在执行portsdb时出错，是什么原因？

执行portsdb -uU的结果为：
Updating the ports index ... Generating INDEX.tmp - please wait..Warning: Duplicate INDEX entry: freeciv-gtk-1.14.1
Warning: Duplicate INDEX entry: mod_jk2-apache2-2.0.2
Warning: Duplicate INDEX entry: mod_rpaf-ap2-0.5
Done.
done
[Updating the portsdb <format:bdb1_btree> in /usr/ports ... - 11732 port entries found .........1000.........2000.........3000.........4000.........5000.........6000.........7000.........8000..../usr/local/lib/ruby/site_ruby/1.8/portsdb.rb:587: [BUG] Bus Error
ruby 1.8.2 (2004-07-29) [i386-freebsd4]

Abort (core dumped)

ruby BUG.

http://www.freebsdforums.org/forums/...threadid=24877

谢谢~~