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Bug 1733173

Summary:	Can't revert the domain to the special snapshot
Product:	Red Hat Enterprise Linux Advanced Virtualization	Reporter:	Meina Li <meili>
Component:	libvirt	Assignee:	Peter Krempa <pkrempa>
Status:	CLOSED DUPLICATE	QA Contact:	yisun
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	8.1	CC:	chwen, dyuan, fjin, hhan, jgao, lmen, pkrempa, xuzhang, yisun
Target Milestone:	rc	Keywords:	Regression, Triaged
Target Release:	8.1
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-03-17 18:05:51 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Meina Li 2019-07-25 10:23:53 UTC

Description of problem:
Can't revert the domain to the special snapshot

Version-Release number of selected component (if applicable):
libvirt-5.5.0-1.module+el8.1.0+3580+d7f6488d.x86_64
kernel-4.18.0-107.el8.x86_64
qemu-kvm-4.0.0-5.module+el8.1.0+3622+5812d9bf.x86_64

How reproducible:
100%

Steps to Reproduce:

1. Prepare a running domain lmn.

2. Create the following snapshot.

# virsh snapshot-create-as lmn snap1
Domain snapshot snap1 created

# virsh snapshot-create-as lmn snap2
Domain snapshot snap2 created

# virsh snapshot-create-as lmn snap3 --disk-only
Domain snapshot snap3 created

# virsh snapshot-list lmn 
 Name         Creation Time               State
---------------------------------------------------------
 snap1   2019-07-25 05:44:03 -0400   running
 snap2   2019-07-25 05:44:15 -0400   running
 snap3   2019-07-25 05:44:55 -0400   disk-snapshot

3. Revert the domain to snap1.
# virsh snapshot-revert lmn snap1
error: operation failed: Failed to load snapshot: Error: Device 'drive-virtio-disk0' does not have the requested snapshot 'snap1'

Actual results:
Can't revert the domain to the special snapshot

Expected results:
Should revert the domain to the special snapshot successfully

Additional info:

Comment 1 Peter Krempa 2020-03-17 18:05:51 UTC


*** This bug has been marked as a duplicate of bug 880565 ***

Comment 2 Han Han 2020-09-22 03:41:38 UTC

Hello, the problem is reproduced on latest libvirt but the error is different
Version:
libvirt-6.6.0-6.module+el8.3.0+8125+aefcf088.x86_64
qemu-kvm-5.1.0-9.module+el8.3.0+8182+ac9ced32.x86_64

Steps:
➜  ~ virsh list
 Id   Name   State
----------------------
 1    new    running
➜  ~ virsh snapshot-create-as 1 s1
Domain snapshot s1 created
➜  ~ virsh snapshot-create-as 1 s2 --disk-only 
Domain snapshot s2 created
➜  ~ virsh snapshot-revert 1 s1
 error: operation failed: Failed to load snapshot: Error: Device '' does not have the requested snapshot 's1'
➜  ~ virsh snapshot-list 1
 Name   Creation Time               State
---------------------------------------------------
 s1     2020-09-21 23:22:43 -0400   running
 s2     2020-09-21 23:22:53 -0400   disk-snapshot

The domain xml: http://paste.openstack.org/raw/798187/
The libvirtd log: http://paste.openstack.org/raw/798188/

Is it a valid scenario to use the internal and external snapshots together? If not, could you please provide a short explanation?

Comment 3 Peter Krempa 2020-09-22 06:50:50 UTC

It semantically may make sense but there are problems in the current implementation.