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+++ This bug was initially created as a clone of Bug #2039136 +++

Description of problem:
 Snapshot-revert failed with 'cause is unknown' error

Version-Release number of selected component (if applicable):
libvirt-8.0.0-0rc1.1.el9.x86_64
qemu-kvm-6.2.0-3.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Prepare a shutoff domain
# virsh snapshot-create-as vm  s1
Domain snapshot s1 created

2.# virsh edit vm  (e.g. remove rng device in xml)
Domain 'vm' XML configuration edited.

3.# virsh snapshot-create-as vm  s2
Domain snapshot s2 created

4. # virsh snapshot-revert vm s1
error: An error occurred, but the cause is unknown

Actual results:


Expected results:
Should succeed

Additional info:
Not reproduced in libvirt-7.10.0-1.el9.x86_64

--- Additional comment from Ján Tomko on 2022-01-20 15:18:26 CET ---

Fixed upstream by:
commit 76deb656132bb8817ddae4b7f417930c4db824c9
Author:     Ján Tomko <jtomko>
CommitDate: 2022-01-20 15:16:18 +0100

    qemu: fix inactive snapshot revert

git describe: v8.0.0-124-g76deb65613

Preverify on:
libvirt: v8.0.0-130-g2b7f9506b1
qemu-6.2.0-2.fc36.x86_64
qemu-kvm-6.2.0-2.fc36.x86_64

preverify info pls refer to https://bugzilla.redhat.com/show_bug.cgi?id=2039136

Verified on libvirt-8.0.0-2.module+el8.6.0+14025+ca131e0a.x86_64

# rpm -q libvirt qemu-kvm
libvirt-8.0.0-2.module+el8.6.0+14025+ca131e0a.x86_64
qemu-kvm-6.2.0-5.module+el8.6.0+14025+ca131e0a.x86_64

# virsh list --inactive
 Id   Name         State
-----------------------------
 -    qcow2_test   shut off

# virsh snapshot-create-as qcow2_test s1
Domain snapshot s1 created

# virsh edit vm1
error: failed to get domain 'vm1'

# virsh edit qcow2_test
Domain 'qcow2_test' XML configuration edited.

# virsh snapshot-create-as qcow2_test s2
Domain snapshot s2 created

# virsh snapshot-revert qcow2_test s1


# virsh start qcow2_test
Domain 'qcow2_test' started

# virsh snapshot-revert qcow2_test s2

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2022:1759