Crash when converting MIDI 1 to MIDI 2

[reuk]

@mfritze

Is it possible that your lambda function is deallocated at that point and it jumps into nowhere?

The lambda in question is in a system framework, not provided by JUCE. If the lambda is getting deallocated, there’s not much we can do about it in JUCE. As far as I can tell, JUCE only calls the host-provided MIDI output callback at points where it is valid to do so.

Based on the response here, it sounds like this is confirmed as a bug in CoreAudio (linking here to keep both threads in sync).

Logic 10.7.8 and native M1 crash on some systems

AUv2 instruments, which use legacy MIDI 1.0 and implement a MIDI Output Callback crash CoreAudio inside the MIDI 2.0 translation. So, yes, disabling MIDI 2 should solve it right now. That said, we also found a solution on the Logic Pro side to avoid that crash altogether. But we need to continue to look into this further.