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Python crashed in the garbage collector when importing the urllib.py module.  That's 1) safe 2) done early after exec(urlgrabber-ext-down).

Any means to reproduce this?   Is your hardware otherwise stable?

urlgrabber-ext-down:
import time, os, errno, sys
from urlgrabber.grabber import ...

urlgrabber/__init__.py:
... just set up few constants

urlgrabber/grabber.py:
import os
import sys
import urlparse
import time
import string
import urllib <= crash

It might be something with my machine as a while before my browser was crashing so I restarted my computer. Then I was trying to install some package via yum when this occurred.

Ok I will close this for now, as it's probably not reproducible.  The usual suspects in such crashes are extension modules, but since the downloader runs in a different process than Yum we can't blame RPM bindings.  And even pycurl has not been imported yet, so we're left with a bug in Python core or faulty hardware.