why can't I shutdown my freeBSD vm?

what I get when I try shutdown -h now
is at the end of the process a 50%cpu load(dual core allocated to the vm) and 100% RAM of 2GB.
and the a screen if I open the console with : if you want to reboot the host press a key. After some time a black screen like the vm freezed or something.
I'm using kvm-qemu as hypervisor.
 
Code:
     -h      The system is halted at the specified time.

     -p      The system is halted and the power is turned off (hardware
             support required) at the specified time.
From shutdown(8).
 
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