Thank you for the information, it is a bit unexpected, but useful anyway. My initial problem is that I need to launch a 3rd party sandboxed app from the audio unit plugin as a child process and communicate with it. But it crashes. I worked around this by implementing a launch agent that does this job. An additional layer but so far this solution looks good.

I have the same problem, Xcode 14.2, Ventura 13.4, MacMini M1

@DrMiller have you managed to fix the issue? I have the same problem. I have an Audio Unit that runs as a sand-boxed out-process, when I try to allocate ~30Mb it crashes (sometimes) with exactly the same error.