corrupted double-linked list error on backup finish

RolandK

RolandK

Famous Member
Proxmox Subscriber
Mar 5, 2019
1,017
222
108
52
i manually started some backup while there was some load on the pbs disks and got "corrupted double-linked list" error once on backup.

the second backup run afterwards ran fine and validating the backup did not show any error

should i worry ?

what does this error mean ?

...
NFO: 27% (452.0 MiB of 1.6 GiB) in 3s, read: 150.7 MiB/s, write: 145.3 MiB/s
INFO: 46% (760.0 MiB of 1.6 GiB) in 6s, read: 102.7 MiB/s, write: 101.3 MiB/s
INFO: 65% (1.0 GiB of 1.6 GiB) in 9s, read: 101.3 MiB/s, write: 101.3 MiB/s
INFO: 85% (1.4 GiB of 1.6 GiB) in 12s, read: 109.3 MiB/s, write: 101.3 MiB/s
INFO: 100% (1.6 GiB of 1.6 GiB) in 15s, read: 77.3 MiB/s, write: 65.3 MiB/s
INFO: Waiting for server to finish backup validation...
INFO: backup was done incrementally, reused 30.49 GiB (95%)
INFO: transferred 1.59 GiB in 24 seconds (67.7 MiB/s)
INFO: adding notes to backup
INFO: Finished Backup of VM 101 (00:00:25)
INFO: Backup finished at 2025-09-16 12:40:58
INFO: Backup job finished successfully
corrupted double-linked list
 
  • Like
Reactions: RolandK
there are no errors/warnings visible in any of the pbs logs

on the pve host where the backup had this error i find in journalctl

Code: 
Sep 16 12:40:33 pve2-bnkw pvedaemon[3818711]: <root@pam> starting task UPIDve2-bnkw:003C2BCF:7C760E9F:68C93EA1:vzdump:101:root@pam:
Sep 16 12:40:33 pve2-bnkw pvedaemon[3943375]: INFO: starting new backup job: vzdump 101 --remove 0 --storage pbs01 --mode snapshot --notes-template '{{guestname}}' --node pve2-bnkw --notification-mode auto
Sep 16 12:40:33 pve2-bnkw pvedaemon[3943375]: INFO: Starting Backup of VM 101 (qemu)
Sep 16 12:40:58 pve2-bnkw pvedaemon[3943375]: INFO: Finished Backup of VM 101 (00:00:25)
Sep 16 12:40:59 pve2-bnkw pvedaemon[3943375]: INFO: Backup job finished successfully
Sep 16 12:40:59 pve2-bnkw pvedaemon[3818711]: <root@pam> end task UPIDve2-bnkw:003C2BCF:7C760E9F:68C93EA1:vzdump:101:root@pam: unexpected status

and in tasks

Code: 
# cat "UPID:pve2-bnkw:003C2BCF:7C760E9F:68C93EA1:vzdump:101:root@pam:"
INFO: starting new backup job: vzdump 101 --remove 0 --storage pbs01 --mode snapshot --notes-template '{{guestname}}' --node pve2-bnkw --notification-mode auto
INFO: Starting Backup of VM 101 (qemu)
INFO: Backup started at 2025-09-16 12:40:33
INFO: status = running
INFO: VM Name: pbx
INFO: include disk 'scsi0' 'vms-files:101/vm-101-disk-0.qcow2' 32G
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: snapshots found (not included into backup)
INFO: creating Proxmox Backup Server archive 'vm/101/2025-09-16T10:40:33Z'
INFO: issuing guest-agent 'fs-freeze' command
INFO: issuing guest-agent 'fs-thaw' command
INFO: started backup task '5ac78459-63ca-4749-96b3-24c765b7d1e9'
INFO: resuming VM again
INFO: scsi0: dirty-bitmap status: OK (1.6 GiB of 32.0 GiB dirty)
INFO: using fast incremental mode (dirty-bitmap), 1.6 GiB dirty of 32.0 GiB total
INFO:  27% (452.0 MiB of 1.6 GiB) in 3s, read: 150.7 MiB/s, write: 145.3 MiB/s
INFO:  46% (760.0 MiB of 1.6 GiB) in 6s, read: 102.7 MiB/s, write: 101.3 MiB/s
INFO:  65% (1.0 GiB of 1.6 GiB) in 9s, read: 101.3 MiB/s, write: 101.3 MiB/s
INFO:  85% (1.4 GiB of 1.6 GiB) in 12s, read: 109.3 MiB/s, write: 101.3 MiB/s
INFO: 100% (1.6 GiB of 1.6 GiB) in 15s, read: 77.3 MiB/s, write: 65.3 MiB/s
INFO: Waiting for server to finish backup validation...
INFO: backup was done incrementally, reused 30.49 GiB (95%)
INFO: transferred 1.59 GiB in 24 seconds (67.7 MiB/s)
INFO: adding notes to backup
INFO: Finished Backup of VM 101 (00:00:25)
INFO: Backup finished at 2025-09-16 12:40:58
INFO: Backup job finished successfully
corrupted double-linked list

spice display is not being used

verify and restore of the "affected" backup went fine
 
Last edited:
You must log in or register to reply here.
Top Bottom