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Hi, We have a Video Player App, which seem to crash randomly when player is closed. Crash Info: crash_info_entry_0 : BUG IN CLIENT OF LIBDISPATCH: dispatch_sync called on queue already owned by current thread Stack trace: 0 libdispatch.dylib 0x12dd0 __DISPATCH_WAIT_FOR_QUEUE__ + 484 1 libdispatch.dylib 0x12900 _dispatch_sync_f_slow + 144 2 MediaToolbox 0x1f6374 FigCaptionRendererSessionSetPlayer + 68 3 MediaToolbox 0x2a7b30 setPlayerDo + 184 4 libdispatch.dylib 0x3950 _dispatch_client_callout + 20 5 libdispatch.dylib 0x12a70 _dispatch_lane_barrier_sync_invoke_and_complete + 56 6 MediaToolbox 0x2a7a6c -[FigSubtitleCALayer setPlayer:] + 64 7 AVFCore 0x6e2c0 -[AVPlayer _removeLayer:videoLayer:closedCaptionLayer:subtitleLayer:interstitialLayer:] + 572 8 AVFCore 0x30dc8 -[AVPlayerLayer dealloc] + 324 9 Foundation 0x2cf78 NSKVODeallocate + 216 10 QuartzCore 0x68c54 CA::Layer::free_transaction(CA::Transaction*) + 404 11 QuartzCore 0x4f284 CA::Transaction::commit() + 952 12 MediaToolbox 0x3375bc setBounds + 376 13 MediaToolbox 0x200160 UpdateLayoutContext + 892 14 MediaToolbox 0x1feda8 onCaptionInputDo + 212 15 libdispatch.dylib 0x3950 _dispatch_client_callout + 20 16 libdispatch.dylib 0xb0ac _dispatch_lane_serial_drain + 664 17 libdispatch.dylib 0xbc10 _dispatch_lane_invoke + 392 18 libdispatch.dylib 0x16318 _dispatch_workloop_worker_thread + 656 19 libsystem_pthread.dylib 0x11b0 _pthread_wqthread + 288 20 libsystem_pthread.dylib 0xf50 start_wqthread + 8