[Bug 220184] clang 4.0.0 segfaults on buildworld

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220184

--- Comment #20 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Chris Collins from comments #18 and #19)

Interesting --and non-obvious.

>From what I've read Message Signaled Interrupts (MSI)
from PCI 2.2+ depend on LAPIC, requiring LAPIC to be
enabled.

If LAPIC is not working correctly then MSI might not
work fully correctly either and so should be avoided
in such a context?

(I'm not familiar with the details in this area. Take
the above as hear-say.)

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