Kernel prepatch 6.16-rc6
So I was flailing around blaming everybody and their pet hamster, because for a while it looked like a drm issue and then a netlink problem (it superficially coincided with separate issues with both of those subsystems).But I did eventually figure out how to trigger it reliably and then it bisected nicely, and a couple of days have passed, and I'm feeling much better about the release again. We're back on track, and despite that little scare, I think we're in good shape.