INTERESTING: In the new kernels, you can still write new files and read
them. You cannot read files written in 'old' kernels.

But when booting the old kernel, you can read ALL files, including the
one written using the newer kernel!

Booting back in 4.8, 4.10 or 4.12, and again you can only read the new
file, not the old files. Are there some kind of stricter options that
are backwards compatible since 4.8?

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

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

Status in linux package in Ubuntu:
  Expired

Bug description:
  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 
  111-0ubuntu1.1

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