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Description of problem: No error when Hotplug/Coldplug duplicate USB device with bus + device Version-Release number of selected component (if applicable): libvirt-0.9.10-2.el6.x86_64 How reproducible: always Steps to Reproduce: [root@zhpeng ~]# lsusb Bus 001 Device 004: ID 0951:1625 Kingston Technology DataTraveler 101 II prepare usb device xml: <hostdev mode='subsystem' type='usb' managed='yes'> <source> <address bus='1' device='4'/> </source> </hostdev> # virsh start kvm1 # virsh attach-device kvm1 usb1.xml Device attached successfully # virsh attach-device kvm1 usb1.xml Device attached successfully # virsh attach-device kvm1 usb1.xml Device attached successfully # virsh dumpxml kvm1 ... <hostdev mode='subsystem' type='usb' managed='yes'> <source> <address bus='1' device='4'/> </source> <alias name='hostdev0'/> </hostdev> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <address bus='1' device='4'/> </source> <alias name='hostdev1'/> </hostdev> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <address bus='1' device='4'/> </source> <alias name='hostdev2'/> </hostdev> ... Actual results: There is no error Expected results: Error shows and stop user do this Additional info: