gdm failed to give slave programs access to display

[root@p7-1456c ~]# systemctl status gdm.service
gdm.service - GNOME Display Manager
   Loaded: loaded (/usr/lib/systemd/system/gdm.service; enabled)
   Active: active (running) since Mon 2013-08-12 08:16:08 EDT; 3h 48min ago
 Main PID: 1072 (gdm-binary)
   CGroup: name=systemd:/system/gdm.service
           ├─1072 /usr/sbin/gdm-binary
           ├─3133 /usr/libexec/gdm-simple-slave --display-id /org/gnome/DisplayManager/Displays/_3
           ├─3136 /usr/bin/Xorg :3 -background none -verbose -auth /var/run/gdm/auth-for-gdm-wBfAPN/database -seat seat0 -nolisten tcp vt1
           └─3247 gdm-session-worker [pam/gdm-password]

Aug 12 09:10:12 p7-1456c.localdomain gdm-simple-slave[2811]: WARNING: Failed to give slave programs access to the display. Trying to proceed.
Aug 12 09:10:25 p7-1456c.localdomain gdm-simple-slave[2811]: WARNING: Failed to remove slave program access to the display. Trying to proceed.
Aug 12 09:10:25 p7-1456c.localdomain gdm-simple-slave[2811]: WARNING: Child process -2829 was already dead.
Aug 12 09:10:36 p7-1456c.localdomain gdm[1072]: gdm-binary[1072]: WARNING: GdmDisplay: display lasted 0.000512 seconds
Aug 12 09:10:36 p7-1456c.localdomain gdm-binary[1072]: WARNING: GdmDisplay: display lasted 0.000512 seconds
Aug 12 09:10:37 p7-1456c.localdomain gdm-simple-slave[3133]: WARNING: Failed to give slave programs access to the display. Trying to proceed.
Aug 12 09:14:59 p7-1456c.localdomain gdm[1072]: gdm-binary[1072]: WARNING: GdmManager: could not fetch uid of session '8': No such file or directory
Aug 12 09:14:59 p7-1456c.localdomain gdm-binary[1072]: WARNING: GdmManager: could not fetch uid of session '8': No such file or directory
Aug 12 09:15:01 p7-1456c.localdomain gdm-simple-slave[3133]: WARNING: Failed to remove slave program access to the display. Trying to proceed.
Aug 12 11:30:54 p7-1456c.localdomain gdm-simple-slave[3133]: WARNING: GdmSlave: could not fetch type of session '5': No such file or directory