Description of problem:
SELinux is preventing hostname from read, write access on the chr_file /dev/ttyUSB1.

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

If you believe that hostname should be allowed read write access on the ttyUSB1 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 'hostname' --raw | audit2allow -M my-hostname
# semodule -X 300 -i my-hostname.pp

Additional Information:
Source Context                unconfined_u:system_r:hostname_t:s0
Target Context                system_u:object_r:usbtty_device_t:s0
Target Objects                /dev/ttyUSB1 [ chr_file ]
Source                        hostname
Source Path                   hostname
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    <Unknown>
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.12.8-300.fc26.x86_64 #1 SMP Thu
                              Aug 17 15:30:20 UTC 2017 x86_64 x86_64
Alert Count                   2054
First Seen                    2017-09-11 20:28:14 CEST
Last Seen                     2017-09-13 20:02:19 CEST
Local ID                      d3c84549-37ba-4a6a-81db-c1840c5b7ece

Raw Audit Messages
type=AVC msg=audit(1505325739.477:57721): avc:  denied  { read write } for  pid=21108 comm="hostname" path="/dev/ttyUSB1" dev="devtmpfs" ino=7550467 scontext=unconfined_u:system_r:hostname_t:s0 tcontext=system_u:object_r:usbtty_device_t:s0 tclass=chr_file permissive=0


Hash: hostname,hostname_t,usbtty_device_t,chr_file,read,write


Additional info:
component:      selinux-policy
reporter:       libreport-2.9.3
hashmarkername: setroubleshoot
kernel:         4.14.14-300.fc27.x86_64
type:           libreport