Description of problem:
I was using a USB to Serial adapter that suddenly stop to respond.
SELinux is preventing boltd from 'write' accesses on the sock_file socket.

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

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

Additional Information:
Source Context                system_u:system_r:boltd_t:s0
Target Context                system_u:object_r:syslogd_var_run_t:s0
Target Objects                socket [ sock_file ]
Source                        boltd
Source Path                   boltd
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.14.1-39.fc28.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.17.12-200.fc28.x86_64 #1 SMP Fri
                              Aug 3 15:01:13 UTC 2018 x86_64 x86_64
Alert Count                   3
First Seen                    2018-08-09 13:21:59 CEST
Last Seen                     2018-08-09 14:35:12 CEST
Local ID                      0a6ac63f-f761-4506-a7f4-540cef73138f

Raw Audit Messages
type=AVC msg=audit(1533818112.837:1300): avc:  denied  { write } for  pid=5722 comm="boltd" name="socket" dev="tmpfs" ino=15161 scontext=system_u:system_r:boltd_t:s0 tcontext=system_u:object_r:syslogd_var_run_t:s0 tclass=sock_file permissive=1


Hash: boltd,boltd_t,syslogd_var_run_t,sock_file,write

Version-Release number of selected component:
selinux-policy-3.14.1-39.fc28.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.9.5
hashmarkername: setroubleshoot
kernel:         4.17.12-200.fc28.x86_64
type:           libreport