On our production master servers, we have noticed that mysql is using more memory than the max calculated memory by mysqltuner.sql. As a result, after three days of activity, oom-killer is restarting mysqld process. Also we have observed that mysqld is swapping even when there is enough free memory.
MySQL Version: 5.6.31-77.0
CentOS Version: 7.2.1511
On one of the server, the issue was resolved after downgrading to 5.6.28-76.1.
Is there a known issue of memory leak in 5.6.31? If not, what relevant info do you want to investigate this.
Appreciate any help with this issue.