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You know what: I think we should remove the os.listdir error
handling:

* The docs only specify "errors resulting from *failed
removals*" as being handled. If they didn't we should worry
about OSErrors from the os.path.* calls in os.walk() too.
* The os.listdir error handling hasn't been in a final
release, so no backwards compatibility problems yet.
* We can't get the path right for os.listdir.
* The problem also existed before the rewrite using
os.walk(), so reverting to that is not a solution.

Patch (the last?) is attached.