Suspected KBI breakage between FreeBSD 11.1-p9 and FreeBSD 11.2-BETA3

[Ka Ho Ng]

Hi folks,

After an upgrade from 11.1-p9 to 11.2-BETA3, vboxdrv and nvidia no longer
works. `kldload vboxdrv` will throw kernel panic immediately.

Here are the corresponding bugzilla tickets:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228535
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228536

Since these two kmod work after rebuilding the package, I suspect the issue
is due to KBI breakage.

Could anyone take a look into the issue?

Thanks,
Ka Ho