Description of problem:

glibc reports an error inside a free() call by python within the
ixf86configmodule.so during a call to xf86config.XF86ConfFiles()

Version-Release number of selected component (if applicable):

pyxf86config-0.3.31-4.fc7

How reproducible:

Try running the attached simple test script against the attached simple
xorg.conf (or your own)

Steps to Reproduce:
1. backup your xorg.conf
2. install attached xorg.conf to /etc/X11/xorg.conf
3. execute attached ./pytest script
  
Actual results:

glibc reports the attached debug report

Expected results:

pytest script should terminate having done nothing.

Additional info:

I detected this when the nvidia-config-display script in the livna distribution
for the nvidia drivers began crashing on start up, wiping out my xorg.conf.