100% CPU usage in xmpp4r

xmpp4r_harness.rb

# Steps to repro:
#
# Set up two XMPP accounts:
# "account1@yourserver.org" and "account2@yourserver.org"
# Both with password "password"
#
# Start the sinatra webserver server using:
#
# ruby -rubygems xmpp4r_harness.rb
#
# We can now freak out the server with:
# ab -c 25 -n 1000 http://localhost:4567/hi

# AUTH AND ACCOUNT INFO

JABBER_SERVER = "yourserver.org"
ACCOUNT1 = "account1"
ACCOUNT2 = "account2"

# REPRO HARNESS

require 'rubygems'
require 'xmpp4r'
require 'xmpp4r-simple'
require 'sinatra'

get '/hi' do
  jabber = Jabber::Simple.new("#{ACCOUNT1}@#{JABBER_SERVER}", "password")
  jabber.deliver("#{ACCOUNT2}@#{JABBER_SERVER}", "hi there!")
end