Cannot passthrough usb with bus number and device number

Sometimes, qemu cannot find correct usb device number Reproduce steps: 1、lsusb Bus 001 Device 011: ID 090c:1000 1、prepare usb device attach xml <hostdev managed="yes" mode="subsystem" type="usb"> <source> <vendor id="0x090c" /> <product id="0x1000" /> <address bus='001' device='011'/> </source><address bus="1" port="1" type="usb" /> </hostdev> 2、virsh attach-device vm usb.xml error: internal error: Did not find USB device 090c:1000 bus:1 device 9 Question: why the device number returned in qemu's error report is not what I wrote in xml， what I mean is that if my dev number is really wrong, the returned error should also be the number I wrote， commonly when using dongle Look forward to your reply yaohua.wu