> What platform(s) are you seeing it on?  In your case, it sounded
> like it may have been hanging indefinitely on you, as opposed to
> being a ~20 second delay that would eventually return?

Yup, this happens on multiple fedora core servers, and they were hung
up for several hours. We didn't notice this until we started trying
to gracefully shutting down these threads, and realized a good
chunk of them were stuck.

This little tool quickly revealed which line was the culprit :)