[DRBD-user] linstor-proxmox snapshots causes tainted kernel

[Greb]

Hello,

I continued my Proxmox / Drbd / Linstor tests on ThinLvm storage and now, have a problem with creating snapshots.
Whether the snapshot is created by the WebGUI for a vm or the shell for a test resource, this causes tainted kernel :

Nov 19 12:57:38 vpx3-1 kernel: Tainted: P O 4.15.18-8-pve # 1

[root at vpx3-1:~]# linstor snapshot create first snap1
SUCCESS:
Description:
    New snapshot 'snap1' of resource 'first' registered.
Details:
    Snapshot 'snap1' of resource 'first' UUID is: f7c923ab-604f-47bf-80d0-f54f4652a968
SUCCESS:
    Suspended IO of 'first' on 'vpx3-1' for snapshot
SUCCESS:
    Suspended IO of 'first' on 'vpx3-2' for snapshot
ERROR:
    (Node: 'vpx3-2') Storage configuration exception
ERROR:
    (Node: 'vpx3-1') Storage configuration exception
ERROR:
    (Node: 'vpx3-2') Storage configuration exception
ERROR:
    (Node: 'vpx3-1') Storage configuration exception
 
[root at vpx3-1:~]# linstor snapshot l
╭───────────────────────────────────────────────────────────────────╮
┊ ResourceName ┊ SnapshotName ┊ NodeNames      ┊ Volumes   ┊ State  ┊
╞┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄╡
┊ first        ┊ snap1        ┊ vpx3-1, vpx3-2 ┊ 0: 10 MiB ┊ Failed ┊
╰───────────────────────────────────────────────────────────────────╯

Nov 19 12:52:45 vpx3-1 Satellite[976]: 12:52:45.686 [StltWorkerPool_0003] ERROR LINSTOR/Satellite - Storage configuration exception [Report number 5BEEF5B6-6B93F-000000]
Nov 19 12:52:45 vpx3-1 Satellite[976]: 12:52:45.939 [MainWorkerPool-2] INFO LINSTOR/Satellite - Snapshot 'snap1' ended.
Nov 19 12:53:50 vpx3-1 Satellite[976]: 12:53:50.993 [StltWorkerPool_0002] ERROR LINSTOR/Satellite - Storage configuration exception [Report number 5BEEF5B6-6B93F-000001]

Reminder, everything else works (vm migration, resizing or moving disks, backup / restore vm) and the system is up to date.
In addition, snapshots on local storage work very well.

Do you have any idea about the problem?

thank you,

Greb