centos 8: debuginfo-install can't find kernel-debuginfo package

Question

I have a machine with CentOS-8 installed, kernel shipped with it is 4.18.0. I need to install debiginfo package:

% sudo dnf debuginfo-install kernel-4.18.0-193.19.1.el8_2.x86_64
enabling epel-modular-debuginfo repository
enabling epel-debuginfo repository
Last metadata expiration check: 0:22:04 ago on Thu 03 Dec 2020 04:51:14 PM EST.
Could not find debuginfo package for the following installed packages: kernel-4.18.0-193.19.1.el8_2.x86_64
Could not find debugsource package for the following installed packages: kernel-4.18.0-193.19.1.el8_2.x86_64
Dependencies resolved.
Nothing to do.
Complete!
%

Although yum search finds it:

% yum search kernel-debug
...
kernel-debug.x86_64 : kernel meta-package for the debug kernel
...
%

I thought debuginfo-install is the right way to install packages with debuginfo. What should I do to get it to work for me?

Thanks.

debuginfo packages only apply to userland, not the kernel itself. What you're trying to do doesn't make any sense. Why are you trying to do this? — Michael Hampton, Dec 03 '20 at 23:21
I need kernel with debug information in order to do performance analysis with `perf` — Mark, Dec 04 '20 at 01:15
So install the debug kernel. It looks like you already found it. — Michael Hampton, Dec 04 '20 at 10:18
Documentation about `perf` usage suggested to install kernel with debug symbols via `debuginfo-install`, so I followed it. — Mark, Dec 04 '20 at 12:49
@MichaelHampton, https://netdevconf.info/0.1/docs/sowa-perf-analytics.pdf slide 2 — Mark, Dec 07 '20 at 13:30
That's someone's slides from a conference talk, not really documentation, and it looks like you found an error in them. — Michael Hampton, Dec 07 '20 at 14:21

irritable_phd_syndrome · Accepted Answer · 2021-01-20T16:14:00.033

There are two ways of doing this. On CentOS 8,

You can modify /etc/yum.repos.d/CentOS-Debuginfo.repo to set enable=1 and then run yum install kernel-debuginfo or
You can do yum --enablerepo="base-debuginfo" install kernel-debuginfo

Either of these worked on my system. Be sure you have plenty of space on your disk. The installed size is 3.1GB.

NOTE :

You'll want to inspect the kernel version used in kernel-debuginfo (i.e. yum info kernel-debuginfo) to ensure that it is the same version as your kernel (i.e. uname -r).
If they differ, you may need to go hunting for the correct versions of kernel-debuginfo and kernel-debuginfo-common-x86_64. I used the baseurl in /etc/yum.repos.d/CentOS-Debuginfo.repo as a template to find where to look. For CentOS 8.1 look here.

centos 8: debuginfo-install can't find kernel-debuginfo package

1 Answers1