Server panic installation of kmodlve or LVE packages on CloudLinux 10 | Cloudlinux conversion

Issue

Server panics and crashes when trying to run a conversion from Almalinux 10 to CloudLinux 10 during kmodlve or LVE packages configuration.

Environment

• CloudLinux 10
• kmodlve
• LVE
• IBT

Solution

1. Please try to disable IBT:

• to force this for all installed kernels, run:

# grubby --update-kernel=ALL --args="ibt=off"

• verify the change:

# grubby --info=ALL | grep args

2. Reboot the server and continue installation.

Our develoipers are working on a stable fix within an internal task CLKRN-2052.

Cause

The LVE kernel module tries to perform a standard system operation (put_filesystem) because of Indirect Branch Tracking (IBT) being enabled on this server. 

This feature checks every software "jump" to ensure it is safe. 

The kernel flagges the LVE module's action as a potential security threat and immediately stops the system (Kernel Panic) to protect itself.