Vbox causing host crash/reboot on 12-current

I recently started having severe instability on a workstation with
VirtualBox.  I'm not sure if it was caused by the recent large ports
update, or a recent commit that affected SMAP.  I can't seem to find
that revision, would someone please post it and also the workaround to
disable it, I would like to try it after work and see if disabling it
allows VBox to work.  Is anyone else seeing this effect with Vbox?

What I'm seeing is that as soon as a VM is started it reboots the
host, totally reproducible every time.  I tried to rebuild VBox and
kmod, and also some qt5 ports but still not working.  Any help is
appreciated, thanks for reading.

Regards