libvirt users - Jul 2022 - Eject CD ROM medium fails with 'Tray of device is not open'

Hi Guys,

I have hit an issue on testing against our testbed, It's failed to eject
cdrom media after reboot from installed the guest OS.

The reproduce step:


  1.   Attach a block device with a ISO media and start install VM from ISO.
  2.   <disk type='block' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source
dev='/dev/disk/by-id/pbdx-vol-cfe60dca-c271-491b-be3c-11fa8d7625a4'
index='6'/>
      <backingStore/>
      <target dev='hda' bus='ide' tray='open'/>
      <readonly/>
      <alias name='ide0-0-0'/>
      <address type='drive' controller='0' bus='0'
target='0' unit='0'/>
    </disk>
  3.  After installed the OS and reboot from system disk successful.
  4.  Then I want to eject CDROM through update device with the xml like below
or using virsh tool 'virsh change-media iso_test hda --eject'
  5.  All those will failed at "internal error: unable to execute QEMU
command 'blockdev-remove-medium': Tray of device 'ide0-0-0' is
not open"

<disk type='block' device='cdrom'>
   <driver name='qemu' type='raw'/>
      <backingStore/>
      <target dev='hda' bus='ide' tray='open'/>
      <readonly/>
      <alias name='ide0-0-0'/>
      <address type='drive' controller='0' bus='0'
target='0' unit='0'/>
</disk>

block info looks like below:
virsh qemu-monitor-command iso_test --hmp info block
setlocale: No such file or directory
libvirt-6-format: /dev/disk/by-id/pbdx-vol-cfe60dca-c271-491b-be3c-11fa8d7625a4
(raw, read-only)
    Attached to:      ide0-0-0
    Removable device: locked, tray closed
    Cache mode:       writeback

Reproduce envrionment:
     Operating system: rhat8.4
     Architecture:x86
     kernel version:4.18.0-305
     libvirt version:v7.9.0(private build)
     Hypervisor and version:QEMU 5.1.0(private build)

  Is there any workaround?  Any comments are appreciated.


  Thanks!
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On Mon, Jul 25, 2022 at 05:10:26AM +0000, liang chaojun
wrote:
> Hi Guys,
> 
> I have hit an issue on testing against our testbed, It's failed to
eject cdrom media after reboot from installed the guest OS.
Sounds like this one:
https://gitlab.com/qemu-project/qemu/-/issues/933

so it may we worth following up with it. If it's the same issue (from your
description it sure looks like it) then it is a race condition in the IDE
emulation in QEMU and we had to disable an upstream integration test in libvirt
for the suite to stop failing :(.

Regards,
Erik