Re: HEADS UP: Merging drm update

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

> Date: Thu, 23 Dec 2021 00:57:13 +0900
> From: Ryo ONODERA <ryo%tetera.org@localhost>
> 
> Ryo ONODERA <ryo%tetera.org@localhost> writes:
> 
> > I have no useful information or thought yet…
> >
> > I have added check for BADADDR+OPREGION_SIZE in bus_space_reserve.
> > And I have found that no one uses that address.
> 
> I have added similar logic to extent_alloc_region() and
> extent_insert_and_optimize(). And I have found that someone
> reserves 0x6375c000 to 0x63f3ffff.
> However I cannot find who reserves this range.
> i915drmkms wants 0x63ec5018 to 0x63ec7017 and this is overlapped
> with 0x6375c000 to 0x63f3ffff.

Can you use db_stacktrace() in extent_alloc_region and
extent_insert_and_optimize when the region covers that address?  That
might help narrow it down.