[gentoo-user-br] Erro no "updating portage cache"

[Victor Salgado]

Ultimamente toda vez que eu dou um "emerge --sync" na hora do "updating
portage cache" aparece o seguinte erro:

>>> Updating Portage cache:      Traceback (most recent call last):
  File "/usr/bin/emerge", line 4049, in ?
    emerge_main()
  File "/usr/bin/emerge", line 4006, in emerge_main
    action_sync(settings, trees, mtimedb, myopts, myaction)
  File "/usr/bin/emerge", line 2924, in action_sync
    action_metadata(settings, portdb, myopts)
  File "/usr/bin/emerge", line 3019, in action_metadata
    eclass_cache=ec, verbose_instance=noise_maker)
  File "/usr/lib/portage/pym/cache/util.py", line 19, in mirror_cache
    dead_nodes = dict.fromkeys(trg_cache.keys())
  File "/usr/lib/portage/pym/cache/template.py", line 94, in keys
    return tuple(self.iterkeys())
  File "/usr/lib/portage/pym/cache/flat_hash.py", line 123, in iterkeys
    st = os.lstat(p)
OSError: [Errno 5] Input/output error:
'/var/cache/edb/dep/usr/portage/www-servers'

Então, alguém poderia me dar uma luz de que tipo de erro é esse e como posso
resolver?

--Victor