Hi all, I create successfully a vm, then opening one terminal to run example event-python.py from libvirt-0.7.4 source code package with qemu:///system parameter.in another opening terminal,running basic domain operation, such as undefine/define/start/destroy.but original terminal display information "libvir: QEMU error : remoteDomainProcessEvent: unmarshalling msg" . test environment details is as following: [root@localhost events-python]# uname -a Linux localhost.localdomain 2.6.31.5-127.fc12.i686.PAE #1 SMP Sat Nov 7 21:25:57 EST 2009 i686 i686 i386 GNU/Linux [root@localhost events-python]# lsmod|grep kvm kvm_intel 39856 0 kvm 140260 1 kvm_intel [root@localhost events-python]# rpm -qa|grep virt virt-v2v-0.2.0-1.fc12.noarch virtuoso-opensource-conductor-5.0.12-1.fc12.noarch libvirt-python-0.7.1-15.fc12.i686 virtuoso-opensource-apps-5.0.12-1.fc12.i686 virtuoso-opensource-doc-5.0.12-1.fc12.noarch virtuoso-opensource-5.0.12-1.fc12.i686 virt-manager-0.8.0-7.fc12.noarch virtuoso-opensource-utils-5.0.12-1.fc12.i686 virt-ctrl-1.0.1-4.fc12.i686 virt-top-1.0.4-1.fc12.1.i686 virt-viewer-0.2.0-1.fc12.i686 virtaal-0.4.1-1.fc12.noarch libvirt-client-0.7.1-15.fc12.i686 python-virtinst-0.500.0-5.fc12.noarch virt-mem-0.3.1-9.fc12.i686 libvirt-0.7.1-15.fc12.i686 1. open one terminal and run event-test.py [root@localhost events-python]# python event-test.py qemu:///system Using uri:qemu:///system libvir: QEMU error : remoteDomainProcessEvent: unmarshalling msg libvir: Remote error : unknown program (received 77696e78, expected 20008086) libvir: Remote error : unknown program (received 77696e78, expected 20008086) libvir: Remote error : unknown program (received 77696e78, expected 20008086) 2.open another termial and run basic domain operation [root@localhost ajia]# virsh list --all Id Name State ---------------------------------- - winxp shut off [root@localhost ajia]# virsh undefine winxp Domain winxp has been undefined [root@localhost ajia]# virsh define winxp.xml Domain winxp defined from winxp.xml [root@localhost ajia]# virsh start winxp Domain winxp started [root@localhost ajia]# virsh destroy winxp Domain winxp destroyed I am puzzled to domain event handler,and I don't clear if is libvirt version different problem or I miss some stuff. I would be most grateful for any response . Best Regards, Alex Jia