It seems that NetBSD-1.5's cron dumps core when the filesystem is full.
At least on my system, I cannot launch cron with a full filesystem. I
can't check that it will work again with less files because my system
now have many other problems, and I don't want to trash important files,
so if someone is able to check this problem, it could be a good idea
send-pr'it. 

-- 
Emmanuel Dreyfus.   
Il ne suffit pas de crier l'iMac, l'iMac! en sautant comme un cabri...
p99dreyf@criens.u-psud.fr