Google send me here because of a mysterious line from my syslog:
Apr 13 22:22:08 capcom kernel: [35953.661716] ecryptfs_lookup: lookup_one_len() 
returned [-2] on lower_dentry = [2]

Which appears in my syslog several times.

I am _very_ curious about the reasons for that, because I just
mysteriously lost ~3GB of data. It was only my .local/share/Trash
directory, so it is not too drastic, but I am kind of worried that it
might happen again with some other directory.

When I lost that directory, I tried to recreate it. But mkdir insited
that it couldn't create the directory because it was already there.
Neither KDE or my shell were able to find the Trash directory, let alone
list its contents.

Before all that, I (luckily?) just made a backup of my home. I use a
little script that creates an lvm snapshot of my home partition first,
then makes the backup and afterwards removes the snapshot. Maybe this
has something to do with it? Maybe ecryptfs somehow does not like that?
The snapshot itself is really large, larger than my home partition
itself, so I don't think that I ran out of space there (which could
maybe explain my mysteriously disappering directory).

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https://bugs.launchpad.net/bugs/344878

Title:
  file name too long when creating new file (ecryptfs_lookup:
  lookup_one_len() returned [-36] on lower_dentry)

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