Anything of interest in the systemd journal around the time this error showed up (PVE and PBS host)? Might not be an issue on the PBS side but logged to the task log. Probably best to perform a full test restore of that particular snapshot, just...
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
Sep 16 12:40:33 pve2-bnkw pvedaemon[3818711]: <root@pam> starting task...
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 ...
yes, i can confirm these are both upstream issues
for the groff one there is an upstream bugreport at https://bugs-devel.debian.org/cgi-bin/bugreport.cgi?bug=1101827
for the apparmor one, i don't find appropriate
>and think the groff error message is a result of this
wrong:
https://askubuntu.com/questions/1521258/what-means-cant-resolve-man7-groff-man-7
so, we have 2 different issues here