I have only seen this bug happen in production environments, unfortunately.
I think to reproduce it, you need:
 - to start dnsmasq with --dhcp-optsfile and pass it a file that sets tags 
(like neutron does)
 - to have it answer to one request from the host mentioned in the configuration
 - to send SIGHUP to the daemon

We’re using kolla images based on debian bookworm, so I’ll not be able
to help you regarding Ubuntu specificities.

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https://bugs.launchpad.net/bugs/2026757

Title:
  dnsmasq on Ubuntu Jammy crashes on neutron-dhcp-agent updates

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