After some more tests,
It looks like for each new open window in X
x-session-manager makes new connection to 
/tmp/.ICE-unix/{PID of x-session-manager}

It could be followed by runing this command
lsof -p `ps -e | grep x-session | cut -d" " -f1` | grep ICE-unix | wc -l
It will show how many times it open this file..
And it almost never closes it...

So set open file limit to 65000, helps only for few days, depends on you usage 
of the machine.
If 1024 was enough for me for 2-3 days, 65k will work for few month ;-) Good!

Looks like a bug in gnome for me.

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x-session manager eats 100% CPU, nautilus won't start, applications won't start
https://bugs.launchpad.net/bugs/107950
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