portupgrade failed with ruby

fangzhang

I dont know how it came, but when I tried portupgrade or pkgdb, errors were reported with ruby and core dumped. The messages are like the following.
root@dust# pkgdb -F
--->  Checking the package registry database
[Updating the pkgdb  in /var/db/pkg ... - 240 packages found (-3 +3) (...)/usr/local/lib/ruby/site_ruby/1.8/pkgdb.rb:466: [BUG] Segmentation fault
ruby 1.8.2 (2004-12-25) [i386-freebsd6]
Abort trap (core dumped)
I searched the net and got a solution a fix this problem, yet I'm not sure whats there behind these.
export PORTSDBDRIVER=bdb_btree
portsdb -fu
pkgdb -fu


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