While playing with the rhn satellite channel, I found myself getting this
traceback a few times.  It looks like it pops up when a dependency can't be
solved.  This is running up2date-2.7.27-7.x.2.

Traceback (innermost last):
  File "/usr/sbin/up2date", line 1111, in ?
    main()
  File "/usr/sbin/up2date", line 370, in main
    sys.exit(batchRun(argObj.getLong("list"), pkgNames, fullUpdate))
  File "/usr/sbin/up2date", line 1002, in batchRun
    (depPackages, conflicts) = up2date.dryRun(selPkgList, printCallback,
percentCallback)
  File "/usr/share/rhn/up2date_client/up2date.py", line 2020, in dryRun
    ret = depsolve.solvedep()
  File "/usr/share/rhn/up2date_client/up2date.py", line 1986, in solvedep
    ret = self.process_deps(deps)
  File "/usr/share/rhn/up2date_client/up2date.py", line 1952, in process_deps
    changed = self.__dependencies(dependencies)
  File "/usr/share/rhn/up2date_client/up2date.py", line 1839, in __dependencies
    for s in solved[:]:
TypeError: unsliceable object