veeam backup error: Failed to execute IOCTL_BLK_SNAP_VERSION

- modinfo veeamblksnap ``` filename: /lib/modules/6.17.2-2-pve/kernel/drivers/block/veeamblksnap.ko supported: external license: GPL author: Veeam Software Group GmbH version: 7.0.0.0 description: Block Device Snapshots Module srcversion: 9869C12761ACB09DD547B33 depends: bdevfilter name: veeamblksnap retpoline: Y vermagic: 6.17.2-2-pve SMP preempt mod_unload modversions parm: tracking_block_minimum_shift:The power of 2 for minimum tracking block size (uint) parm: tracking_block_maximum_count:The maximum number of tracking blocks (uint) parm: tracking_block_maximum_shift:The power of 2 for maximum trackings block size (uint) parm: chunk_minimum_shift:The power of 2 for minimum chunk size (uint) parm: chunk_maximum_count_shift:The power of 2 for maximum number of chunks (uint) parm: chunk_maximum_shift:The power of 2 for maximum snapshots chunk size (uint) parm: chunk_maximum_in_queue:The maximum number of chunks in store queue (uint) parm: diff_storage_minimum:The minimum allowable size of the difference storage in sectors (uint) ``` - modinfo bdevfilter ``` filename: /lib/modules/6.17.2-2-pve/kernel/drivers/block/bdevfilter.ko supported: external license: GPL author: Veeam Software Group GmbH version: 7.0.0.0 description: Block Device Filter kernel module srcversion: BBECE75D0E68A4C717BD01A depends: name: bdevfilter retpoline: Y vermagic: 6.17.2-2-pve SMP preempt mod_unload modversions ``` - lsmod | egrep "bdevfilter|veeam" ``` veeamblksnap 151552 0 bdevfilter 98304 1 veeamblksnap ``` veeam backup: ``` 17:11:30 [error] Failed to create volume snapshot 00:00:01 17:11:31 [error] Failed to take volume snapshot 17:11:31 [error] Failed to perform backup 17:11:31 [error] Inappropriate ioctl for device 17:11:31 [error] Failed to execute IOCTL_BLK_SNAP_VERSION 17:11:31 [error] Processing finished with errors at 2025-11-28 14:11:31 UTC ```