[Bug 237590] powerpc64 PowerMac11,2 and 7,2 context, -r330614 and later (including -r345758): "ofwdump -ap" crashes the system; probable -r330610 "cause"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237590

--- Comment #10 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Justin Hibbits from comment #7)

"Is this still a problem?": Unsure but I expect:
high probability for yes for without usefdt .
(And, as things are, usefdt mode does not work
well.)

I seem to remember that changes in relation to the
direct map have occurred since head -r360311 (that
I've been running for some time). Definitely broke
for without usefdt in what I'm running.

But I'm not progressing until vm_page_dirty in
pmap_protect and whatever for moea64_protect are
updated and I can verify the result is well
behaved in my contexts.

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