Comment 109 for bug 509180

I've just been bitten with this. Soemthing ate 500GB (yes GB!) one night when my machine was on.. I couldn't find out what had done it, the machine eventually restarted and the culprit was gone so it must have been some crazy cache issue. It has made a right mess of KDE on me, Akonadi looks to be broken because of it. I continually get messages like:

[32223.735781] Valid eCryptfs headers not found in file header region or xattr region
[32223.735788] Either the lower file is not in a valid eCryptfs format, or the key could not be retrieved. Plaintext passthrough mode is not enabled; returning -EIO

Kernel is: 2.6.38-11-generic #48-Ubuntu SMP Fri Jul 29 19:02:55 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

Running find ../.ecryptfs/felim/.Private -xdev -size 0c -exec ls '{}' \; | wc -l

Gives me 351 files... I've tried following this thread but it's hard to know what can be done. IS a restore from backup the only real option?