Re: kern/57154: CPU N3150 panics with DRMkms related function

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

>  rbx         fffffffffffffff0
> [...]
>  netbsd:mutex_oncpu+0x1e:        movq    0(%rbx),%rax

This is weird -- it looks like the mutex has been destroyed:
0xffff...fff0 is -16, which is MUTEX_THREAD, which is what
mutex_destroy sets mtx->mtx_owner too.

Can you add #include <ddb/ddb.h> to intel_rps.c and call
db_stacktrace() in intel_rps_fini?  I think that's the only place the
mutex is destroyed.