Jeff Rizzo <riz@NetBSD.org> writes:

> This is just another request for someone in the know to either fix or
> implement a workaround for port-macppc/30410, which is
> "netbsd-2, netbsd-3, and -current GENERIC crash with MCHK trap on G4".
> We've got releases upcoming, and we _really_ want to have this fixed
> so that GENERIC isn't crashing for people.  As it stands now,
> both upcoming major release branches suffer from it.

I don't think anyone, "in the know" or otherwise, has a good
understanding of this bug. Timo's note in the PR may be referring to
my observation that the non-AltiVec pmap_zero_page() has the same kind
of bug that the AltiVec version did, which would cause problems at -O1
or -O0. But that's fixed now, the bug in 30410 is at the normal -O2, a
G4 with a GENERIC kernel should always be using the AltiVec version
anyway, and it shouldn't be model-specific behavior. So this is a
different bug.

My system (g4/400 pci) doesn't trigger it...

        - Nathan