The syslog output looks like its from the Host not the guest? What does the libvirtd log say for the guest...typically at /var/log/libvirt/qemu/XXX (XXX being the name of the guest).
There are 2 separate issues/related in this thread, first being USB attachment to guests not working which is believed ownership related hence my *workaround* in post #23. The second is about how the USB device is re-atrached to the Host once the guest has been destroyed...this is what the syslog/dmesg outputs are about and why Serge has renamed the bug report. Your posts say you are having problem with both which seems odd and not possible? -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1392504 Title: libvirt not relabeling devices on USB Passthrough Status in QEMU: New Status in libvirt package in Ubuntu: Triaged Bug description: After upgrading from Ubuntu 14.04 to Ubuntu 14.10 USB passthrough in QEMU (version is now 2.1.0 - Debian2.1+dfsg-4ubuntu6.1) is not working any more. Already tried to remove and attach the USB devices. I use 1 USB2 HDD + 1 USB3 HDD to a virtual linux machine; 1 USB2 HDD to a virual FNAS machine and a USB 2camera to virtual Win7 machine. All these devices are not working any more. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1392504/+subscriptions
