I am running Debian kFreeBSD wheezy. Accidentally I mounted my zfs pool directly into /mnt. When I try to unmount I get an error:

zfs unmount myzfspool
cannot unmount '/mnt': Device or resource busy

How could I fix that?


The filesystem mounted on /mnt has open file descriptors from running processes. You normally could try an umount with the force option, but looking up those processes with "lsof /mnt" and end them is safer.

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