Description of problem:
SELinux is preventing firewalld from using the 'sys_nice' capabilities.

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

If you believe that firewalld should have the sys_nice capability 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 'firewalld' --raw | audit2allow -M my-firewalld
# semodule -X 300 -i my-firewalld.pp

Additional Information:
Source Context                system_u:system_r:firewalld_t:s0
Target Context                system_u:system_r:firewalld_t:s0
Target Objects                Unknown [ capability ]
Source                        firewalld
Source Path                   firewalld
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
SELinux Policy RPM            selinux-policy-3.14.5-31.fc32.noarch
Local Policy RPM              selinux-policy-targeted-3.14.5-31.fc32.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 5.6.0-0.rc7.git0.2.fc32.x86_64 #1
                              SMP Mon Mar 23 18:38:45 UTC 2020 x86_64 x86_64
Alert Count                   1
First Seen                    2020-03-24 22:36:31 GMT
Last Seen                     2020-03-24 22:36:31 GMT
Local ID                      c1ed5551-89da-4bb4-a56f-cd2735696a12

Raw Audit Messages
type=AVC msg=audit(1585089391.974:641): avc:  denied  { sys_nice } for  pid=775 comm="firewalld" capability=23  scontext=system_u:system_r:firewalld_t:s0 tcontext=system_u:system_r:firewalld_t:s0 tclass=capability permissive=0


Hash: firewalld,firewalld_t,firewalld_t,capability,sys_nice

Version-Release number of selected component:
selinux-policy-3.14.5-31.fc32.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.12.0
hashmarkername: setroubleshoot
kernel:         5.6.0-0.rc7.git0.2.fc32.x86_64
type:           libreport

Potential duplicate: bug 1812165