Description:

When a second X server is started and it is exited, it kills the first server along with it.

Steps to reproduce:
1. Go to tty2, and run
xinit /usr/bin/xterm -- :1
2. You will be switched to the VT of that first X server with an xterm window open.
3. In the xterm window, run
xinit /usr/bin/xterm -- :2
4. You are now in that second X server with an xterm window open.
5. In this xterm window, run
exit
6. Both the first X server and second X server will get killed. The correct behavior is that only the second one should be killed.

Additional info:
~ % uname -a
Linux ahmed-x201 3.5.4-1-pae #1 SMP PREEMPT Tue Sep 18 20:42:04 EDT 2012 i686 GNU/Linux

~ % pacman -Qi xorg-server
Name : xorg-server
Version : 1.12.4-1
URL : http://xorg.freedesktop.org
Licenses : custom
Groups : xorg
Provides : x-server
Depends On : libxdmcp libxfont udev libpciaccess libdrm pixman
libgcrypt libxau xorg-server-common xf86-input-evdev
Optional Deps : None
Required By : None
Conflicts With : nvidia-utils<=290.10
Replaces : None
Installed Size : 3884.00 KiB
Packager : Jan de Groot <jgc@archlinux.org>
Architecture : i686
Build Date : Mon 27 Aug 2012 04:09:46 AM EDT
Install Date : Wed 29 Aug 2012 12:03:12 AM EDT
Install Reason : Explicitly installed
Install Script : No
Description : Xorg X server

~ % pacman -Ql xorg-xinit
xorg-xinit /etc/
xorg-xinit /etc/X11/
xorg-xinit /etc/X11/xinit/
xorg-xinit /etc/X11/xinit/xinitrc
xorg-xinit /etc/X11/xinit/xserverrc
xorg-xinit /etc/skel/
xorg-xinit /etc/skel/.xinitrc
xorg-xinit /etc/skel/.xsession
xorg-xinit /usr/
xorg-xinit /usr/bin/
xorg-xinit /usr/bin/startx
xorg-xinit /usr/bin/xinit
xorg-xinit /usr/share/
xorg-xinit /usr/share/licenses/
xorg-xinit /usr/share/licenses/xorg-xinit/
xorg-xinit /usr/share/licenses/xorg-xinit/COPYING
xorg-xinit /usr/share/man/
xorg-xinit /usr/share/man/man1/
xorg-xinit /usr/share/man/man1/startx.1.gz
xorg-xinit /usr/share/man/man1/xinit.1.gz

~ % cat .zprofile
PATH=${PATH}:${HOME}/Local/bin

vt=$(fgconsole 2>/dev/null)
(( vt == 1 )) && exec startx -- vt$vt &> /dev/null
unset vt

~ % cat .xinitrc
#!/bin/sh
#
# ~/.xinitrc
#
# Executed by startx (run your window manager from here)

if [ -d /etc/X11/xinit/xinitrc.d ]; then
for f in /etc/X11/xinit/xinitrc.d/*; do
[ -x "$f" ] && . "$f"
done
unset f
fi

# exec gnome-session
# exec startkde
#exec startxfce4 --with-ck-launch
exec ck-launch-session dbus-launch startxfce4
#exec ck-launch-session dbus-launch startkde
# ...or the Window Manager of your choice