Comment 3 for bug 1930398

Thank you for your reply，I use the virt-manager and centos7 iso. ubuntu iso will not trigger this
1.attach a centos7 minimal iso.
2.set the boot options cdrom first boot device.
3.start vm ,and install centos 7 ,last step of installtion , is press reboot
4.vm will boot from iso again.
5.then ,detach iso with virt-manager
#tail -f /var/log/syslog
internal error: unable to execute QEMU command 'blockdev-remove-medium': Tray of device 'sata0-0-0' is not open