yum and rpm hang, rebuilddb hangs on jetty-servlets

[tetravalence]

I've been using Fedora for a few months now (since December), and it's been working perfectly until now. Yum commands (update, install, etc.) hang indefinitely and eventually lock up my entire system. I tried running rpm -vv --rebuilddb, and it hangs while working on "jetty-servlets" with this output.

D:  read h#    1795 Header V3 RSA/SHA256 Signature, key ID 1aca3465: OK
D: adding "jetty-servlets" to Name index.
D: adding 3 entries to Basenames index.
D: adding "Applications/Internet" to Group index.
D: adding 15 entries to Requirename index.
D: adding 3 entries to Providename index.
D: adding 3 entries to Dirnames index.
D: adding 1 entries to Installtid index.
D: adding 1 entries to Sigmd5 index.
D: adding "ea33bdce862954f4bfc0ce9e7504e45c47416f6d" to Sha1header index.

I'm completely at a loss, so any help would be greatly appreciated.