Hello I have an application that plays midi songs with different instruments. When the user picks a song, a new MIDISynth node is added to the audio graph and the related soundfont is loaded. When user decides to play a different song, he has to go back which causes audio unit to be uninitialized and the graph is updated. Then, the user can pick a new song to play.
The issue is that sometimes when user decides to go back (which removes and uninitializes a node), the application crashes. When the application crashes, the last call I make is to: AudioUnitUninitialize. The crashing thread is AURemoteIO::IOThread, crashing at SamplerBaseElement::IncrementActiveLayerVoiceCount. Last thing I see in the logs is: '238: Illegal decrement of empty layer bin count' The uninitialization flow my app uses is this: 1. Disconnect synth node from the mixer (AUGraphDisconnectNodeInput) 2. Remove synth node from the graph (AUGraphRemoveNode) 3. Uninitialize the synth audio unit (AudioUnitUninitialize) - crash 4. Update the graph (AUGraphUpdate) >From my testing, the crash is seemingly random - it takes anywhere between 2 to 20 repeats to reproduce (pick a song, go back, then again). The music plays as intended. Tested on iPhone XS with iOS 12.1.2. I haven't tested this on a mono iPhone yet. Will try to reproduce and get back with findings. Any ideas what's wrong here? Could this be a threading issue? Regards, Bartosz Nowotny
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