Description of problem:
SELinux is preventing pmdalinux from 'unix_read' accesses on the shared memory Unknown.

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

If you believe that pmdalinux should be allowed unix_read access on the Unknown shm 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:
# ausearch -c 'pmdalinux' --raw | audit2allow -M my-pmdalinux
# semodule -X 300 -i my-pmdalinux.pp

Additional Information:
Source Context                system_u:system_r:pcp_pmcd_t:s0
Target Context                system_u:system_r:postgresql_t:s0
Target Objects                Unknown [ shm ]
Source                        pmdalinux
Source Path                   pmdalinux
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.14.1-40.fc28.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.17.14-202.fc28.x86_64 #1 SMP Wed
                              Aug 15 12:29:25 UTC 2018 x86_64 x86_64
Alert Count                   4
First Seen                    2018-08-17 09:50:01 EDT
Last Seen                     2018-08-17 09:51:01 EDT
Local ID                      61109cc0-9f5c-4aaf-964f-0ad038fdc93f

Raw Audit Messages
type=AVC msg=audit(1534513861.976:9755): avc:  denied  { unix_read } for  pid=1726 comm="pmdalinux" key=5432001  scontext=system_u:system_r:pcp_pmcd_t:s0 tcontext=system_u:system_r:postgresql_t:s0 tclass=shm permissive=0


Hash: pmdalinux,pcp_pmcd_t,postgresql_t,shm,unix_read

Version-Release number of selected component:
selinux-policy-3.14.1-40.fc28.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.9.5
hashmarkername: setroubleshoot
kernel:         4.17.14-202.fc28.x86_64
type:           libreport