What were you trying to do that didn't work?

Attempting to revert a running  virtual machine to an internal snapshot using the virsh snapshot-revert command.

Package NVR for which the bug is seen:

• libvirt: libvirt-11.3.0-1.el10.x86_64/aarch64
• qemu-kvm: qemu-kvm-10.0.0-5.el10.x86_64/aarch64
• kernel: kernel-6.12.0-89.el10.x86_64/aarch64

Architectures Affected:

• aarch64
• x86_64

How reproducible is this bug?:

100%
Steps to reproduce:

Create a virtual machine with a single disk of multiple disk
Start the virtual machine.
Create a live internal snapshot of the running VM. (Command: virsh snapshot-create-as --domain <vm_name> --name <snapshot_name> --live --disk-only)
Attempt to revert the VM to the created internal snapshot. (Command: virsh snapshot-revert --domain <vm_name> --snapshotname <snapshot_name>)
Expected Results:

The virtual machine should successfully revert to the specified live internal snapshot.

Actual Results:

The virsh snapshot-revert command fails with the following error:

error: operation failed: load of internal snapshot 'libvirt-2-format job failed: Device 'libvirt-2-format is writable but does not support snapshots.
Additional Information:

This error consistently occurs even in a minimal, single-disk VM configuration, indicating that the issue is not related to multi-disk complexities.
Debugging analysis of libvirtd.log confirms that this is a non-fatal error reported by the QEMU process back to libvirtd via a QMP (QEMU Monitor Protocol) message during the snapshot-load job.
The QEMU process itself does not crash; it continues to run.

libvirt2disk.txt

libvirt1disk.txt