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I can reproduce this issue with package:
virt-viewer-7.0-1.el8.x86_64
Steps:
1. Have a usb device attached to your host, such as sdb
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk
├─sda1 8:1 0 250G 0 part
...
sdb 8:16 1 28.9G 0 disk
├─sdb1 8:17 1 6.6G 0 part /run/media/juzhou/RHEL-8-0-0-BaseOS-x86_64
└─sdb2 8:18 1 9.7M 0 part
2. Prepare a spice vm and start it.
3. Use virt-viewer to open vm.
$ virt-viewer -c qemu:///system spice
4. In virt-viewer menu bar, select "File"->"USB device selection", check the usb device you want to plug into vm and click "close" button.
check vm: usb device is added, here is "vda"
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 1 28.9G 0 disk
├─sda1 8:1 1 6.6G 0 part /run/media/root/RHEL-8-0-0-BaseOS-x86_64
└─sda2 8:2 1 9.7M 0 part
vda 252:0 0 10G 0 disk
├─vda1 252:1 0 1G 0 part /boot
└─vda2 252:2 0 9G 0 part
├─rhel-root 253:0 0 8G 0 lvm /
└─rhel-swap 253:1 0 1G 0 lvm [SWAP]
check host by "lsblk": usb device "sdb" is not showing
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk
├─sda1 8:1 0 250G 0 part
├─sda2 8:2 0 10G 0 part
│ └─rhel-swap 253:0 0 10G 0 lvm
├─sda3 8:3 0 5.8G 0 part
│ └─rhel00-swap 253:1 0 5.8G 0 lvm [SWAP]
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 150G 0 part /
5. Shutdown vm by "virsh destroy spice" command, and check on host again.
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk
├─sda1 8:1 0 250G 0 part
├─sda2 8:2 0 10G 0 part
│ └─rhel-swap 253:0 0 10G 0 lvm
├─sda3 8:3 0 5.8G 0 part
│ └─rhel00-swap 253:1 0 5.8G 0 lvm [SWAP]
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 150G 0 part /
Result: sdb can not be used by host again.
Then try to verify this bug with new build:
virt-viewer-7.0-5.el8.x86_64
spice-gtk3-0.37-1.el8.x86_64
Steps:
a. Loop reproduce step1-5.
Result:After step5, shutdown vm, then usb device can be added to host again.
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk
├─sda1 8:1 0 250G 0 part
├─sda2 8:2 0 10G 0 part
│ └─rhel-swap 253:0 0 10G 0 lvm
├─sda3 8:3 0 5.8G 0 part
│ └─rhel00-swap 253:1 0 5.8G 0 lvm [SWAP]
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 150G 0 part /
sdb 8:16 1 28.9G 0 disk
├─sdb1 8:17 1 6.6G 0 part /run/media/juzhou/RHEL-8-0-0-BaseOS-x86_64
└─sdb2 8:18 1 9.7M 0 part
b. I also do additional testing about different quit ways from virt-viewer after looping reproduce step1-4.
b.1 Click File->Quit
Result: usb device can be added to host again.
b.2 Click View->Displays->Display 1
Result: usb device can be added to host again.
b.3 Cick the "X" button on the top right corner of the window.
Result: usb device can be added to host again.
b.4 Use Ctrl+c to quit from virt-viewer command.
# virt-viewer spice
^C
Result: usb device can not be added to host, it's the same issue with Bug 1713311 I filed on rhel7 before
As a summary of my verification, usb device can be used by host again when I shutdown vm or use normal ways to quit from virt-viewer.
But it failed to used by host again when quitting from virt-viewer by Ctrl+C.
So Victor, could I clone a new bug on rhel8, or your team has other plan for Bug 1713311.
Waiting for your feedback, thanks.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2019:3478