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Instance snapshot failures when using 'KvmFileBasedStorageVmSnapshotStrategy' #14481
Description
problem
Instance snapshots fail to create and also fail to delete; further, it becomes unable to destroy the Instance altogether.
| setting | value |
|---|---|
| `vmSnapshot.strategies.exclude` | `StorageVMSnapshotStrategy,DefaultVMSnapshotStrategy` |
| `kvm.vmstoragesnapshot.enabled` | `false` |
| `vmsnapshot.max` | `10` (default) |
versions
4.22.1.1
The steps to reproduce the bug
- A running KVM instance on NFS primary storage, no volume snapshots, no Instance Snapshots.
- Stop the QEMU guest agent inside the guest (or use a guest that has none installed).
- As the owning user:
createVMSnapshot virtualmachineid=<vm> snapshotmemory=false quiescevm=true
→ fails (expected — quiesce needs the agent). listVMSnapshot virtualmachineid=<vm>→ the attempt is listed withstate: Error.deleteVMSnapshot vmsnapshotid=failed vmsnapshotid(as the user, and again as root admin) →Failed to delete Instance Snapshot.destroyVirtualMachine id=<vm> expunge=true(root admin) →Failed to destroy vm with specified vmId;
the instance ends upStopped, not destroyed.
Retrying step 3 with quiescevm=false succeeds, so the snapshot capability itself is fine — only
the failed attempt's Instance snapshot is orphaned.
What to do about it?
The failure scenario should be either fixed or handled gracefully
Activity
YanChii commentedon Oct 23, 2026
Hi.
Some context that may help when fixing this:
Jan