Backup error from a container "failed: exit code 23"

[cglmicro]

Hi guys.

Since I move a container 1307 (PMG12 - it's a proxmox mail gateway container) to it's new PVE, I receive this error every night when it tries to backup itself on my two proxmox backup server:

VMID    NAME    STATUS    TIME    SIZE    FILENAME
1009    xxxxxxxx.legardeur.net    OK    00:00:01    0KB    vm/1009/2022-08-13T03:00:01Z

1307    pmg12.legardeur.net    FAILED    00:00:18    command 'rsync --stats -h -X -A --numeric-ids -aH --delete --no-whole-file --sparse --one-file-system --relative '--exclude=/tmp/?*' '--exclude=/var/tmp/?*' '--exclude=/var/run/?*.pid' /proc/2313600/root//./ /var/lib/vz/dump/tmp/vzdumptmp2262857_1307/' failed: exit code 23

1801    yyyyyyyy.legardeur.net    OK    00:00:31    32.00GB    vm/1801/2022-08-13T03:00:20Z
TOTAL    00:00:50    32.00GB

I can do a manual backup to each PBS no problem, it's only when it's running from the backup job.

Any ideas where I should start looking?

Thanks.

 

[cglmicro]

I'm still strugling with this one.
I tried to create a new schedule to a repo where I never did a backup too, and I received the same error:

()
INFO: starting new backup job: vzdump 1307 --mailto info@xcxcxcxcx.com --notes-template '{{guestname}}' --storage pbs100b-repo2 --mode snapshot --quiet 1 --mailnotification always
INFO: Starting Backup of VM 1307 (lxc)
INFO: Backup started at 2022-08-20 09:17:00
INFO: status = running
INFO: CT Name: pmg12.xcxcxcxcx.net
INFO: including mount point rootfs ('/') in backup
INFO: mode failure - some volumes do not support snapshots
INFO: trying 'suspend' mode instead
INFO: backup mode: suspend
INFO: ionice priority: 7
INFO: CT Name: pmg12.xcxcxcxcx.net
INFO: including mount point rootfs ('/') in backup
INFO: starting first sync /proc/2313600/root/ to /var/lib/vz/dump/tmp/vzdumptmp2043807_1307/
ERROR: Backup of VM 1307 failed - command 'rsync --stats -h -X -A --numeric-ids -aH --delete --no-whole-file --sparse --one-file-system --relative '--exclude=/tmp/?*' '--exclude=/var/tmp/?*' '--exclude=/var/run/?*.pid' /proc/2313600/root//./ /var/lib/vz/dump/tmp/vzdumptmp2043807_1307/' failed: exit code 23
INFO: Failed at 2022-08-20 09:17:26
INFO: Backup job finished with errors
TASK ERROR: job errors

I also have another container, also a PMG migrated to another PVE, that does the same bug.
Many other VM from these same PVE backup just fine.
If I do a manual backup, also in SNAPSHOT MODE or in SUSPEND MODE, also an error, but OK with STOP MODE.

Thanks.