Description of problem:
I believe this happens during boot. Current Rawhide (07-29) won't reach gdm with SELinux in enforcing mode; I'm reporting all the AVCs I can find. Works fine with enforcing=0 .
SELinux is preventing /usr/bin/dbus-daemon from 'bind' accesses on the netlink_selinux_socket .

*****  Plugin catchall (100. confidence) suggests  ***************************

If you believe that dbus-daemon should be allowed bind access on the  netlink_selinux_socket by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep dbus-daemon /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
Target Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
Target Objects                 [ netlink_selinux_socket ]
Source                        dbus-daemon
Source Path                   /usr/bin/dbus-daemon
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           dbus-1.6.12-1.fc20.x86_64
Target RPM Packages           
Policy RPM                    selinux-policy-3.12.1-67.fc20.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Permissive
Host Name                     (removed)
Platform                      Linux (removed) 3.11.0-0.rc3.git0.1.fc20.x86_64 #1
                              SMP Mon Jul 29 19:50:04 UTC 2013 x86_64 x86_64
Alert Count                   2
First Seen                    2013-07-29 16:58:13 PDT
Last Seen                     2013-07-29 16:58:13 PDT
Local ID                      1f0ba889-85d6-49fa-b0c7-b57ab518fa85

Raw Audit Messages
type=AVC msg=audit(1375142293.348:380): avc:  denied  { bind } for  pid=1046 comm="dbus-daemon" scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tclass=netlink_selinux_socket


type=SYSCALL msg=audit(1375142293.348:380): arch=x86_64 syscall=bind success=yes exit=0 a0=3 a1=7fff680bfeb0 a2=c a3=7fff680bfc70 items=0 ppid=1042 pid=1046 auid=4294967295 uid=42 gid=42 euid=42 suid=42 fsuid=42 egid=42 sgid=42 fsgid=42 ses=4294967295 tty=(none) comm=dbus-daemon exe=/usr/bin/dbus-daemon subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null)

Hash: dbus-daemon,xdm_t,xdm_t,netlink_selinux_socket,bind

Additional info:
reporter:       libreport-2.1.6
hashmarkername: setroubleshoot
kernel:         3.11.0-0.rc3.git0.1.fc20.x86_64
type:           libreport