Rails - Jan 2006 - corrupted double-linked list (Ruby 1.8.4, FC 4)

After upgrading to Ruby 1.8.4 I started getting this error message:

glibc detected *** /usr/bin/ruby: corrupted double-linked list: 0x0a6d8540
***

I am running Ruby 1.8.4, Ruby on Rails 1, Fedora Core 4.

Any ideas why this is happening?

Thanks,
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