I have tried 3 different laptops with 3 different distro's.
Ubuntu 16.04.1, Ubuntu 16.04.3 and Linux Mint 17.
Also I've tried about 8 different kernels.

For that reason, a bug report with apport-collect, containing all my
hardware serials and stored wifi connections, seems irrelevant. I'm
marking this bug confirmed, as instructed by the Kernel Bot.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

** Description changed:

- I have two systems that have a Dropbox folder synced. One of the
- subfolders contains sensitive data encrypted using ecryptfs. Both were
- running linux kernel 4.4.0-53-generic.
+ UPDATE:
+ 
+ I think the problem only exists for unencrypted filenames that would
+ previously pass (by default or) by passing the ecryptfs_passthrough
+ option.
+ 
+ Unencrypted filenames work as expected on kernels <=4.4, but are
+ inaccessable and listed as ???????? in kernels >=4.8.
+ 
+ Original report below:
+ 
+ --------
+ 
+ 
+ I have two systems that have a Dropbox folder synced. One of the subfolders 
contains sensitive data encrypted using ecryptfs. Both were running linux 
kernel 4.4.0-53-generic.
  
  I have since upgraded one system to use linux kernel 4.8.0-41-generic.
  Now, the decrypted directory can no longer see groups and owners or read
  files. All permissions are replaced by questionmarks.
  
  4.8.0-41-generic
  
  $ ll
  ls: cannot access 'Contracts': No such file or directory
  ls: cannot access 'Documents': No such file or directory
  ls: cannot access 'Work': No such file or directory
  total 12K
  drwxr-x--- 5 redsandro redsandro 4.0K Mar 31 15:54 ./
  drwxr-xr-x 7 redsandro redsandro 4.0K Apr 13 13:24 ../
  d????????? ? ?      ?         ?            ? Contracts/
  d????????? ? ?      ?         ?            ? Documents/
  d????????? ? ?      ?         ?            ? Work/
  
  The other machine still works fine.
  
  4.4.0-53-generic:
  
  $ ll
  total 56K
  drwxr-x---  5 redsandro redsandro  12K Apr  4 16:11 ./
  drwxr-xr-x  8 redsandro redsandro 4.0K Oct 18 13:25 ../
  drwxr-xr-x  3 redsandro redsandro 4.0K Nov  2 18:50 Contracts/
  drwxr-xr-x 11 redsandro redsandro 4.0K Mar  9 17:03 Documents/
  drwxr-xr-x  3 redsandro redsandro 4.0K Mar  4  2013 Work/
  
  For both machines:
- $ apt version ecryptfs-utils 
+ $ apt version ecryptfs-utils
  111-0ubuntu1.1

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https://bugs.launchpad.net/bugs/1682410

Title:
  ecryptfs-utils not working properly with linux kernel 4.8.0-41-generic

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