(lldb) thread backtrace all
thread #1: tid = 0xd64c4, 0x3852c49c libsystem_kernel.dylib`mach_msg_trap + 20, queue = 'com.apple.main-thread'
frame #0: 0x3852c49c libsystem_kernel.dylib`mach_msg_trap + 20
frame #1: 0x3852c294 libsystem_kernel.dylib`mach_msg + 40
frame #2: 0x29f3a7f2 CoreFoundation`__CFRunLoopServiceMachPort + 146
frame #3: 0x29f38db8 CoreFoundation`__CFRunLoopRun + 1016
frame #4: 0x29e849a0 CoreFoundation`CFRunLoopRunSpecific + 476
frame #5: 0x29e847b2 CoreFoundation`CFRunLoopRunInMode + 106
frame #6: 0x316361a8 GraphicsServices`GSEventRunModal + 136
frame #7: 0x2d60f694 UIKit`UIApplicationMain + 1440
frame #8: 0x0015fc64 proto`main + 196 at AppDelegate.swift:12
thread #2: tid = 0xd657f, 0x3852c24c libsystem_kernel.dylib`kevent64 + 24, queue = 'com.apple.libdispatch-manager'
frame #0: 0x3852c24c libsystem_kernel.dylib`kevent64 + 24
frame #1: 0x00f08bf8 libdispatch.dylib`_dispatch_mgr_invoke + 280
frame #2: 0x00efcc92 libdispatch.dylib`_dispatch_mgr_thread + 38
thread #3: tid = 0xd6580, 0x385409c0 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #0: 0x385409c0 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #1: 0x385bde24 libsystem_pthread.dylib`_pthread_wqthread + 792
frame #2: 0x385bdafc libsystem_pthread.dylib`start_wqthread + 8
thread #7: tid = 0xd65ab, 0x3852c49c libsystem_kernel.dylib`mach_msg_trap + 20, name = 'AFNetworking'
frame #0: 0x3852c49c libsystem_kernel.dylib`mach_msg_trap + 20
frame #1: 0x3852c294 libsystem_kernel.dylib`mach_msg + 40
frame #2: 0x29f3a7f2 CoreFoundation`__CFRunLoopServiceMachPort + 146
frame #3: 0x29f38db8 CoreFoundation`__CFRunLoopRun + 1016
frame #4: 0x29e849a0 CoreFoundation`CFRunLoopRunSpecific + 476
frame #5: 0x29e847b2 CoreFoundation`CFRunLoopRunInMode + 106
frame #6: 0x2abeddc0 Foundation`-[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 264
frame #7: 0x2ac3be7c Foundation`-[NSRunLoop(NSRunLoop) run] + 80
frame #8: 0x001705d2 proto`+[AFURLConnectionOperation networkRequestThreadEntryPoint:](self=0x005b8af4, _cmd=0x0050ca11, object=0x00000000) + 354 at AFURLConnectionOperation.m:168
frame #9: 0x2acb318a Foundation`__NSThread__main__ + 1118
frame #10: 0x385bfdea libsystem_pthread.dylib`_pthread_body + 138
frame #11: 0x385bfd5e libsystem_pthread.dylib`_pthread_start + 118
frame #12: 0x385bdb08 libsystem_pthread.dylib`thread_start + 8
thread #8: tid = 0xd65ae, 0x3852c49c libsystem_kernel.dylib`mach_msg_trap + 20, name = 'com.apple.NSURLConnectionLoader'
frame #0: 0x3852c49c libsystem_kernel.dylib`mach_msg_trap + 20
frame #1: 0x3852c294 libsystem_kernel.dylib`mach_msg + 40
frame #2: 0x29f3a7f2 CoreFoundation`__CFRunLoopServiceMachPort + 146
frame #3: 0x29f38db8 CoreFoundation`__CFRunLoopRun + 1016
frame #4: 0x29e849a0 CoreFoundation`CFRunLoopRunSpecific + 476
frame #5: 0x29e847b2 CoreFoundation`CFRunLoopRunInMode + 106
frame #6: 0x29a22646 CFNetwork`+[NSURLConnection(Loader) _resourceLoadLoop:] + 486
frame #7: 0x2acb318a Foundation`__NSThread__main__ + 1118
frame #8: 0x385bfdea libsystem_pthread.dylib`_pthread_body + 138
frame #9: 0x385bfd5e libsystem_pthread.dylib`_pthread_start + 118
frame #10: 0x385bdb08 libsystem_pthread.dylib`thread_start + 8
thread #10: tid = 0xd65b5, 0x38540080 libsystem_kernel.dylib`__select + 20, name = 'com.apple.CFSocket.private'
frame #0: 0x38540080 libsystem_kernel.dylib`__select + 20
frame #1: 0x29f3efa4 CoreFoundation`__CFSocketManager + 532
frame #2: 0x385bfdea libsystem_pthread.dylib`_pthread_body + 138
frame #3: 0x385bfd5e libsystem_pthread.dylib`_pthread_start + 118
frame #4: 0x385bdb08 libsystem_pthread.dylib`thread_start + 8
thread #12: tid = 0xd65bf, 0x3852c4ec libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'com.apple.coremedia.player.async'
frame #0: 0x3852c4ec libsystem_kernel.dylib`semaphore_wait_trap + 8
frame #1: 0x00f0703e libdispatch.dylib`_dispatch_semaphore_wait_slow + 190
frame #2: 0x2b9bb696 MediaToolbox`fpa_AsyncMovieControlThread + 1966
frame #3: 0x2a6e4d2e CoreMedia`figThreadMain + 186
frame #4: 0x385bfdea libsystem_pthread.dylib`_pthread_body + 138
frame #5: 0x385bfd5e libsystem_pthread.dylib`_pthread_start + 118
frame #6: 0x385bdb08 libsystem_pthread.dylib`thread_start + 8
thread #13: tid = 0xd65c0, 0x3852c49c libsystem_kernel.dylib`mach_msg_trap + 20, name = 'AVAudioSession Notify Thread'
frame #0: 0x3852c49c libsystem_kernel.dylib`mach_msg_trap + 20
frame #1: 0x3852c294 libsystem_kernel.dylib`mach_msg + 40
frame #2: 0x29f3a7f2 CoreFoundation`__CFRunLoopServiceMachPort + 146
frame #3: 0x29f38db8 CoreFoundation`__CFRunLoopRun + 1016
frame #4: 0x29e849a0 CoreFoundation`CFRunLoopRunSpecific + 476
frame #5: 0x29e847b2 CoreFoundation`CFRunLoopRunInMode + 106
frame #6: 0x28b8bf2c libAVFAudio.dylib`GenericRunLoopThread::Entry(void*) + 132
frame #7: 0x28b7e426 libAVFAudio.dylib`CAPThread::Entry(CAPThread*) + 194
frame #8: 0x385bfdea libsystem_pthread.dylib`_pthread_body + 138
frame #9: 0x385bfd5e libsystem_pthread.dylib`_pthread_start + 118
frame #10: 0x385bdb08 libsystem_pthread.dylib`thread_start + 8
thread #21: tid = 0xd6787, 0x385409c0 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #0: 0x385409c0 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #1: 0x385bde24 libsystem_pthread.dylib`_pthread_wqthread + 792
frame #2: 0x385bdafc libsystem_pthread.dylib`start_wqthread + 8
thread #23: tid = 0xd67b5, 0x385409c0 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #0: 0x385409c0 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #1: 0x385bde24 libsystem_pthread.dylib`_pthread_wqthread + 792
frame #2: 0x385bdafc libsystem_pthread.dylib`start_wqthread + 8
thread #24: tid = 0xd67b6, 0x385409c0 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #0: 0x385409c0 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #1: 0x385bde24 libsystem_pthread.dylib`_pthread_wqthread + 792
frame #2: 0x385bdafc libsystem_pthread.dylib`start_wqthread + 8
* thread #25: tid = 0xd67d5, 0x0029d716 proto`to_host(p=0x00000000) + 6 at AVEncoder.mm:16, queue = 'RemoteClientNotifyQueue', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
* frame #0: 0x0029d716 proto`to_host(p=0x00000000) + 6 at AVEncoder.mm:16
frame #1: 0x0029d3be proto`-[AVEncoder swapFiles:](self=0x1564fce0, _cmd=0x0051dc82, oldPath=0x16974d90) + 330 at AVEncoder.mm:299
frame #2: 0x0029d126 proto`__25-[AVEncoder encodeFrame:]_block_invoke_2 + 158 at AVEncoder.mm:281
frame #3: 0x28a4d938 AVFoundation`-[AVAssetWriterFigAssetWriterNotificationHandler _handleCompletedWritingNotification] + 28
frame #4: 0x28a4d562 AVFoundation`AVAssetWriterFigAssetWriterHandleCompletedNotification + 70
frame #5: 0x28ad923c AVFoundation`AVCMNotificationDispatcherCallback + 192
frame #6: 0x29e8d68a CoreFoundation`__CFNotificationCenterAddObserver_block_invoke + 126
frame #7: 0x29f2d0c4 CoreFoundation`__CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
frame #8: 0x29e86cbc CoreFoundation`_CFXNotificationPost + 1800
frame #9: 0x29ea80b4 CoreFoundation`CFNotificationCenterPostNotification + 108
frame #10: 0x2a6c90ee CoreMedia`CMNotificationCenterPostNotification + 86
frame #11: 0x2bb03cb0 MediaToolbox`FigRemakerFamilyCallbacksServer_NotificationIsPending + 220
frame #12: 0x2bb09b86 MediaToolbox`figremakerfamilycallbacks_server + 70
frame #13: 0x00effa62 libdispatch.dylib`dispatch_mig_server + 362
frame #14: 0x00f0e072 libdispatch.dylib`_dispatch_source_latch_and_call + 1810
frame #15: 0x00efcd6c libdispatch.dylib`_dispatch_source_invoke + 212
frame #16: 0x00f0391e libdispatch.dylib`_dispatch_queue_drain + 582
frame #17: 0x00efdac4 libdispatch.dylib`_dispatch_queue_invoke + 88
frame #18: 0x00f05b1a libdispatch.dylib`_dispatch_root_queue_drain + 1294
frame #19: 0x00f06e20 libdispatch.dylib`_dispatch_worker_thread3 + 108
frame #20: 0x385bdda8 libsystem_pthread.dylib`_pthread_wqthread + 668
frame #21: 0x385bdafc libsystem_pthread.dylib`start_wqthread + 8
thread #26: tid = 0xd680a, 0x385bdaf4 libsystem_pthread.dylib`start_wqthread
frame #0: 0x385bdaf4 libsystem_pthread.dylib`start_wqthread
thread #27: tid = 0xd681b, 0x29e6ed3c CoreFoundation`CFBasicHashFindBucket + 12012, queue = 'com.apple.avfoundation.videodataoutput.bufferqueue'
frame #0: 0x29e6ed3c CoreFoundation`CFBasicHashFindBucket + 12012
frame #1: 0x29ea6134 CoreFoundation`CFDictionaryGetValueIfPresent + 112
frame #2: 0x2a7257f6 CoreMedia`sbufAtom_appendKeyValuePairAtom + 90
frame #3: 0x2a7252d8 CoreMedia`sbufAtom_appendDictionaryAtom + 152
frame #4: 0x2a722958 CoreMedia`sbufAtom_createSerializedDataAndSurfaceForSampleBuffer + 444
frame #5: 0x2a7226a2 CoreMedia`FigRemote_CreateSerializedAtomDataAndSurfaceForSampleBuffer + 318
frame #6: 0x2a72252e CoreMedia`FigRemote_CreateSerializedAtomDataForSampleBuffer + 66
frame #7: 0x2bb05eca MediaToolbox`remoteWriter_AddSampleBuffer + 110
frame #8: 0x28a5d2c2 AVFoundation`-[AVFigAssetWriterTrack addSampleBuffer:error:] + 78
frame #9: 0x28a59a38 AVFoundation`-[AVAssetWriterInputWritingHelper appendSampleBuffer:] + 184
frame #10: 0x28a578fc AVFoundation`-[AVAssetWriterInput appendSampleBuffer:] + 120
frame #11: 0x002c18f4 proto`-[VideoEncoder encodeFrame:](self=0x156ba0f0, _cmd=0x0051ec7a, sampleBuffer=0x156f5810) + 492 at VideoEncoder.m:75
frame #12: 0x0029cdd2 proto`-[AVEncoder encodeFrame:](self=0x1564fce0, _cmd=0x0051ec7a, sampleBuffer=0x156f5810) + 1282 at AVEncoder.mm:286
frame #13: 0x002ab704 proto`-[KFH264Encoder encodeSampleBuffer:](self=0x155dec30, _cmd=0x0051deb4, sampleBuffer=0x156f5810) + 116 at KFH264Encoder.mm:69
frame #14: 0x002b7a30 proto`-[KFRecorder captureOutput:didOutputSampleBuffer:fromConnection:](self=0x1566a700, _cmd=0x28b4ee52, captureOutput=0x155cb3d0, sampleBuffer=0x156f5810, connection=0x15555a90) + 524 at KFRecorder.m:152
frame #15: 0x28ab3db0 AVFoundation`-[AVCaptureVideoDataOutput _handleRemoteQueueOperation:] + 308
frame #16: 0x28ab3c58 AVFoundation`__47-[AVCaptureVideoDataOutput _updateRemoteQueue:]_block_invoke + 164
frame #17: 0x2a6e32be CoreMedia`__FigRemoteOperationReceiverCreateMessageReceiver_block_invoke + 210
frame #18: 0x2a6f5df4 CoreMedia`__FigRemoteQueueReceiverSetHandler_block_invoke2 + 172
frame #19: 0x00f0e072 libdispatch.dylib`_dispatch_source_latch_and_call + 1810
frame #20: 0x00efcd6c libdispatch.dylib`_dispatch_source_invoke + 212
frame #21: 0x00f0391e libdispatch.dylib`_dispatch_queue_drain + 582
frame #22: 0x00efdac4 libdispatch.dylib`_dispatch_queue_invoke + 88
frame #23: 0x00f0391e libdispatch.dylib`_dispatch_queue_drain + 582
frame #24: 0x00efdac4 libdispatch.dylib`_dispatch_queue_invoke + 88
frame #25: 0x00f05b1a libdispatch.dylib`_dispatch_root_queue_drain + 1294
frame #26: 0x00f06e20 libdispatch.dylib`_dispatch_worker_thread3 + 108
frame #27: 0x385bdda8 libsystem_pthread.dylib`_pthread_wqthread + 668
frame #28: 0x385bdafc libsystem_pthread.dylib`start_wqthread + 8
(lldb)