Are you using Core Image, by any chance? I'm hitting something very similar, developing for macOS and running under Xcode 16.2 on macOS 15.5. Doing a lot of video work using Core Image, and I get these crashes during a CIRenderTask pretty frequently (like within a few minutes of live rendering), usually within a call to CI::Context::recursive_render. We do get occasional crash reports from release builds, crashing on locking calls within Core Image, but none of those involve qosWaiterSignallerInvariantCheck, and we hit them much, much more often when running with Thread Performance Checker on.

Thanks for posting this follow-up! Might you be willing to expand a bit on what you heard from Apple and whether/how you got it working? I've tried starting with IOServiceMatching("IODPDevice"), but I still get a null iterator—and there's nothing like IODPDevice in ioreg's output. Otherwise, the only option I've found for getting any EDID info on an M1 appears to be to use CoreDisplay, but I'd rather use something documented.