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

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

--- Comment #1 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Mark Millard from comment #0)

I suppose that a possibility is that:

A) It may be ddb related code that can not sleep some
   CPU(s) (because some already are sleeping?).

B) It may be openfirmware tried to use an address that
   is invalid in the kernel on or after -r330610 .

(A) may prevent seeing a notice that would point to (B)
as a possibility, thus hiding the true cause.

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