"max locked memory" parameter misconfigured.

Hello experts.

Environment

Exadata x6-2

Red Hat Enterprise Linux Server release 6.9 (Santiago)

Symptoms

alert log:

2018-02-24T14:29:49.290994+05:00 Per process system memlock (soft) limit = 64K...Expected per process system memlock (soft) limit to lock...ORA-07445: exception encountered: core dump...Process IPC0 died...Instance terminated 

Cause

Parameter "max locked memory" misconfigured.

[oracle@pr01adm01vm01 ~]$ ulimit -l64

--------------

Actually, the parameter is set.

If I connect to the server as oracle user:

If I connect to the server as root user:

There is no other limits.conf in /etc/security directory:

[root@pr01adm01vm01 ~]# ls -alt /etc/security/limits.*-rw-r--r-- 1 root root 2810 Feb 24 20:25 /etc/security/limits.conf-rw-r--r-- 1 root root 2811 Jan 29 02:37 /etc/security/limits.conf_ORIG-rw-r--r-- 1 root root 2018 Sep  7 07:16 /etc/security/limits.conf-orig