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["bodhi.zazen" <bodhi.zazen@xxxxxxxxxx>]

I am getting the same error message with ecryptfs-utils - 73-0ubuntu1 :(

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Regression in mount helper filename encryption support
https://bugs.launchpad.net/bugs/331948
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Status in eCryptfs - Enterprise Cryptographic Filesystem: Fix Released
Status in “ecryptfs-utils” source package in Ubuntu: Fix Released

Bug description:
Release -70 or -71 caused a regression in filename encryption support in the mount helper.

To reproduce:
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#> mount -t ecryptfs /mnt/.ecryptfs-ext3/ /mnt/ecryptfs-ext3/
Select key type to use for newly created files: 
 1) openssl
 2) passphrase
Selection: 2
Passphrase: 
Select cipher: 
 1) aes: blocksize = 16; min keysize = 16; max keysize = 32 (not loaded)
 2) blowfish: blocksize = 16; min keysize = 16; max keysize = 32 (not loaded)
 3) des3_ede: blocksize = 8; min keysize = 24; max keysize = 24 (not loaded)
 4) twofish: blocksize = 16; min keysize = 16; max keysize = 32 (not loaded)
 5) cast6: blocksize = 16; min keysize = 16; max keysize = 32 (not loaded)
 6) cast5: blocksize = 8; min keysize = 5; max keysize = 16 (not loaded)
Selection [aes]: 
Select key bytes: 
 1) 16
 2) 32
 3) 24
Selection [16]: 
Enable plaintext passthrough (y/n) [n]: 
Enable filename encryption (y/n) [n]: y
Error attempting to evaluate mount options: [-16] Device or resource busy
Check your system logs for details on why this happened.
Try updating your ecryptfs-utils package, and/or
submit a bug report on https://launchpad.net/ecryptfs
---

Normally, it would ask for the fnek sig, but now it errors out with -16.  I'm not seeing anything related in the logs.