[libvirt] OpenBSD crash after "shutdown vm"

Good evening all, firstly I'd like to thank you for your wonderful job: it works nicely and simplifies a lot my life :) after saying that, I'd like to expose you a "bug" (not sure if I can call it this way): 1. scenario: as host I've configured a Ubuntu 10.04 with KVM + libvirt + LVM; I have also configured 4 virtual machines, three of wich are OpenBSDs and the other one is Linux (Fedora 13). 2. issue: when I issue a shutdown to a OpenBSD guest using "virsh shutdown vm" what happens is that the guest machine crashes. To be more precise it seems a kernel panic becuase the vnc session through KVM still works as the machine is running but every digit I issue does not appear on the server shell. Also the ssh sessions die; After having a chat in the #libvirt channel I tried doing this both with acpibtn enabled (on OpenBSD is the default behaviour) and also with acpibtn disabled (using the command "boot -c" and then "disable acpi" at boot time in the OpenBSD server). In both cases the server crashes At this point I have found an alternative way to automatically shut down the machine (using ssh) but it would be nice to understand way this happens. Is this a well-known issue? Is there a way to deeply debug it? Thanks a lot! 0x412E