Comment # 1 on bug 1150533 from Matthias Gerstner

I've reviewed the cron job. It calls `systemctl restart atop` which in turn
runs /usr/share/atop/atop.daily. This bash script restarts a potentially
running atop-daemon. It should be safe.

The PIDFILE handling logic might allow to trick it to send a SIGUSR2 to a
process owned by an attacker in some situations. But I don't think that's very
security relevant.