Unable to boot to different kernel

Rocky Linux Help & Support
1

I have the current kernel version of 5.14.0-503.14.1.el9_5.x86_64 and I need to install 5.14.0-503.40.1.el9_5.x86_64. Can someone help how boot to new kernel.

I have installed below packages
kernel-5.14.0-503.40.1.el9_5.x86_64.rpm
kernel-modules-5.14.0-503.40.1.el9_5.x86_64.rpm
kernel-core-5.14.0-503.40.1.el9_5.x86_64.rpm
kernel-modules-core-5.14.0-503.40.1.el9_5.x86_64.rpm
kernel-debug-core-5.14.0-503.40.1.el9_5.x86_64.rpm
kernel-modules-extra-5.14.0-503.40.1.el9_5.x86_64.rpm
kernel-debug-modules-core-5.14.0-503.40.1.el9_5.x86_64.rpm
kernel-tools-5.14.0-503.40.1.el9_5.x86_64.rpm
kernel-devel-5.14.0-503.40.1.el9_5.x86_64.rpm
kernel-tools-libs-5.14.0-503.40.1.el9_5.x86_64.rpm
kernel-headers-5.14.0-503.40.1.el9_5.x86_64.rpm

After rebooting not booting with new kernel.
ls -lthr /boot/vmlinuz-*
-rwxr-xr-x. 1 root root 14M Nov 15 2024 /boot/vmlinuz-5.14.0-503.14.1.el9_5.x86_64
-rwxr-xr-x. 1 root root 14M May 19 14:45 /boot/vmlinuz-0-rescue-1894eeb08b1d4c8d83e6acb4c46c8013

I am missing any packages to boot?

2

Both of those kernels are outdated; the current version is 5.14.0-570.21.1.el9_6.x86_64. You should probably run “dnf upgrade” to update to the newest kernel and then see what happens.

3

I do agree with that.

Only two kernel files are shown by the ‘ls’. One is “rescue”, a copy of an another and thus not interesting here.

The other, rpm -qf /boot/vmlinuz-5.14.0-503.14.1.el9_5* should show which package provides it.
Likewise, the corresponding 5.14.0-503.40.1.el9_5 package should provide a vmlinuz-file.
Why the file is not there?

rpm -Va kernel\*

should show if the installed kernel* packages have modified/missing files.
There are probably missing files, but how would package install “succeed”, if files are not written?

Btw, one can also list installed “per-kernel” packages with:

dnf rq --installonly

A reason to check what went wrong with install of the 503.40.1 packages is that that same issue might repeat with other kernel versions too.