When users experience memory usage issues with any software, including MySQL®, their first response is to think that its a symptom of a memory leak. As this story will show, this is not always the case. This story is about a bug. All Percona Support customers are eligible for bug fixes, but their options vary. [&]

https://www.percona.com/blog/2019/05/02/mysql-memory-management-memory-allocators-and-operating-system/