Confirmed with --verbose: notarytool itself SIGBUSes mid-upload (EXC_BAD_ACCESS, stack guard fault) on the nio.nioTransportServices.connectionchannel thread, inside its own progress-formatting code (String.init(format:)/CFString). Reproduces every time on x64, never on arm64, same machine/creds. Tried nt-upload-connection-timeout=300, no change, same crash. Matches other reports of this exact signature. Happy to send crash logs + zip.

Confirmed with --verbose: notarytool itself SIGBUSes mid-upload (EXC_BAD_ACCESS, stack guard fault) on the nio.nioTransportServices.connectionchannel thread, inside its own progress-formatting code (String.init(format:)/CFString). Reproduces every time on x64, never on arm64, same machine/creds. Tried nt-upload-connection-timeout=300, no change, same crash. Matches other reports of this exact signature. Happy to send crash logs + zip.