I was trying to destroy a filesystem and I was baffled by the following error:

zfs destroy -r rpool/test/opt
cannot destroy 'rpool/test/opt/csw@20111101_1405': dataset already exists

zfs destroy -r rpool/test/opt/csw@20111101_1405
cannot destroy 'rpool/test/opt/csw@20111101_1405': snapshot is cloned

It turns out there was a zfs receive writing to the filesystem.

A more sensible error would have been "dataset is busy".


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