Description of problem:
SELinux is preventing mount from read, write access on the chr_file loop-control.

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

If you believe that mount should be allowed read write access on the loop-control chr_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:
# ausearch -c 'mount' --raw | audit2allow -M my-mount
# semodule -X 300 -i my-mount.pp

Additional Information:
Source Context                system_u:system_r:snappy_t:s0
Target Context                system_u:object_r:loop_control_device_t:s0
Target Objects                loop-control [ chr_file ]
Source                        mount
Source Path                   mount
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.14.3-28.fc30.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 5.0.7-300.fc30.x86_64 #1 SMP Mon
                              Apr 8 18:28:09 UTC 2019 x86_64 x86_64
Alert Count                   2
First Seen                    2019-04-12 19:24:25 IST
Last Seen                     2019-04-12 19:24:36 IST
Local ID                      1a58fba5-02e3-4087-adf7-00c48f671a38

Raw Audit Messages
type=AVC msg=audit(1555077276.955:288): avc:  denied  { read write } for  pid=2257 comm="mount" name="loop-control" dev="devtmpfs" ino=2888 scontext=system_u:system_r:snappy_t:s0 tcontext=system_u:object_r:loop_control_device_t:s0 tclass=chr_file permissive=1


Hash: mount,snappy_t,loop_control_device_t,chr_file,read,write

Version-Release number of selected component:
selinux-policy-3.14.3-28.fc30.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.10.0
hashmarkername: setroubleshoot
kernel:         5.0.7-300.fc30.x86_64
type:           libreport

Potential duplicate: bug 1601273