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Description of problem: libvirt should check the duplicate port for serial/channel devices Version-Release number of selected component (if applicable): qemu-kvm-1.5.3-84.el7.x86_64 libvirt-1.2.8-11.el7.x86_64 kernel-3.10.0-219.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.[root@localhost songwang]# virsh list --all Id Name State ---------------------------------------------------- - aa shut off 2. virsh dumpxml aa ..... <serial type='pty'> <target port='0'/> </serial> <serial type='pty'> <target port='1'/> </serial> <serial type='pty'> <target port='2'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <channel type='pty'> <target type='virtio'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <channel type='pty'> <target type='virtio'/> <address type='virtio-serial' controller='0' bus='0' port='2'/> </channel> <channel type='pty'> <target type='virtio'/> <address type='virtio-serial' controller='0' bus='0' port='3'/> </channel> ....... 3.add these to xml. <serial type='pty'> <target port='1'/> </serial> <channel type='pty'> <target type='virtio'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> 4.[root@localhost songwang]# virsh edit aa Domain aa XML configuration edited. 5.#virsh dumpxml aa .... <serial type='pty'> <target port='0'/> </serial> <serial type='pty'> <target port='1'/> </serial> <serial type='pty'> <target port='2'/> </serial> <serial type='pty'> <target port='1'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <channel type='pty'> <target type='virtio'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <channel type='pty'> <target type='virtio'/> <address type='virtio-serial' controller='0' bus='0' port='2'/> </channel> <channel type='pty'> <target type='virtio'/> <address type='virtio-serial' controller='0' bus='0' port='3'/> </channel> <channel type='pty'> <target type='virtio'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> ...... 6.[root@localhost songwang]# virsh start aa error: Failed to start domain aa error: internal error: process exited while connecting to monitor: 2014-12-29T08:26:21.233643Z qemu-kvm: -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel3,id=channel3,name=com.redhat.spice.0: virtio-serial-bus: A port already exists at id 1 2014-12-29T08:26:21.233676Z qemu-kvm: -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel3,id=channel3,name=com.redhat.spice.0: Device initialization failed. 2014-12-29T08:26:21.233686Z qemu-kvm: -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel3,id=channel3,name=com.redhat.spice.0: Device 'virtserialport' could not be initialized Actual results: As steps ,libvirt doesn't check the duplicate port. Expected results: fix it