i believe that this and other misleading errors have been fixed in
cryptsetup 1.0.7~rc1. from the changelog:
* Summary of changes in subversion for 1.0.7-rc1:
* [...]
* Check device size when loading LUKS header. Remove misleading error
message later.
* Add error hint if dm-crypt mapping failed.
* Use better error messages if device doesn't exist or is already used
by other mapping.
* [...]
* Return more descriptive error in case of IO or header format error.
* [...]
* Check device mapper communication and warn user if device-mapper
support missing in kernel.
* [...]
* Error handling improvement.
* [...]
--
Misleading cryptsetup error message
https://bugs.launchpad.net/bugs/267192
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