Quoting Bill Mills ([email protected]):
> This feature appears to cause a bug.
> To reproduce attach-device to a virtual machine and then stop that vm
> Start another vm and try to attach-device to that machine
> I get:
> virsh attach-device vm1 /var/lib/libvirt/hotplug/usb-serial.xml
> error: Failed to attach device from /var/lib/libvirt/hotplug/usb-serial.xml
> error: Requested operation is not valid: USB device 002:005 is in use by 
> domain ..
> 
> usb-serial:
>     <hostdev mode='subsystem' type='usb' managed='yes'>
>       <source>
>         <vendor id='0x067b'/>
>         <product id='0x2303'/>
>       </source>
>     </hostdev>
> 
> backing up libvirt0 and libvirt-bin to 0.9.8-2ubuntu17.7 makes this
> problem go away.
> 
> While looking at this I found a Fedora bug that looks similar.  The upstream 
> patches they identified may be of interest.
> https://bugzilla.redhat.com/show_bug.cgi?id=814866

Could you please open a new bug for this?  We can't re-use
this bug for a new SRU of new patches.

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https://bugs.launchpad.net/bugs/1082213

Title:
  libvirt: When installing two or more identical usb devices in a VM,
  only one works

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