Description of problem:
package-cleanup --dupes crashes 

Version-Release number of selected component (if applicable):
yum-3.2.23-6.fc12.noarch
yum-utils-1.1.22-1.fc12.noarch

How reproducible:
always

Steps to Reproduce:
1. Run: package-cleanup --dupes
  
Actual results:
Setting up yum
Traceback (most recent call last):
  File "/usr/bin/package-cleanup", line 498, in <module>
    main()
  File "/usr/bin/package-cleanup", line 459, in main
    my = initYum(opts)
  File "/usr/bin/package-cleanup", line 60, in initYum
    my.doTsSetup()
  File "/usr/lib/python2.6/site-packages/yum/depsolve.py", line 85, in doTsSetup
    return self._getTs()
  File "/usr/lib/python2.6/site-packages/yum/depsolve.py", line 100, in _getTs
    self._getTsInfo(remove_only)
  File "/usr/lib/python2.6/site-packages/yum/depsolve.py", line 111, in _getTsInfo
    pkgSack = self.pkgSack
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 666, in <lambda>
    pkgSack = property(fget=lambda self: self._getSacks(),
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 507, in _getSacks
    self.excludePackages()
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 1148, in excludePackages
    self.pkgSack.addPackageExcluder(repoid, 'exclude.match', match)
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 666, in <lambda>
    pkgSack = property(fget=lambda self: self._getSacks(),
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 507, in _getSacks
    self.excludePackages()
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 1148, in excludePackages

...this trio is repeated many times, until it ends with...:

  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 1148, in excludePackages
    self.pkgSack.addPackageExcluder(repoid, 'exclude.match', match)
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 666, in <lambda>
    pkgSack = property(fget=lambda self: self._getSacks(),
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 486, in _getSacks
    if self._pkgSack and thisrepo is None:
  File "/usr/lib/python2.6/site-packages/yum/packageSack.py", line 336, in __len__
    for sack in sorted(self.sacks.values()):
RuntimeError: maximum recursion depth exceeded while calling a Python object


Expected results:
No traceback.

Additional info:
This bug is similar to bug 485578, but it happens without having the versionlock plugin installed and even with no plugins at all.