How to troubleshoot why VirtualBox kernel module freezes the system?

[Yuri]

Bernhard Froehlich wrote:
> Mario Lobo currently sees something similar and has already tracked it
> down to probably be a drm/Xorg issue. It does work fine for him if he uses
> the virtualbox-ose-devel ports and VNC so without running an xserver on
> that machine.
>   
Looks like you are right.
Now I am running VirtualBox from virtualbox-ose ports under vnc on the 
same machine where xserver is (with nvidia driver) without a problem.

This appears to be a workaround.

Thank you!
Yuri