Re: kern/60522: evbppc/RB800 hits MI pmap KASSERT failure

[Rin Okuyama <rokuyama.rk%gmail.com@localhost>]

On 2026/08/01 23:48, Nick Hudson wrote:
> > On 1 Aug 2026, at 15:44, Rin Okuyama <rokuyama.rk%gmail.com@localhost> wrote:
> >
> > Hi,
> >
> > On 2026/08/01 21:42, Nick Hudson wrote:
> > > Is this a regression? If so can you bisect please
> >
> > Sure. The first bad commit was:
> >
> > https://github.com/NetBSD/src/commit/6162b83d2b80429d87007f1f1c451e538e577581
>
> thanks.
>
> > KASSERT failure disappears if part of this commit is reverted:
> >
> > ```
> > diff --git a/sys/uvm/pmap/pmap.c b/sys/uvm/pmap/pmap.c
> > index cb0f6b3b065..eba0cbba4c7 100644
> > --- a/sys/uvm/pmap/pmap.c
> > +++ b/sys/uvm/pmap/pmap.c
> > @@ -1326,7 +1326,7 @@ pmap_pte_protect(pmap_t pmap, vaddr_t sva, vaddr_t eva, pt_entry_t *ptep,
> > struct vm_page_md * const mdpg = VM_PAGE_TO_MD(pg);
> >
> > pmap_page_set_attributes(mdpg, VM_PAGEMD_MODIFIED);
> > - if (VM_PAGEMD_EXECPAGE_P(mdpg) || (prot & VM_PROT_EXECUTE)) {
> > + if (VM_PAGEMD_EXECPAGE_P(mdpg)) {
> > KASSERT(!VM_PAGEMD_PVLIST_EMPTY_P(mdpg));
> > #ifdef PMAP_VIRTUAL_CACHE_ALIASES
> > if (VM_PAGEMD_CACHED_P(mdpg)) {
> > ```
>
> This doesn’t make a lot of sense to me at first glance.
>
> Could you get the UVMHIST dumps with it in place right after the panic, please?

Here it is!

https://www.netbsd.org/~rin/kern60522_uvmhist.tgz

Thanks,
rin

> > > Otherwise, please enable UVMHIST and dump pmaphist and pmapexechist after the panic.