Description of problem:
The problem occurred at upgrading from amavisd-2.10.1-5 to 2.11-0.3 (also to 2.11.0.4). Downgrading amavisd to 2.10.1-5 stops the problem occurring.
SELinux is preventing amavisd from 'read' accesses on the lnk_file log.

*****  Plugin catchall_boolean (89.3 confidence) suggests   ******************

If you want to allow antivirus to can scan system
Then you must tell SELinux about this by enabling the 'antivirus_can_scan_system' boolean.
You can read 'None' man page for more details.
Do
setsebool -P antivirus_can_scan_system 1

*****  Plugin catchall (11.6 confidence) suggests   **************************

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

Additional Information:
Source Context                system_u:system_r:antivirus_t:s0
Target Context                system_u:object_r:tmpfs_t:s0
Target Objects                log [ lnk_file ]
Source                        amavisd
Source Path                   amavisd
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-158.24.fc23.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.8.8-100.fc23.x86_64 #1 SMP Tue
                              Nov 15 18:51:53 UTC 2016 x86_64 x86_64
Alert Count                   31148
First Seen                    2016-07-27 14:09:15 BST
Last Seen                     2016-12-01 16:20:15 GMT
Local ID                      811f487c-3718-4b55-96cb-a117badfb236

Raw Audit Messages
type=AVC msg=audit(1480609215.558:15374): avc:  denied  { read } for  pid=13438 comm="/usr/sbin/amavi" name="log" dev="tmpfs" ino=1853790 scontext=system_u:system_r:antivirus_t:s0 tcontext=system_u:object_r:tmpfs_t:s0 tclass=lnk_file permissive=0


Hash: amavisd,antivirus_t,tmpfs_t,lnk_file,read

Version-Release number of selected component:
selinux-policy-3.13.1-158.24.fc23.noarch

Additional info:
reporter:       libreport-2.6.4
hashmarkername: setroubleshoot
kernel:         4.8.10-100.fc23.x86_64
type:           libreport