having a /usr/bootes or doing rc /sys/lib/newuser for it isn't necessary
to run a cpu server system correctly.

the /sys/log/cron either wasn't created by the installation or
has a mode that the cpu server running as bootes can't write.
mine is

% ls -l /sys/log/cron
a-rw-rw-rw- M 4 sys sys 14791759 Apr 10 12:34 /sys/log/cron