If the system reboots then you have a panic. Can you add
dumpdev="AUTO" in
your /etc/rc.conf? And then please give us a kernel panic backtrace :
http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-gdb.html
2013/3/18 Dominic Fandrey <kamikaze at bsdforen.de>
> My system doesn't resume with an active VirtualBox VM, in this case
> Windows XP/32. I didn't test any other systems.
>
> The system comes back to the console screen, but doesn't get back
> into X. After a couple of seconds (no dump occurs) I get the BIOS
> screen and the system reboots with unclean file systems.
>
> # uname -a
> FreeBSD mobileKamikaze.norad 9.1-STABLE FreeBSD 9.1-STABLE #3 r247136: Fri
> Feb 22 00:52:22 CET 2013 root at
mobileKamikaze.norad:/usr/obj/HP6510b-9/amd64/usr/src/sys/HP6510b-9
> amd64
>
> Hardware virtualization is turned on, the additions are installed
> in the VM.
>
> --
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> Q: Why is top-posting such a bad thing?
> A: Top-posting.
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--
Demelier David