@stephane-m-dev that happens again for 1 vm.

    {
      "data": {
        "type": "VM",
        "id": "316e7303-c9c9-9bb6-04ef-83948ee1b19e",
        "name_label": "name"
      },
      "id": "1732299284886",
      "message": "backup VM",
      "start": 1732299284886,
      "status": "failure",
      "tasks": [
        {
          "id": "1732299284997",
          "message": "clean-vm",
          "start": 1732299284997,
          "status": "failure",
          "warnings": [
            {
              "data": {
                "path": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241101T181520Z.alias.vhd",
                "error": {
                  "generatedMessage": true,
                  "code": "ERR_ASSERTION",
                  "actual": false,
                  "expected": true,
                  "operator": "=="
                }
              },
              "message": "VHD check error"
            },
            {
              "data": {
                "alias": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241101T181520Z.alias.vhd"
              },
              "message": "missing target of alias"
            }
          ],
          "end": 1732299341663,
          "result": {
            "code": "ERR_INVALID_ARG_TYPE",
            "message": "The \"paths[1]\" argument must be of type string. Received undefined",
            "name": "TypeError",
            "stack": "TypeError [ERR_INVALID_ARG_TYPE]: The \"paths[1]\" argument must be of type string. Received undefined\n    at resolve (node:path:1169:7)\n    at normalize (/opt/xo/xo-builds/xen-orchestra-202411191133/@xen-orchestra/fs/dist/path.js:21:27)\n    at NfsHandler.__unlink (/opt/xo/xo-builds/xen-orchestra-202411191133/@xen-orchestra/fs/dist/abstract.js:412:32)\n    at NfsHandler.unlink (/opt/xo/xo-builds/xen-orchestra-202411191133/node_modules/limit-concurrency-decorator/index.js:97:24)\n    at checkAliases (file:///opt/xo/xo-builds/xen-orchestra-202411191133/@xen-orchestra/backups/_cleanVm.mjs:132:25)\n    at async Array.<anonymous> (file:///opt/xo/xo-builds/xen-orchestra-202411191133/@xen-orchestra/backups/_cleanVm.mjs:284:5)\n    at async Promise.all (index 1)\n    at async RemoteAdapter.cleanVm (file:///opt/xo/xo-builds/xen-orchestra-202411191133/@xen-orchestra/backups/_cleanVm.mjs:283:3)"
          }
        },
        {
          "id": "1732299285125",
          "message": "clean-vm",
          "start": 1732299285125,
          "status": "failure",
          "warnings": [
            {
              "data": {
                "path": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241101T181520Z.alias.vhd",
                "error": {
                  "generatedMessage": true,
                  "code": "ERR_ASSERTION",
                  "actual": false,
                  "expected": true,
                  "operator": "=="
                }
              },
              "message": "VHD check error"
            },
            {
              "data": {
                "alias": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241101T181520Z.alias.vhd"
              },
              "message": "missing target of alias"
            }
          ],
          "end": 1732299343111,
          "result": {
            "code": "ERR_INVALID_ARG_TYPE",
            "message": "The \"paths[1]\" argument must be of type string. Received undefined",
            "name": "TypeError",
            "stack": "TypeError [ERR_INVALID_ARG_TYPE]: The \"paths[1]\" argument must be of type string. Received undefined\n    at resolve (node:path:1169:7)\n    at normalize (/opt/xo/xo-builds/xen-orchestra-202411191133/@xen-orchestra/fs/dist/path.js:21:27)\n    at NfsHandler.__unlink (/opt/xo/xo-builds/xen-orchestra-202411191133/@xen-orchestra/fs/dist/abstract.js:412:32)\n    at NfsHandler.unlink (/opt/xo/xo-builds/xen-orchestra-202411191133/node_modules/limit-concurrency-decorator/index.js:97:24)\n    at checkAliases (file:///opt/xo/xo-builds/xen-orchestra-202411191133/@xen-orchestra/backups/_cleanVm.mjs:132:25)\n    at async Array.<anonymous> (file:///opt/xo/xo-builds/xen-orchestra-202411191133/@xen-orchestra/backups/_cleanVm.mjs:284:5)\n    at async Promise.all (index 3)\n    at async RemoteAdapter.cleanVm (file:///opt/xo/xo-builds/xen-orchestra-202411191133/@xen-orchestra/backups/_cleanVm.mjs:283:3)"
          }
        },
        {
          "id": "1732299343953",
          "message": "snapshot",
          "start": 1732299343953,
          "status": "success",
          "end": 1732299346495,
          "result": "ee646d05-83b2-31d8-e54b-0d3b0cf7df1d"
        },
        {
          "data": {
            "id": "4b6d24a3-0b1e-48d5-aac2-a06e3a8ee485",
            "isFull": false,
            "type": "remote"
          },
          "id": "1732299346495:0",
          "message": "export",
          "start": 1732299346495,
          "status": "success",
          "tasks": [
            {
              "id": "1732299353253",
              "message": "transfer",
              "start": 1732299353253,
              "status": "success",
              "end": 1732299450434,
              "result": {
                "size": 9674571776
              }
            },
            {
              "id": "1732299501828:0",
              "message": "clean-vm",
              "start": 1732299501828,
              "status": "success",
              "warnings": [
                {
                  "data": {
                    "parent": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241101T181520Z.alias.vhd",
                    "child": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241102T180758Z.alias.vhd"
                  },
                  "message": "parent VHD is missing"
                },
                {
                  "data": {
                    "parent": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241102T180758Z.alias.vhd",
                    "child": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241103T180648Z.alias.vhd"
                  },
                  "message": "parent VHD is missing"
                },
                {
                  "data": {
                    "parent": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241103T180648Z.alias.vhd",
                    "child": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241104T180802Z.alias.vhd"
                  },
                  "message": "parent VHD is missing"
                },
                {
                  "data": {
                    "parent": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241104T180802Z.alias.vhd",
                    "child": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241105T181019Z.alias.vhd"
                  },
                  "message": "parent VHD is missing"
                },
                {
                  "data": {
                    "backup": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/20241104T180802Z.json",
                    "missingVhds": [
                      "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241104T180802Z.alias.vhd"
                    ]
                  },
                  "message": "some VHDs linked to the backup are missing"
                },
                {
                  "data": {
                    "backup": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/20241102T180758Z.json",
                    "missingVhds": [
                      "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241102T180758Z.alias.vhd"
                    ]
                  },
                  "message": "some VHDs linked to the backup are missing"
                },
                {
                  "data": {
                    "backup": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/20241103T180648Z.json",
                    "missingVhds": [
                      "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241103T180648Z.alias.vhd"
                    ]
                  },
                  "message": "some VHDs linked to the backup are missing"
                },
                {
                  "data": {
                    "backup": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/20241105T181019Z.json",
                    "missingVhds": [
                      "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241105T181019Z.alias.vhd"
                    ]
                  },
                  "message": "some VHDs linked to the backup are missing"
                }
              ],
              "end": 1732299518747,
              "result": {
                "merge": false
              }
            }
          ],
          "end": 1732299518760
        },
        {
          "data": {
            "id": "8da40b08-636f-450d-af15-3264b9692e1f",
            "isFull": false,
            "type": "remote"
          },
          "id": "1732299346496",
          "message": "export",
          "start": 1732299346496,
          "status": "success",
          "tasks": [
            {
              "id": "1732299353244",
              "message": "transfer",
              "start": 1732299353244,
              "status": "success",
              "end": 1732299450546,
              "result": {
                "size": 9674571776
              }
            },
            {
              "id": "1732299451765",
              "message": "clean-vm",
              "start": 1732299451765,
              "status": "success",
              "warnings": [
                {
                  "data": {
                    "parent": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241101T181520Z.alias.vhd",
                    "child": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241102T180758Z.alias.vhd"
                  },
                  "message": "parent VHD is missing"
                },
                {
                  "data": {
                    "parent": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241102T180758Z.alias.vhd",
                    "child": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241103T180648Z.alias.vhd"
                  },
                  "message": "parent VHD is missing"
                },
                {
                  "data": {
                    "parent": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241103T180648Z.alias.vhd",
                    "child": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241104T180802Z.alias.vhd"
                  },
                  "message": "parent VHD is missing"
                },
                {
                  "data": {
                    "parent": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241104T180802Z.alias.vhd",
                    "child": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241105T181019Z.alias.vhd"
                  },
                  "message": "parent VHD is missing"
                },
                {
                  "data": {
                    "backup": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/20241103T180648Z.json",
                    "missingVhds": [
                      "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241103T180648Z.alias.vhd"
                    ]
                  },
                  "message": "some VHDs linked to the backup are missing"
                },
                {
                  "data": {
                    "backup": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/20241104T180802Z.json",
                    "missingVhds": [
                      "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241104T180802Z.alias.vhd"
                    ]
                  },
                  "message": "some VHDs linked to the backup are missing"
                },
                {
                  "data": {
                    "backup": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/20241102T180758Z.json",
                    "missingVhds": [
                      "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241102T180758Z.alias.vhd"
                    ]
                  },
                  "message": "some VHDs linked to the backup are missing"
                },
                {
                  "data": {
                    "backup": "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/20241105T181019Z.json",
                    "missingVhds": [
                      "/xo-vm-backups/316e7303-c9c9-9bb6-04ef-83948ee1b19e/vdis/90d0b5ca-9364-4011-adc4-b8c74a534da9/53843891-126f-4f0c-b645-8e8aa0a41b36/20241105T181019Z.alias.vhd"
                    ]
                  },
                  "message": "some VHDs linked to the backup are missing"
                }
              ],
              "end": 1732299501791,
              "result": {
                "merge": false
              }
            }
          ],
          "end": 1732299501828
        }
      ],
      "infos": [
        {
          "message": "Transfer data using NBD"
        }
      ],
      "end": 1732299518760
    }
  ],
  "end": 1732299518761
}

@WayneSherman I have Windows running on XCP 8.3 with XT 9.4 and things have been fine. Also I have not seen this issue (ever) on my 8.2 hosts.

I have seen this mouse issue on a different XCP 8.3 test machine with windows guests (Win10 and Server 2022). It seemed to happen when I made network changes on the host for the guest. I thought the guest locked up but it was just the mouse (KB still worked). I did not do any additional testing then, but I can leave it running for a while and see what happens.

I don't see this as an XO problem as I use the same XO for other hosts/guests that don't have a problem.

Having good backups of your VMs would be a smart choice before proceeding.

I confirm this behavior. Checking with the dev team to see if this is by design.

Did you follow the documentation for running as a non-root user?

https://docs.xen-orchestra.com/installation#sudo

@stephane-m-dev for now it single error.