Comment 11 for bug 840641

Wow, this is an interesting bug alright

It definitely looks like a greenlet bug to me. See this thread:

http://groups.google.com/group/gevent/browse_thread/thread/fee2097e2f3bae5e

Moving to greenlet. I'll see if I can isolate what the upstream fix was, or whether we can just update to a newer version with the fix