Thanks jsalisbury. Ill try on another kernel now.
The steps to reproduce on xenial:
sudo su -
apt install --yes apache2 haproxy
echo "
listen test
bind *:8776
bind :::8776
" > /etc/haproxy/haproxy.cfg
echo "
Listen 8776
<VirtualHost *:8776>
DocumentRoot /var/www/html
</VirtualHost>
" > /etc/apache2/sites-enabled/01-test.conf
systemctl restart haproxy
systemctl restart apache2
netstat -peanut | grep 8776
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https://bugs.launchpad.net/bugs/1720378
Title:
Two processes can bind to the same port
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