Comment 6 for bug 1423250

It looks like the "bug" is down in eventlet.

1) The server's accepting connections here: https://github.com/eventlet/eventlet/blob/master/eventlet/wsgi.py#L796

2) Keystone wants to break out of the accept loop gracefully, so the wsgi thread drops into the finally: block where it calls pool.waitall(), which then fails an assertion because "Calling waitall() from within one of the GreenPool's greenthreads will never terminate.": https://github.com/eventlet/eventlet/blob/master/eventlet/greenpool.py#L116

Also, here's a better link to the commit: https://github.com/eventlet/eventlet/commit/1c30e9b39f4330babcb3665df4c1a3ba694bc6c1