On Sat, Mar 25, 2017 at 03:35:24PM -0500, Thaddeus Nielsen wrote:
> Setting up virtualbox-dkms (5.1.8-dfsg-6~bpo8+2) ...

This isn't from jessie, it's from backports.

> Building for 4.9.0-0.bpo.2-amd64

This is also from backports, not from jessie.

>From the vbox changelog:
"* Linux hosts: compile Linux 4.9 compile fix (bug #16286)"
<https://www.virtualbox.org/wiki/Changelog-5.1#v12>
<https://www.virtualbox.org/ticket/16286>

Either downgrade your kernel, or upgrade to virtualbox 5.1.12 or higher.

Greg


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