName 0x101be7740 BasicTaskScheduler::SingleStep(unsigned int) + 91 (BasicTaskScheduler.cpp:91) 2 AppName 0x101be70d0 BasicTaskScheduler0::doEventLoop(char volatile*) + 79 (BasicTaskScheduler0.cpp:79) 3 AppName 0x101d6086c Demux(demux_t*) + 1420 (live555.cpp:1420) 4 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 5 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #16. Thread 0 libsystem_kernel.dylib 0x1880ddee4 __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x18815d4d8 _pthread_cond_wait$VARIANT$armv81 + 680 2 AppName 0x100cc08a8 vlc_cond_timedwait + 263 (thread.c:263) 3 AppName 0x100cbff40 vlc_timer_thread + 85 (timer.c:85) 4 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 5 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 6 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #17. Thread 0 libsystem_kernel.dylib 0x1880d3130 semaphore_wait_trap + 8 1 AppName 0x100c93ad4 aout_DecPlay + 212 (dec.c:212) 2 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 3 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #18. Thread 0 libsystem_kernel.dylib 0x1880ddee4 __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x18815d4a4 _pthread_cond_wait$VARIANT$armv81 + 628 2 AppName 0x100c78220 DecoderThread + 1596 (decoder.c:1596) 3 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 4 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #19. AURemoteIO::IOThread 0 libsystem_kernel.dylib 0x1880d30f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x1880d25a0 mach_msg + 72 2 AudioToolbox 0x18c401890 AURemoteIO::IOThread::Run() + 256 3 AudioToolbox 0x18c406800 AURemoteIO::IOThread::Entry(void*) + 76 4 AudioToolbox 0x18c7d94f8 CAPThread::Entry(CAPThread*) + 88 5 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 6 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 7 libsystem_pthread.dylib 0x188163cdc thread_start + 4 #20. Thread 0 libsystem_kernel.dylib 0x1880deb74 __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x1881611f8 _pthread_wqthread + 532 2 libsystem_pthread.dylib 0x188163cd4 start_wqthread + 4 #21. Thread 0 libsystem_kernel.dylib 0x1880deb74 __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x188161138 _pthread_wqthread + 340 2 libsystem_pthread.dylib 0x188163cd4 start_wqthread + 4 #22. Crashed: com.apple.coreaudio.auremoteio 0 AudioToolbox 0x18c489058 SampleRateConverter::SetProperty(unsigned int, unsigned int, void const*) + 192 1 AudioToolbox 0x18c669580 AudioConverterSetProperty + 96 2 AudioToolbox 0x18c51c638 AUConverterBase::SetupConverter(unsigned int, bool) + 1340 3 AudioToolbox 0x18c3fe948 AURemoteIO::SetupConverter(unsigned int, bool) + 224 4 AudioToolbox 0x18c51aed8 AUConverterBase::SetupAllConverters(bool, unsigned int) + 104 5 AudioToolbox 0x18c400a0c AURemoteIO::IOFormatsChanged(int) + 1420 6 AudioToolbox 0x18c402afc __AURIOCallbackReceiver_IOFormatsChanged_block_invoke + 96 7 libdispatch.dylib 0x187f80a38 _dispatch_call_block_and_release + 24 8 libdispatch.dylib 0x187f817d4 _dispatch_client_callout + 16 9 libdispatch.dylib 0x187f5cdec _dispatch_lane_serial_drain$VARIANT$armv81 + 548 10 libdispatch.dylib 0x187f5d92c _dispatch_lane_invoke$VARIANT$armv81 + 408 11 libdispatch.dylib 0x187f65e08 _dispatch_workloop_worker_thread + 584 12 libsystem_pthread.dylib 0x188161114 _pthread_wqthread + 304 13 libsystem_pthread.dylib 0x188163cd4 start_wqthread + 4 #23. Thread 0 libsystem_kernel.dylib 0x1880deb74 __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x188161138 _pthread_wqthread + 340 2 libsystem_pthread.dylib 0x188163cd4 start_wqthread + 4 #24. Thread 0 libsystem_kernel.dylib 0x1880deb74 __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x1881611f8 _pthread_wqthread + 532 2 libsystem_pthread.dylib 0x188163cd4 start_wqthread + 4 #25. Thread 0 libsystem_kernel.dylib 0x1880deb74 __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x1881611f8 _pthread_wqthread + 532 2 libsystem_pthread.dylib 0x188163cd4 start_wqthread + 4 #26. AURemoteIO::IOThread 0 libsystem_kernel.dylib 0x1880d30f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x1880d25a0 mach_msg + 72 2 AudioToolbox 0x18c401890 AURemoteIO::IOThread::Run() + 256 3 AudioToolbox 0x18c406800 AURemoteIO::IOThread::Entry(void*) + 76 4 AudioToolbox 0x18c7d94f8 CAPThread::Entry(CAPThread*) + 88 5 libsystem_pthread.dylib 0x1881602c0 _pthread_body + 128 6 libsystem_pthread.dylib 0x188160220 _pthread_start + 44 7 libsystem_pthread.dylib 0x188163cdc thread_start + 4