I am getting an unexpected crash from IOService::Create() when attempting to create a new user-client. The crash is a nullptr exception in OSCopyInObjects(). The last call from my code was IOService::Create(). As far as I can tell, all the input parameters to Create() are correct, and the Info.plist is has the correct key and class information - indeed, if I corrupt these I get an error status return rather than a crash. Any suggestions as to what could be causing this? I suspect that the problem may be related from a change in the underlying application that is creating the user client. This was modified from a standard app to a daemon, following the advice here: https://developer.apple.com/documentation/xcode/signing-a-daemon-with-a-restricted-entitlement. However, it is the driver that crashes - not the host opening the user client.

I am trying to make a driver release, but failing (I think) because the manually generated distribution profiles are for the MacOS platform only, rather than MacOS and iOS together. As far as I can tell, everything is correct in the manual profiles apart from the platform. The necessary entitlements appear to be correct. In contrast, Xcode generated profiles list both MacOS and iOS as the platform and work fine for development and to generate a release archive. But Archives 'Distribute Content' gives only 'Custom' as a distribution mechanism, and no option for notarization. So, the question is: is this a problem with my developer account (and if so, what is the appropriate channel to fix it!), or is this something subtle in the project configuration?