php or moodle segfault errors

[Peter k]

I'm getting segfault errors like these in my /var/log/syslog every 5 minutes.
I'm running Hardy Edubuntu on a dell poweredge with 3gb and p4 2.8ghz.
It's accompanied (not necessarily related) by my clients occasionally
freezing (which hasn't happened since I started writing this.)

 Nov  7 10:39:01 edubuntu405 /USR/SBIN/CRON[27344]: (root) CMD (  [ -x
/usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find
/var/lib/php5/ -type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 |
xargs -r -0 rm)
Nov  7 10:40:01 edubuntu405 /USR/SBIN/CRON[27446]: (www-data) CMD ([
-f /usr/share/moodle/admin/cron.php ] && /usr/bin/php -f
/usr/share/moodle/admin/cron.php > /dev/null)
Nov  7 10:40:01 edubuntu405 kernel: [ 4819.186643] php[27447]:
segfault at b729a000 eip b729a000 esp bfb9fdfc error 4

thx for any help,
-peter
Bard High School Early College
NY, NY