rajujith opened a new issue, #11673:
URL: https://github.com/apache/cloudstack/issues/11673
### problem
When instance snapshots fail to create on KVM due to various reasons like '
Guest agent is not responding' or 'internal snapshots of a VM with pflash based
firmware require QCOW2 nvram format' the instance snapshot is created in
CloudStack in 'Error' state. This can be deleted while the instance is
'Running' but when the instance is in 'Stopped' state, the instance snapshot
deletion fails since the snapshot was never created in KVM.
On Management server:
```
2025-09-18 08:04:33,742 DEBUG [c.c.v.s.VMSnapshotManagerImpl]
(Work-Job-Executor-14:[ctx-d7ea3fce, job-59/job-60, ctx-c90903e0])
(logid:f78a6e3a) Failed to create vm snapshot: [VMSnapshot
{"id":2,"name":"i-2-6-VM_VS_20250918080427","uuid":"f5cadba9-b1ff-4436-8d34-0fb6768fcd29","vmId":6}]
due to: Creating VM snapshot: i-2-6-VM_VS_20250918080427 failed due to Create
VM snapshot failed due to org.libvirt.LibvirtException: Operation not
supported: internal snapshots of a VM with pflash based firmware require QCOW2
nvram format com.cloud.utils.exception.CloudRuntimeException: Creating VM
snapshot: i-2-6-VM_VS_20250918080427 failed due to Create VM snapshot failed
due to org.libvirt.LibvirtException: Operation not supported: internal
snapshots of a VM with pflash based firmware require QCOW2 nvram format
at
org.apache.cloudstack.storage.vmsnapshot.DefaultVMSnapshotStrategy.takeVMSnapshot(DefaultVMSnapshotStrategy.java:179)
```
KVM agent:
```
2025-09-18 08:05:49,263 DEBUG [utils.script.Script]
(AgentRequest-Handler-1:[]) (logid:) Executing command [/usr/bin/qemu-img
snapshot -d i-2-6-VM_VS_20250918080427
/mnt/a925cc72-8e60-3c29-b18c-0b8444608bd0/2296a6ae-87d5-4da0-89db-34e9f424576c
].
2025-09-18 08:05:49,274 WARN [utils.script.Script]
(AgentRequest-Handler-1:[]) (logid:) Execution of process [76592] for command
[/usr/bin/qemu-img snapshot -d i-2-6-VM_VS_20250918080427
/mnt/a925cc72-8e60-3c29-b18c-0b8444608bd0/2296a6ae-87d5-4da0-89db-34e9f424576c
] failed.
2025-09-18 08:05:49,274 DEBUG [utils.script.Script]
(AgentRequest-Handler-1:[]) (logid:) Exit value of process [76592] for command
[/usr/bin/qemu-img snapshot -d i-2-6-VM_VS_20250918080427
/mnt/a925cc72-8e60-3c29-b18c-0b8444608bd0/2296a6ae-87d5-4da0-89db-34e9f424576c
] is [1].
2025-09-18 08:05:49,274 WARN [utils.script.Script]
(AgentRequest-Handler-1:[]) (logid:) Process [76592] for command
[/usr/bin/qemu-img snapshot -d i-2-6-VM_VS_20250918080427
/mnt/a925cc72-8e60-3c29-b18c-0b8444608bd0/2296a6ae-87d5-4da0-89db-34e9f424576c
] encountered the error: [1].
```
Manual deletion attempt :
```
/usr/bin/qemu-img snapshot -d i-2-6-VM_VS_20250918080427
/mnt/a925cc72-8e60-3c29-b18c-0b8444608bd0/2296a6ae-87d5-4da0-89db-34e9f424576c
qemu-img: Could not delete snapshot 'i-2-6-VM_VS_20250918080427': snapshot
not found
```
```
mysql> select * from vm_snapshots where id=2\G
*************************** 1. row ***************************
id: 2
uuid: f5cadba9-b1ff-4436-8d34-0fb6768fcd29
name: i-2-6-VM_VS_20250918080427
display_name: sn2
description: sn2
vm_id: 6
account_id: 2
domain_id: 1
service_offering_id: 13
vm_snapshot_type: DiskAndMemory
state: Error
parent: NULL
current: NULL
update_count: 4
updated: 2025-09-18 08:05:49
created: 2025-09-18 08:04:28
removed: NULL
```
### versions
4.20.1
KVM
### The steps to reproduce the bug
1. Deploy a Windows instance where guest agent is not installed or configure
vtpm.
2. Create an instance snapshot with memory, it should fail.
3. Stop the instance
4. Delete the instance snapshot in 'Error' state.
### What to do about it?
Avoid creating an instance snapshot in 'Error' state or allow deletion.
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