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Date: Tue, 03 Mar 2009 12:12:23 +0900
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From: Randy Bush <randy@psg.com>
To: freebsd-fs@freebsd.org
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Subject: .zfs/snapshot: Bad file descriptor
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moo.edu:/usr# rm -rf .zfs
rm: .zfs/snapshot: Bad file descriptor
rm: .zfs: File exists

moo.edu:/usr# ls -l .zfs 
ls: snapshot: Bad file descriptor
total 0

and old trusty emacs dired did not help
  (file-error Removing old name operation not supported /usr/.zfs/snapshot)

what do i whack?

randy