CloudLinux 7.3 update for older kernels

Official announcement from CloudLinux 

Are you running an older kernel? This might cause server crashes during CloudLinux 7.3 update.

Here is how to upgrade safely.

During the recent update to CloudLinux OS version 7.3, some servers have crashed due to a race condition between kmem uncharge and charge reparenting. The issue is not present on last production kernel and only older kernels are affected.

It looks like you might still be running kernel-3.10.0-427.10.1.lve1.4.22 or older, and therefore you could be affected.

The safe upgrade to CloudLinux OS 7.3 is:

– update kernel to the latest one and reboot:

$ yum install kernel-3.10.0-427.18.2.lve1.4.24.el7 kmod-lve-1.4-24.el7
$ reboot

– update the rest of the system packages:
$ yum update