Comment 35 for bug 984785

Summary of previous comments:
- blank files (#25, #31) or partial copies of .Xauthority (#11, #15, #26 / #28, mine too)
- in Ubuntu and Xubuntu (files shown by Nautilus, Thunar and ls; no file manager problem)
- created on direct shutdown (but not logout -> shutdown)

Workaround: put 'sh -c "rm ~/.goutputstream-*"' (without the single quotes) into autorun

My Software:
- Ubuntu 12.04 amd64 (up-to-date)
- file-roller installed but usually not running (also not running on shutdown: see below)
- No gtk-recordmydesktop, Dropbox or UbuntuOne.

I tried to find out which software is creating these files. I used (e.g.) inotifywait (package inotify-tools) and lsof, but it didn't work out. Probably the .goutputstream-* files are open only very short (too short for my script to catch it although run with niceness -19).

Then I simply logged all processes running with my UID (1000) in an endless loop (i.e. until the script was terminated because of shutdown). I'll attach the script and its shortened output (removed duplicate blocks with no changes in process list and many blocks at the beginning).

The output also contains a line stating "FILE CREATED!!!" when the ~/.goutputstream-* file is created. Just before / after this gnome-session quits and lightdm is started by UID 1000 (not root as usual). I don't know, why it is started, but it is also the next process which quits.

lightdm also uses the ~/.Xauthority file. See
strings `which lightdm` | grep -iE 'output|xauth'
and the source code of lightdm:
grep -ri xauthority /path/to/source/of/lightdm-1.2.1/src/

lightdm is used by Ubuntu and Xubuntu, but not Kubuntu. This fits to the previous comments.

Maybe also related: GIO (part of glib)
http://developer.gnome.org/gio/2.30/GOutputStream.html

Get own processes using this:
ps -o comm= -U 1000 -u 1000 | while read cmd; do file=$(which "$cmd") || file=$(locate -b "$cmd*"); strings -af $file | grep -E ': g.*output.*stream'; done > search.out

I assume it's a problem with lightdm, but I can't fix it. I hope my information helps.