ntpd failed with no more memory error!

NTP service exit with "no more memory" error!
The issue casued NTP service stop after some days running.NTP service is important for the network.
But the NTP service from RedHat 8.0 has this issue I think!

It it about VmLock memory size.
Maybe related to memlock() call in NTP program.

Set the Max Locked Memory by
ulimit -l new_size

and cat /proc//status
to observe the memory using by NTPD.

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