/tmp/clamd.sock is not created. Even when adding a new path where clamav user can write to (eg. /var/run/clamv/clamd.sock), it still doesn't create. This results in

WARNING: Clamd was NOT notified: Can\'t connect to clamd through /tmp/clamd.sock: No such file or directory

Socket for clamd not found yet, retrying (5/1800)
... (multiple times)

And causes service to run out of memory.