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-
-[Qemu-devel]  [BUG] qemu stuck when detach host-usb device
-
-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?
-
-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
-
->
------Original Message-----
->
-From: Gerd Hoffmann [
-mailto:address@hidden
->
-Sent: Tuesday, November 27, 2018 2:09 PM
->
-To: linzhecheng <address@hidden>
->
-Cc: address@hidden; wangxin (U) <address@hidden>;
->
-Zhoujian (jay) <address@hidden>; address@hidden
->
-Subject: Re: [Qemu-devel] [BUG] qemu stuck when detach host-usb device
->
->
-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.
-Perhaps it's usb driver's bug. Could you also reproduce it?
->
->
-cheers,
->
-Gerd
-