I tried "cat /dev/zero > zerofile" since heavy writing / disk exhaustion
seemed to be related to the problem. And sure enough, after the empty
space went to zero, same errors appeared again to dmesg. After deleting
the zerofile I logged out and tried to login, but it failed. Then I
tried to shutdown cleanly, but it failed. After a hard reboot the disk
space had been freed, and the .Private contained again zero length
files. The perm trick reveals that zeroed files include gnome applet
files and other stuff that logically could have been written into
without user action. All of them are now completely unreadable due to
input/output errors.

I'd say that ecryptfs is still extremely dangerous to use due to data
corruption problems in a common scenario, writing too much. It simply
cannot be offered to users without any kind of warning that this
happens.

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https://bugs.launchpad.net/bugs/509180

Title:
  ecryptfs sometimes seems to add trailing garbage to encrypted files

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