I have a system that I set up with Maverick and the "automatically apply security updates" setting. It is now sending e-mail on a daily basis:
Subject: Anacron job 'cron.daily' on gwen /etc/cron.daily/apt: Segmentation fault
If I manually "apt-get update; apt-get dist-upgrade", it runs just fine. Also, if I login and run /etc/cron.daily/apt it also does not give the segfault.
I did some searches on google and most of the results seem to be from 2008 and related to "pam_mount", which is not on this system.