How to troubleshoot why VirtualBox kernel module freezes the system?

[Yuri]

Alexey Shuvaev wrote:
> As a record it is running fine here:
> ~> uname -a
> FreeBSD wep4035 9.0-CURRENT FreeBSD 9.0-CURRENT #0 r206758: Sat Apr 17 
> 17:37:46 CEST 2010     root at wep4035:/usr/obj/usr/src/sys/GENERIC  amd64
>   

I tried to install 9.0-CURRENT (r206758).
nvidia driver crashes the system there (it is of course was rebuilt with 
90 sources).
90-CURENT is also much slower due to the debugging options turned on. 
This may prevent bug in VirtualBox kernel module from hanging the system 
too.

Yuri