The use of 'DEBCONF_DEBUG='.*'' can be helpful here for debugging purpose.
Simply need to set and export.

Add this link:
https://wiki.debian.org/MaintainerScripts

with possibly the add of 'set -xv' in the clamav-daemon maintainer
scripts to find what is causing the loop.

I actually took a few scond to reproduce it inside a Xenial container
and I can clearly see the loop in action:

......
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate type) ..
debconf (db passwords): cache miss on clamav-daemon/LogRotate
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate type) ..
debconf (db passwords): cache miss on clamav-daemon/LogRotate
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate template) ..
debconf (db configdb): getfield done by config
debconf (developer): --> 30 question skipped
debconf (developer): <-- GO 
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate value) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate value) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to setfield(clamav-daemon/LogRotate value true) ..
debconf (db configdb): passing to config ..
debconf (developer): --> 0 ok
debconf (developer): <-- INPUT low clamav-daemon/LogFile
debconf (db configdb): trying to getfield(clamav-daemon/LogFile type) ..
debconf (db passwords): cache miss on clamav-daemon/LogFile
debconf (db configdb): trying to getfield(clamav-daemon/LogFile template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogFile template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogFile type) ..
debconf (db passwords): cache miss on clamav-daemon/LogFile
debconf (db configdb): trying to getfield(clamav-daemon/LogFile template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogFile template) ..
debconf (db configdb): getfield done by config
debconf (developer): --> 30 question skipped
debconf (developer): <-- GO 
debconf (db configdb): trying to getfield(clamav-daemon/LogFile value) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogFile value) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to setfield(clamav-daemon/LogFile value 
/var/log/clamav/clamav.log) ..
debconf (db configdb): passing to config ..
debconf (developer): --> 0 ok
debconf (developer): <-- METAGET clamav-daemon/LogFile value
debconf (db configdb): trying to getfield(clamav-daemon/LogFile value) ..
debconf (db configdb): getfield done by config
debconf (developer): --> 0 /var/log/clamav/clamav.log
debconf (developer): <-- INPUT low clamav-daemon/LogTime
debconf (db configdb): trying to getfield(clamav-daemon/LogTime type) ..
debconf (db passwords): cache miss on clamav-daemon/LogTime
debconf (db configdb): trying to getfield(clamav-daemon/LogTime template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogTime template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogTime type) ..
debconf (db passwords): cache miss on clamav-daemon/LogTime
debconf (db configdb): trying to getfield(clamav-daemon/LogTime template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogTime template) ..
debconf (db configdb): getfield done by config
debconf (developer): --> 30 question skipped
debconf (developer): <-- GO 
debconf (db configdb): trying to getfield(clamav-daemon/LogTime value) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogTime value) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to setfield(clamav-daemon/LogTime value true) ..
debconf (db configdb): passing to config ..
debconf (developer): --> 0 ok
debconf (developer): <-- INPUT low clamav-daemon/LogRotate
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate type) ..
debconf (db passwords): cache miss on clamav-daemon/LogRotate
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate type) ..
debconf (db passwords): cache miss on clamav-daemon/LogRotate
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate template) ..
debconf (db configdb): getfield done by config
debconf (developer): --> 30 question skipped
debconf (developer): <-- GO 
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate value) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogRotate value) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to setfield(clamav-daemon/LogRotate value true) ..
debconf (db configdb): passing to config ..
debconf (developer): --> 0 ok
debconf (developer): <-- INPUT low clamav-daemon/LogFile
debconf (db configdb): trying to getfield(clamav-daemon/LogFile type) ..
debconf (db passwords): cache miss on clamav-daemon/LogFile
debconf (db configdb): trying to getfield(clamav-daemon/LogFile template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogFile template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogFile type) ..
debconf (db passwords): cache miss on clamav-daemon/LogFile
debconf (db configdb): trying to getfield(clamav-daemon/LogFile template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogFile template) ..
debconf (db configdb): getfield done by config
debconf (developer): --> 30 question skipped
debconf (developer): <-- GO 
debconf (db configdb): trying to getfield(clamav-daemon/LogFile value) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogFile value) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to setfield(clamav-daemon/LogFile value 
/var/log/clamav/clamav.log) ..
debconf (db configdb): passing to config ..
debconf (developer): --> 0 ok
debconf (developer): <-- METAGET clamav-daemon/LogFile value
debconf (db configdb): trying to getfield(clamav-daemon/LogFile value) ..
debconf (db configdb): getfield done by config
debconf (developer): --> 0 /var/log/clamav/clamav.log
debconf (developer): <-- INPUT low clamav-daemon/LogTime
debconf (db configdb): trying to getfield(clamav-daemon/LogTime type) ..
debconf (db passwords): cache miss on clamav-daemon/LogTime
debconf (db configdb): trying to getfield(clamav-daemon/LogTime template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogTime template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogTime type) ..
debconf (db passwords): cache miss on clamav-daemon/LogTime
debconf (db configdb): trying to getfield(clamav-daemon/LogTime template) ..
debconf (db configdb): getfield done by config
debconf (db configdb): trying to getfield(clamav-daemon/LogTime template) ..
debconf (db configdb): getfield done by config
debconf (developer): --> 30 question skipped
......
<CTRL-C>

$ grep -i "trying to getfield" /tmp/deconfdebug.out | sort | uniq -c | sort -rn
    108 debconf (db configdb): trying to getfield(clamav-daemon/LogTime 
template) ..
    108 debconf (db configdb): trying to getfield(clamav-daemon/LogRotate 
template) ..
    108 debconf (db configdb): trying to getfield(clamav-daemon/LogFile 
template) ..
    .....

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https://bugs.launchpad.net/bugs/1860217

Title:
  dpkg-reconfigure clamav-daemon in infinite loop

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