Comments - Mariadb Killed by Ubuntu Kernel with OOM issue.
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You need to provide more information in order for anyone to be able to help (and for this kind of issue that may require diagnosis, perhaps rather JIRA or Zulip where developers are active). See for example MDEV-20698. Also note that MariaDB 10.7 is end-of-life, and there never was a 10.7.11 - the final version in that series was MariaDB 10.7.8. Ideally you should be running a current release in case it's a bug that has been fixed.
The version of Mariadb is 10.11.7