what is your lightdm version? mine 1.2.1
if i do `ps -ef | grep lightdm` while writing this post i get:

root      1108     1  0 May23 ?        00:00:00 lightdm
root     15862  1108  4 May23 tty7     00:04:14 /usr/bin/X :0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
root     15916  1108  0 May23 ?        00:00:00 lightdm --session-child 12 25

there's already `--sesion-child` running as root. i couldn't find
documentation anything else that running `lightdm --session-child`
myself:

Usage: lightdm --session-child INPUTFD OUTPUTFD

it exits with value 1 "if (argc != 4)"
looking at source code of lightdm 1.2.1 those two integers stands for 
"from_deamon_output" "to_deamon_output"

running `lightdm --test-mode` on pts gives me the same Xephyr requirement, but 
running it on tty says:
"Failed to get D-Bus connection"

if i build ps tree `ps -ejH`:

  PID  PGID   SID TTY          TIME CMD
 1108  1108  1108 ?        00:00:00   lightdm
 1163  1163  1163 tty7     00:06:39     Xorg
 1931  1108  1108 ?        00:00:00     lightdm
 1962  1962  1962 ?        00:00:00       sh
 1991  1991  1991 ?        00:00:00         ssh-agent
 2008  1962  1962 ?        00:00:00         xscreensaver
 2010  1962  1962 ?        00:00:00         xfce4-session

which bring me back to questioning xauth. Xorg to be more specific. Don't know 
why my gut says it's not lightdm..
Also - why last four processes goes under lightdm tree? from logic by process 
name ok, but from parent pgid logic..?

(i'm writing this post offline. second day)
so i thought let's try good old `kill -9` and what i discovered - killing 
lightdm doesn't do anything besides hanging the pc, but killing Xorg (in pts 
hangs, in tty restarts gui interface in pts) and both ways killing Xorg creates 
the file!

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https://bugs.launchpad.net/bugs/984785

Title:
  .goutputstream files polluting $HOME

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