Description of problem:
SELinux is preventing /usr/sbin/groupadd from 'write' accesses on the file /etc/group-.

*****  Plugin restorecon (94.8 confidence) suggests   ************************

If you want to fix the label. 
/etc/group- default label should be passwd_file_t.
Then you can run restorecon.
Do
# /sbin/restorecon -v /etc/group-

*****  Plugin catchall_labels (5.21 confidence) suggests   *******************

If you want to allow groupadd to have write access on the group- file
Then you need to change the label on /etc/group-
Do
# semanage fcontext -a -t FILE_TYPE '/etc/group-'
where FILE_TYPE is one of the following: afs_cache_t, faillog_t, initrc_tmp_t, lastlog_t, passwd_file_t, puppet_tmp_t, security_t, shadow_t, user_cron_spool_t, user_tmp_t. 
Then execute: 
restorecon -v '/etc/group-'


*****  Plugin catchall (1.44 confidence) suggests   **************************

If you believe that groupadd should be allowed write access on the group- file 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 groupadd /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                unconfined_u:unconfined_r:groupadd_t:s0-s0:c0.c102
                              3
Target Context                system_u:object_r:etc_t:s0
Target Objects                /etc/group- [ file ]
Source                        groupadd
Source Path                   /usr/sbin/groupadd
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           shadow-utils-4.1.5.1-13.fc21.x86_64
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-63.fc21.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 3.16.0-0.rc4.git2.1.fc22.x86_64 #1
                              SMP Wed Jul 9 17:15:03 UTC 2014 x86_64 x86_64
Alert Count                   1
First Seen                    2014-07-12 22:21:09 CEST
Last Seen                     2014-07-12 22:21:09 CEST
Local ID                      106f8593-7c2b-4d3d-bb27-170a1d618aa2

Raw Audit Messages
type=AVC msg=audit(1405196469.584:724): avc:  denied  { write } for  pid=31188 comm="groupadd" name="group-" dev="dm-0" ino=1837543 scontext=unconfined_u:unconfined_r:groupadd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:etc_t:s0 tclass=file permissive=0


type=SYSCALL msg=audit(1405196469.584:724): arch=x86_64 syscall=open success=no exit=EACCES a0=7fff92f40e70 a1=241 a2=1b6 a3=3a745f656c69665f items=0 ppid=31187 pid=31188 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts1 ses=1 comm=groupadd exe=/usr/sbin/groupadd subj=unconfined_u:unconfined_r:groupadd_t:s0-s0:c0.c1023 key=(null)

Hash: groupadd,groupadd_t,etc_t,file,write

Version-Release number of selected component:
selinux-policy-3.13.1-63.fc21.noarch

Additional info:
reporter:       libreport-2.2.2
hashmarkername: setroubleshoot
kernel:         3.16.0-0.rc4.git2.1.fc22.x86_64
type:           libreport

Potential duplicate: bug 875387