On Tue, Nov 27, 2018 at 01:26:24AM +0000, linzhecheng wrote: > Description of problem: > The guest has a host-usb device(Kingston Technology DataTraveler 100 > G3/G4/SE9 G2), which is attached > to xhci controller(on host). Qemu will stuck if I detach it from guest. > > How reproducible: > 100% > > Steps to Reproduce: > 1. Use usb stick to copy files in guest , make it busy working. > 2. virsh detach-device vm_name usb.xml > > Then qemu will stuck for 20s, I found this is because > libusb_release_interface block for 20s. > Dmesg prints: > > [35442.034861] usb 4-2.1: Disable of device-initiated U1 failed. > [35447.034993] usb 4-2.1: Disable of device-initiated U2 failed. > [35452.035131] usb 4-2.1: Set SEL for device-initiated U1 failed. > [35457.035259] usb 4-2.1: Set SEL for device-initiated U2 failed. > > Is this a hardware error or software's bug?
I'd guess software error, could be is libusb or (host) linux kernel. Cc'ing libusb-devel. cheers, Gerd
