PVE: Failed to clear resources from previous backups

[MaPf]

Hi all,

since yesterday we are getting an error on all PVE Backups:
01.07.2025 09:55:23 :: <servername>: Failed to perform backup: Failed to clear resources from previous backups


there were some minor updates installed on PVE beforehand:
2025-06-30 10:54:58 status installed libicu72:amd64 72.1-3+deb12u1
2025-06-30 10:55:01 status installed ca-certificates:all 20230311+deb12u1
2025-06-30 10:55:01 status installed libtpms0:amd64 0.9.7+pve1
2025-06-30 10:55:01 status installed libxml2:amd64 2.9.14+dfsg-1.3~deb12u2
2025-06-30 10:55:04 status installed man-db:amd64 2.11.2-2
2025-06-30 10:55:04 status installed libc-bin:amd64 2.36-9+deb12u10
2025-06-30 10:55:05 status installed ca-certificates:all 20230311+deb12u1

from the logfile I can see the following errors:

Code: Select all

2025-07-01 06:46:55.7225 00006 [1518] INFO  | [SshClientExtensions]: Successfully created the shell stream
2025-07-01 06:46:55.7263 00006 [1518] INFO  | [SshClientExtensions]: Executing the following SSH command with sudo using the shell stream: "pvesh get storage/plx_pve_nfs2 --output json"
2025-07-01 06:46:56.3376 00006 [1518] INFO  | [SnapshotFileManager]: Failed to obtain the storage path: Newtonsoft.Json.JsonReaderException: Error parsing undefined value. Path '', line 1, position 1.
2025-07-01 06:46:56.3376 00006 [1518] INFO  | [SnapshotFileManager]:    at Newtonsoft.Json.JsonTextReader.ParseUndefined()
2025-07-01 06:46:56.3376 00006 [1518] INFO  | [SnapshotFileManager]:    at Newtonsoft.Json.JsonTextReader.ParseValue()
2025-07-01 06:46:56.3376 00006 [1518] INFO  | [SnapshotFileManager]:    at Newtonsoft.Json.Linq.JObject.Load(JsonReader reader, JsonLoadSettings settings)
2025-07-01 06:46:56.3376 00006 [1518] INFO  | [SnapshotFileManager]:    at Newtonsoft.Json.Linq.JObject.Parse(String json, JsonLoadSettings settings)
2025-07-01 06:46:56.3376 00006 [1518] INFO  | [SnapshotFileManager]:    at Newtonsoft.Json.Linq.JObject.Parse(String json)
2025-07-01 06:46:56.3376 00006 [1518] INFO  | [SnapshotFileManager]:    at Veeam.Vbf.BackupAgent.BackupProxmox.Utils.SnapshotFileManager.GetStoragePath(String storageName)
2025-07-01 06:46:56.3421 00006 [1518] ERROR | [NbdEngine]: "Failed to clear resources from previous backups": Newtonsoft.Json.JsonReaderException: Error parsing undefined value. Path '', line 1, position 1.
2025-07-01 06:46:56.3421 00006 [1518] ERROR | [NbdEngine]:    at Newtonsoft.Json.JsonTextReader.ParseUndefined()
2025-07-01 06:46:56.3421 00006 [1518] ERROR | [NbdEngine]:    at Newtonsoft.Json.JsonTextReader.ParseValue()
2025-07-01 06:46:56.3421 00006 [1518] ERROR | [NbdEngine]:    at Newtonsoft.Json.Linq.JObject.Load(JsonReader reader, JsonLoadSettings settings)
2025-07-01 06:46:56.3421 00006 [1518] ERROR | [NbdEngine]:    at Newtonsoft.Json.Linq.JObject.Parse(String json, JsonLoadSettings settings)
2025-07-01 06:46:56.3421 00006 [1518] ERROR | [NbdEngine]:    at Newtonsoft.Json.Linq.JObject.Parse(String json)
2025-07-01 06:46:56.3421 00006 [1518] ERROR | [NbdEngine]:    at Veeam.Vbf.BackupAgent.BackupProxmox.Utils.SnapshotFileManager.GetStoragePath(String storageName)
2025-07-01 06:46:56.3421 00006 [1518] ERROR | [NbdEngine]:    at Veeam.Vbf.BackupAgent.BackupProxmox.Utils.SnapshotFileManager.DeleteSnapshotFile(Int32 vmId, BlockDevice device, String sessionId, String deviceStorageName, String defaultSnapshotStorageName, Func`2 checkStorageEnabled)
2025-07-01 06:46:56.3421 00006 [1518] ERROR | [NbdEngine]:    at Veeam.Vbf.BackupAgent.BackupProxmox.Utils.ResourceCleaner.CleanStorageAsync(Int32 vmId, VmBackupParams vmBackupParams, Func`2 checkStorageEnabled, CancellationToken cancellationToken)
2025-07-01 06:46:56.3421 00006 [1518] ERROR | [NbdEngine]:    at Veeam.Vbf.BackupAgent.BackupProxmox.Engine.NbdBackupEngine.CleanResourcesFromPreviousRunsAsync(Int32 vmId, String jobId, CancellationToken cancellationToken)
2025-07-01 06:46:56.3460 00006 [1518] INFO  | [QmpCommands]: Stopping the NBD server...

There is an open case 07749688

Does anybody have an idea, whats up?

[MaPf]

It turned out there was an invalid user in the Domain sync which caused the veeam-worker to receive some extra lines from a script command that coulnd't be interpreted and caused the backup to fail.
After deleting the user backups ran fine again.

[TFC253]

Can you explain in some detail? I'm having the same issue. We are very new to Proxmox and are trying it out as an alternative to VMware.