Please do the solution below.
1. Go to the file /etc/sysctl.conf, to edit ...
change the fs.grsecurity.tpe_restrict_all to 0.
2. check kernel.grsecurity.grsec_lock.
If it's "kernel.grsecurity.grsec_lock = 1", you must reboot your server to reload the configuration.
If it's "kernel.grsecurity.grsec_lock = 0", you must run sysctl -p to reload the configuration.
Reference from: http://docs.cloudlinux.com/index.html?grsecurity_extension.html