[Pkg-libvirt-maintainers] Bug#1107399: Snapshot-revert is failing and shutting down the VM immediately

[Trupti]

Package: libvirt-daemon
Version: 11.3.0
Severity: important

`virsh snapshot-revert` is failing for snapshots of running VMs on 
Debian Trixie/Sid (powerpc64le), causing the VM to shut off.

The error is:
`error: load of internal snapshot 'snapshot_name' job failed: Device 
'libvirt-2-format' is writable but does not support snapshots`


System Details:
Host OS: Debian GNU/Linux trixie/sid (powerpc64le)
Kernel: 6.12.27-powerpc64le-64k
QEMU: 10.0.0 (Debian 1:10.0.0+ds-1)
Libvirt: libvirtd (libvirt) 11.3.0

Steps to reproduce
1) Create a Debian guest same as Host OS
2) Check VM is running and accessible.
2) Take a snapshot of a VM using following command. VM is still running 
after taking snapshot

#virsh snapshot-create vm
Domain snapshot snapshot_name created

3) Now do a snapshot-revert using the same snapshot created above. After 
taking snapshot guest is shutdown immediately.

#virsh snapshot-revert vm snapshot_name
error: Failed to revert snapshot 1748851900
error: operation failed: load of internal snapshot 'snapshot_name' job 
failed: Device 'libvirt-2-format' is writable but does not support 
snapshots

Expected Result:
The domain should successfully revert to snapshot snapshot_name

The upstream fix for this is available at:
https://gitlab.com/libvirt/libvirt/-/commit/889d2ae289cd95d612575ebc7a4e111ac33b0939
(Discussed further in: https://gitlab.com/libvirt/libvirt/-/issues/771)

This bug is fixed in the new release of libvirt package 11.4.0-1 as 
mentioned in the link 
https://libvirt.org/news.html#:~:text=floppies%20not%20work.-,Bug%20fixes,-qemu%3A%20Fix%20failure

To resolve this bug for Debian users, we propose applying the linked 
upstream fix to the libvirt package in Trixie/Sid, ensuring it carries 
forward to subsequent releases.

Thanks and Regards,
Trupti.