*** This bug is a duplicate of bug 1756915 ***
    https://bugs.launchpad.net/bugs/1756915

I'm seeing the same issue. I have a k/b and mouse switch, switching
inputs causes it to crash as well. The USB switch has 3 devices hooked
in: 1. KB 2. Mouse 3. Logitech G430 headset.

I see the following in the logs:

grep libvirt /var/log/syslog


Aug  8 23:42:16 uranis libvirtd[1124]: 2018-08-09 06:42:16.085+0000: 1124: 
error : virNetSocketReadWire:1811 : End of file while reading data: 
Input/output error
Aug  8 23:49:09 uranis libvirtd[1124]: 2018-08-09 06:49:09.055+0000: 1124: 
error : virNetSocketReadWire:1811 : End of file while reading data: 
Input/output error
Aug  8 23:49:12 uranis libvirtd[1124]: 2018-08-09 06:49:12.720+0000: 1124: 
error : virNetSocketReadWire:1811 : End of file while reading data: 
Input/output error
Aug  8 23:50:02 uranis libvirtd[1124]: 2018-08-09 06:50:02.227+0000: 1124: 
error : virNetSocketReadWire:1811 : End of file while reading data: 
Input/output error
Aug  9 00:05:15 uranis libvirtd[1124]: 2018-08-09 07:05:15.163+0000: 1124: 
error : virNetSocketReadWire:1811 : End of file while reading data: 
Input/output error

A reboot clears the issue out temporarily.

apt policy libvirt-bin 
libvirt-bin:
  Installed: 4.0.0-1ubuntu8.3
  Candidate: 4.0.0-1ubuntu8.3
  Version table:
 *** 4.0.0-1ubuntu8.3 500
        500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages

Let me know if you need me to get anything else from the system. Thanks.

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https://bugs.launchpad.net/bugs/1756918

Title:
  libvirt crashes when attaching usb device

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