I have been working with a small team testing VirtualBox on FreeBSD 11.2 as
well as the 12.0beta3 and in both cases we see curious problems. In the case
of vbox on 11.2 we can create a FreeBSD 11.2 virtual guest and then even
install the extension pack from the pkg repo. However any real cpu load
will result in the virtual machine to crash for reasons unknown. We tested
this with some trivial scp of a set of 1GB files and within 60 secs the
virtual machine would crash.
In the case of 12.0b3 we used an ovf export from the 11.2 system and the
import process went smoothly. The vnc connection will not work at all so
there is no way to "see" a virtual machine console. Regardless we could
boot the virtual machine and try the same sort of tests only to get the
same result : a FreeBSD 11.2 virtual machine crashes within 60 to 90 secs
of any cpu load.
The hardware is fairly top of the line Xeon based server hardware with
Adaptec(MicroSemi) 8000 series SAS controllers and 128G of memory on
the host systems. No amount of tweaking of the virtual machine conf
would bring stability.
Not sure how to proceed but there is a multitude of bugs here.
(In reply to Dennis Clarke from comment #0)
Did you tweak the AIO options? See the pkg-message for vbox:
Also, you should check system logs and vbox logs in the virtual machine dirs. If you can, post the vbox logs.
I want to close this as "can not reproduce" in a reliable manner.