[Bug 239245] r350074 will panic on ppc64 PowerMac G5 in vm_phys_enqueue_contig

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239245

--- Comment #34 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Francis Little from comment #31)

If I read Dennis Clarke's material correctly,
he is not using usefdt=1 . Also, as of r347463,
the known issue for which usefdt=1 was being
used was handled and use of usefdt mode was not
known to be required any more.

So you may have run into something new. If so,
figuring out what is distinct between Dennis's
and your context's that makes the difference
would be important to isolating the problem
that is avoided by usefdt=1 for you.

(Past a activity in my context does not suggest
that I'd get a repeat of your result. But I'll
likely not have time to set up and perform any
tests soon.)

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