https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245392

--- Comment #10 from Anatoli <m...@anatoli.ws> ---
After a lot of triage, Peter Grehan identified the source of the problem and
prepared a patch (attached).

His description of the cause: the problem was that OpenBSD issues 4-byte PCI
configuration-space register reads/writes to consecutive 2-byte fields. In
general this is benign, but it exposed 2 bugs in the bhyve PCI emulation where
this wasn't being handled correctly.

This can be fixed by applying the attached patch and rebuilding user-space
bhyve.

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