cryptsetup failed to access temporary keystore device

Pierre Abbat phma at
Fri Jun 3 14:21:47 PDT 2011

# cryptsetup luksFormat /dev/da8s0e
WARNING!!! Possibly insecure memory, missing mlockall()

This will overwrite data on /dev/da8s0e irrevocably.

Are you sure? (Type uppercase yes): YES
Enter LUKS passphrase:
Verify passphrase:
Failed to access temporary keystore device.

When I dump it, there are no keyslots in use. What's wrong? This is the 
external drive on the USB cable; I have created a Hammer filesystem on 
another partition.

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