Hi Mohammad,
I'll to recreate your issue, but while that goes on I already would want to ask 
if you could report the following tracked while you try to detach the device:

1. host dmesg -w
2. journalctl -f
3. /var/log/libvirt/qemu/<questname>.log

Please report all these in case there is something that helps to
pinpoint the root cause.

Could you also please try more devices to know which kind this issue it 
restricted to?
1. try other VFs on the same device
2. try VFs on a different device (if you have any)
3. try non-VF but full PCI passthrough

Does the issue occor on your system for all of these ?

** Changed in: libvirt (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1867519

Title:
  libvirt 6.0 : virtual machine stuck when detaching PCI device using
  virsh command

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