Description of problem:
Reproduce-able...

From a locked screen (I have fingerprint login enabled _which I love, BTW_ click the screen and slide up, or using center mouse/tp button scroll up.

At logon prompt, click cancel and drop back out to locked screen image.

Then just click-press anywhere on the screen, and gdm drops out, and you swap over to TTY0 (or whichever one is at CTRL+ALT+F1...)

TTY1 (or whichever one is at CTRL+ALT+F2) gets a notification pop AVC denial, but you don't see it b/c you're busy logging on to the new session which then gives the impression that gdm crashed, etc.  Anyway, the original session is fine,and just locked.  Logging in correctly at the original session produces expected results.

I don't have the fix, but that is definitely the (a) cause.  :-)
SELinux is preventing abrt-hook-ccpp from 'getattr' accesses on the file /usr/sbin/gdm.

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

If you believe that abrt-hook-ccpp should be allowed getattr access on the gdm 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 abrt-hook-ccpp /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                system_u:system_r:abrt_dump_oops_t:s0
Target Context                system_u:object_r:xdm_exec_t:s0
Target Objects                /usr/sbin/gdm [ file ]
Source                        abrt-hook-ccpp
Source Path                   abrt-hook-ccpp
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           gdm-3.16.3-1.fc22.x86_64
Policy RPM                    selinux-policy-3.13.1-128.18.fc22.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.2.6-200.fc22.x86_64 #1 SMP Tue
                              Nov 10 16:45:19 UTC 2015 x86_64 x86_64
Alert Count                   1
First Seen                    2015-11-20 12:28:30 PST
Last Seen                     2015-11-20 12:28:30 PST
Local ID                      acc29555-bc84-405b-a3f8-6fd6ec268f2e

Raw Audit Messages
type=AVC msg=audit(1448051310.152:833): avc:  denied  { getattr } for  pid=13485 comm="abrt-hook-ccpp" path="/usr/sbin/gdm" dev="dm-1" ino=399316 scontext=system_u:system_r:abrt_dump_oops_t:s0 tcontext=system_u:object_r:xdm_exec_t:s0 tclass=file permissive=0


Hash: abrt-hook-ccpp,abrt_dump_oops_t,xdm_exec_t,file,getattr

Version-Release number of selected component:
selinux-policy-3.13.1-128.18.fc22.noarch

Additional info:
reporter:       libreport-2.6.3
hashmarkername: setroubleshoot
kernel:         4.2.6-200.fc22.x86_64
type:           libreport

Potential duplicate: bug 1274741