MySQL would be stopped and restarted, would that take care of the /tmp backlog ?
If not, then it could indeed be an issue.
Moving files from /tmp to /var/tmp/mysql would need extra care (to not inject rogue files). Maybe asking MySQL to commit /tmp backlog before upgrade (if that makes sense) is the safest ?
MySQL would be stopped and restarted, would that take care of the /tmp backlog ?
If not, then it could indeed be an issue.
Moving files from /tmp to /var/tmp/mysql would need extra care (to not inject rogue files). Maybe asking MySQL to commit /tmp backlog before upgrade (if that makes sense) is the safest ?