Re: NetBSD/hpcmips userland crashes (Re: IBM Workpad z50 dmesg collection)

[David Brownlee <abs%absd.org@localhost>]

On Mon, 20 Mar 2023 at 17:22, Alexander Bochmann <ab%lists.gxis.de@localhost> wrote:
>
> ...on 2023-03-19 21:37:51, David Brownlee wrote:
>
>  > Sorry - could you confirm if 2016-07-01 works or hangs?
>
> 2016-07-01 is the last good one.
>
>  > It feels like progress - if can can identify the last working/first
>  > failing, we can run down the intervening commits and either build another
>  > kernel ot two, or point at a candidate change.
>
> Great, thanks :)
>
> I still have the pcmcia problem on my list, but that's certainly
> much later on in the timeline.

Will come back to that :-p

OK, taking a look at the commit log between 2016-07-01 and 08-01
https://sync.absd.org/hpcmips/2016-07-01-to-2016-08-01.log (this is
from a git copy as its just much easier to work with), shows....
- a binutils update (boo)
- a whole host of small mips changes
- MIPS changing to use the common pmap code

My money would be on the last one being the cause, with the common
pmap code maybe not handling some edge-case in the VR4121.

But... progress! Sounds like I need to fire up my compiler to build
another couple of test kernels to narrow it down (watch this space :)

David