Atd is using 50% of cpu

Hi,

I use a turris omnia 2 GB, version 3.11.1 as a standard router. Today I observed, that a process called atd is using 50% the CPU (from top). If I run the command

at -l

it list following jobs, that are running

4 Thu Dec 13 03:30:00 2018 a root
4 Thu Dec 13 03:30:00 2018 = root
5 Sat Dec 22 03:30:00 2018 a root
5 Sat Dec 22 03:30:00 2018 = root

If call

at -c 3

it shows following script:

#!/bin/sh

atrun uid=0 gid=0

mail root 0

umask 22
USER=root; export USER
SHLVL=2; export SHLVL
HOME=/root; export HOME
MAILTO=; export MAILTO
LOGNAME=root; export LOGNAME
PATH=/usr/bin:/bin:/sbin:/usr/sbin; export PATH
PWD=/root; export PWD
cd /root || {
echo ‘Execution directory inaccessible’ >&2
exit 1
}
reboot

#!/bin/sh

atrun uid=0 gid=0

mail root 0

umask 22
USER=root; export USER
SHLVL=2; export SHLVL
HOME=/root; export HOME
MAILTO=; export MAILTO
LOGNAME=root; export LOGNAME
PATH=/usr/bin:/bin:/sbin:/usr/sbin; export PATH
PWD=/root; export PWD
cd /root || {
echo ‘Execution directory inaccessible’ >&2
exit 1
}
reboot

I have no idea, what this job does, and why it is running. Does anybody has any clues regarding this?

best regards
nhok

Just guessing, are those maybe zombified scheduled reboots? (issued from Foris/Luci or by pkgupdate/update.sh)? In /var/spool/cron/atspool or/var/spool/cron/atjobs should have some files while atd is running. Also syslog should have some more info. Personally i would kill those processes. With following check of /root, /tmp, /var folders if exists and are accesible (+ there is free space).