Startup of clamav-milter doesn't finish. It hangs up and doesn't
return.

root@rolling-vm-freebsd2[727]# /usr/local/sbin/clamav-milter
^C#
root@rolling-vm-freebsd2[728]#

Output of `clamconf -n` is as following.

Checking configuration files in /usr/local/etc

Config file: clamd.conf
-----------------------
LogSyslog = "yes"
LogFacility = "LOG_MAIL"
PidFile = "/var/run/clamav/clamd.pid"
LocalSocket = "/var/run/clamav/clamd.sock"
User = "clamav"

Config file: freshclam.conf
---------------------------
LogSyslog = "yes"
LogFacility = "LOG_MAIL"
PidFile = "/var/run/clamav/freshclam.pid"
Checks = "24"
DatabaseMirror = "db.jp.clamav.net", "database.clamav.net"

Config file: clamav-milter.conf
-------------------------------
LogSyslog = "yes"
LogFacility = "LOG_MAIL"
PidFile = "/var/run/clamav/clamav-milter.pid"
User = "clamav"
ClamdSocket = "unix:/var/run/clamav/clamd.sock"
MilterSocket = "/var/run/clamav/clmilter.sock"
OnInfected = "Blackhole"
AddHeader = "Add"
VirusAction = "/usr/local/sbin/clamav-milter-virus-notice"
LogInfected = "Full"

Software settings
-----------------
Version: 0.103.0-rc
Optional features supported: MEMPOOL IPv6 BIGSTACK AUTOIT_EA06 BZIP2 LIBXML2 PCRE2 JSON RAR 

Database information
--------------------
Database directory: /var/db/clamav
bytecode.cvd: version 331, sigs: 94, built on Fri Sep 20 01:12:33 2019
daily.cvd: version 25904, sigs: 3931691, built on Mon Aug 17 22:02:24 2020
main.cvd: version 59, sigs: 4564902, built on Mon Nov 25 22:56:15 2019
Total number of signatures: 8496687

Platform information
--------------------
uname: FreeBSD 12.1-RELEASE-p8 FreeBSD 12.1-RELEASE-p8 GENERIC amd64
OS: freebsd12.1, ARCH: amd64, CPU: amd64
zlib version: 1.2.11 (1.2.11), compile flags: a9
platform id: 0x032378780800000000040201

Build information
-----------------
Clang: 4.2.1 Compatible FreeBSD Clang 8.0.1 (tags/RELEASE_801/final 366581) (4.2.1)
CPPFLAGS: 
CFLAGS: -O2 -pipe  -fstack-protector-strong -fno-strict-aliasing  
CXXFLAGS: -O2 -pipe -fstack-protector-strong -fno-strict-aliasing  
LDFLAGS: -lthr  -fstack-protector-strong 
Configure: '--disable-dependency-tracking' '--enable-bigstack' '--enable-clamdtop' '--libdir=/usr/local/lib' '--with-dbdir=/var/db/clamav' '--with-libcurl=/usr/local' '--with-openssl=/usr' '--with-system-libmspack=/usr/local/lib/libmspack.so' '--with-xml=/usr/local' '--disable-experimental' '--without-iconv' '--enable-ipv6' '--with-libjson=/usr/local' '--enable-milter' '--with-sendmail=/usr/sbin/sendmail' '--with-pcre' '--disable-check' '--enable-unrar' '--prefix=/usr/local' '--localstatedir=/var' '--mandir=/usr/local/man' '--disable-silent-rules' '--infodir=/usr/local/share/info/' '--build=amd64-portbld-freebsd12.1' 'build_alias=amd64-portbld-freebsd12.1' 'CXX=c++' 'CXXFLAGS=-O2 -pipe -fstack-protector-strong -fno-strict-aliasing  ' 'LDFLAGS= -lthr  -fstack-protector-strong ' 'LIBS=' 'CPPFLAGS=' 'CC=cc' 'CFLAGS=-O2 -pipe  -fstack-protector-strong -fno-strict-aliasing ' 'CPP=cpp' 'PKG_CONFIG=pkgconf' --enable-ltdl-convenience
sizeof(void*) = 8
Engine flevel: 120, dconf: 120