Re: HEADS UP: Merging drm update

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

> Date: Tue, 28 Dec 2021 08:41:16 +0900
> From: Ryo ONODERA <ryo%tetera.org@localhost>
> 
> panic: mutex_vector_enter,518: uninitialized lock (lock=0xffffd80023501458, from=ffffffff807c091c)
> cpu0: Begin traceback...
> vpanic() at netbsd:vpanic+0x156
> panic() at netbsd:panic+0x3c
> lockdebug_wantlock() at netbsd:lockdebug_wantlock+0x180
> mutex_enter() at netbsd:mutex_enter+0x213
> intel_rps_mark_interactive() at netbsd:intel_rps_mark_interactive+0x1e

Weird -- can you insert db_stacktrace() into intel_rps_init_early and
intel_rps_fini?  This looks like i915->gt.rps.power.mutex, judging by
the stack trace, but I don't see how we can get here without first
initializing the mutex.