[Bug 224646] Attempts to load non-PAE modules into a PAE-kernel should be rejected

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224646

            Bug ID: 224646
           Summary: Attempts to load non-PAE modules into a PAE-kernel
                    should be rejected
           Product: Base System
           Version: 11.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mi at FreeBSD.org

When a module is built outside of the normal "make kernel" process, it may not
have the PAE defined. There may also be a problem in the other direction.

I was recently bitten by this as documented in Bug #224616 -- vboxguest.ko
installed by the emulators/virtualbox-ose-additions would load, but fail to
initialize itself with an incomprehensible -- and easy to miss --
error-message.

The port-maintainer(s) may fix the problem with the port, but the kldload
and/or kernel need to detect such miscompilations and reject attempts to load
the module -- with an easy to understand error.

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