Memory leak if exception is raised in cursor's each() callback

#!/usr/bin/env python2

# -*- coding: utf-8 -*-

from tornado.ioloop import IOLoop, PeriodicCallback

import motor

loop = IOLoop.instance()

def each(result, error):

	raise Exception()

def test_callback():

	con = motor.MotorClient("mongodb://admin:password@127.0.0.1:27017/admin")

	cursor = con.test.test.find({})

	cursor.each(callback=each)

clbk = PeriodicCallback(test_callback, 1000)

clbk.start()

loop.start()