pfSense

and it's fairly out-of-date, comparing to the current http://files.pfsense.org/bogon-bn-nonagg.txt

nothing wrong with dns, it's just this code, which causes the script to sleep, if run with no arguments:

1. Sleep for that time.
   if [ ! $1 ]; then # Grab a random value
   value=`od -A n -d -N2 /dev/random | awk '{ print $1 }'`

   echo "rc.update_bogons.sh is sleeping for $value" | logger
   sleep $value
   fi

I can see the point, but does /etc/bogons get updated automatically??

yes it's updated automatically, yours is failing for some reason (lacking DNS is most commonly the reason). It isn't a bug, so please post further discussion to the forum or mailing list.

ignore, all ok, /etc/crontab:
1 3 1 * * root /usr/bin/nice -n20 /etc/rc.update_bogons.sh