Kernel prepatch 6.16-rc6

Linus has released 6.16-rc6 for testing;
it includes a fix for a somewhat scary regression that came up over the
week.

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.