On 02/21/12 15:32, zfs-dev wrote:
You might want to try a reboot of the system. There is some low level
caching of the encryption key in the kernel. I noticed that you can
remove the key and continue to mount and umount it without a key so long
as you do not reboot. Maybe this will clear it up. I never recommend
"just reboot" however, in this case it may actually work.

That behaviour is by design and is documented on zfs(1M) in the 'zfs umount' section as follows:

         For an encrypted dataset, the key is not  unloaded  when
         the file system is unmounted. To unload the key, see zfs

Darren J Moffat
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