I will show how to get latest kernel from Koji for testing purpose. For your infomation, Koji build packages take times to appear on updates-testing repository.

The faster way to get latest kernel the is manually download from Koji. As example here, on this blog post I will show how I will load kernel kernel-5.10.4-200 to my Fedora 33 Workstation.

Firstly check the latest success build kernel here

For example, I will use this build

Information for build kernel-5.10.4-200.fc33
ID  1663265
Package Name    kernel
Version 5.10.4
Release 200.fc33
Epoch   
Source  git+https://src.fedoraproject.org/rpms/kernel.git#8c6d36397de31b4bed81f30aa8e01a0226db3e4c
Summary The Linux kernel
Description The kernel meta package
Built by    jforbes
State   complete
Volume  DEFAULT
Started Wed, 30 Dec 2020 18:00:59 UTC
Completed   Wed, 30 Dec 2020 20:39:38 UTC
Task    build (f33-candidate, /rpms/kernel.git:8c6d36397de31b4bed81f30aa8e01a0226db3e4c)
Extra   {'source': {'original_url': 'git+https://src.fedoraproject.org/rpms/kernel.git#8c6d36397de31b4bed81f30aa8e01a0226db3e4c'}}

How to install latest kernel from koji?

To grab all the rpms, I will use this command:

robbi@r0x: pts/0: /home/robbi/Documents/workspace/kernel-koji 0 files 8.0Kb
 └─ $ koji download-build --arch=x86_64 kernel-5.10.4-200.fc33

It will download almost 12 files (162mb) to my current directory

robbi@r0x: pts/0: /home/robbi/Documents/workspace/kernel-koji 12 files 162Mb
 └─ $ ls -lrta
total 164988
drwxr-xr-x. 5 robbi robbi     4096 Dec 31 16:28 ..
-rw-r--r--. 1 robbi robbi     8901 Dec 31 16:30 kernel-debug-5.10.4-200.fc33.x86_64.rpm
-rw-r--r--. 1 robbi robbi     8793 Dec 31 16:30 kernel-5.10.4-200.fc33.x86_64.rpm
-rw-r--r--. 1 robbi robbi   120133 Dec 31 16:30 kernel-modules-internal-5.10.4-200.fc33.x86_64.rpm
-rw-r--r--. 1 robbi robbi   130073 Dec 31 16:30 kernel-debug-modules-internal-5.10.4-200.fc33.x86_64.rpm
-rw-r--r--. 1 robbi robbi  2175141 Dec 31 16:30 kernel-debug-modules-extra-5.10.4-200.fc33.x86_64.rpm
-rw-r--r--. 1 robbi robbi  2093205 Dec 31 16:30 kernel-modules-extra-5.10.4-200.fc33.x86_64.rpm
-rw-r--r--. 1 robbi robbi 31889381 Dec 31 16:31 kernel-modules-5.10.4-200.fc33.x86_64.rpm
-rw-r--r--. 1 robbi robbi 34796405 Dec 31 16:31 kernel-core-5.10.4-200.fc33.x86_64.rpm
-rw-r--r--. 1 robbi robbi 36655709 Dec 31 16:32 kernel-debug-core-5.10.4-200.fc33.x86_64.rpm
-rw-r--r--. 1 robbi robbi 32596981 Dec 31 16:32 kernel-debug-modules-5.10.4-200.fc33.x86_64.rpm
-rw-r--r--. 1 robbi robbi 14263665 Dec 31 16:33 kernel-debug-devel-5.10.4-200.fc33.x86_64.rpm
drwxr-xr-x. 2 robbi robbi     4096 Dec 31 16:33 .
-rw-r--r--. 1 robbi robbi 14165873 Dec 31 16:33 kernel-devel-5.10.4-200.fc33.x86_64.rpm

Let install it

robbi@r0x: pts/0: /home/robbi/Documents/workspace/kernel-koji 12 files 162Mb
 └─ $ sudo dnf update kernel*
 .
 .
 .
================================================================================================================================================================================================
 Package                                              Architecture                           Version                                         Repository                                    Size
================================================================================================================================================================================================
Installing:
 kernel                                               x86_64                                 5.10.4-200.fc33                                 @commandline                                 8.6 k
 kernel-core                                          x86_64                                 5.10.4-200.fc33                                 @commandline                                  33 M
 kernel-devel                                         x86_64                                 5.10.4-200.fc33                                 @commandline                                  14 M
 kernel-modules                                       x86_64                                 5.10.4-200.fc33                                 @commandline                                  30 M
 kernel-modules-extra                                 x86_64                                 5.10.4-200.fc33                                 @commandline                                 2.0 M

Transaction Summary
================================================================================================================================================================================================
Install  5 Packages

Total size: 79 M
Installed size: 158 M
Is this ok [y/N]: y

After you are done, pls reboot and let check our machine :

robbi@r0x: pts/0: /home/robbi/Documents/workspace/kernel-koji 13 files 162Mb
 └─ $ uname -a
Linux r0x 5.10.4-200.fc33.x86_64 #1 SMP Wed Dec 30 18:20:23 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

For precautions, let check our dnf history

robbi@r0x: pts/0: /home/robbi/Documents/workspace/kernel-koji 13 files 162Mb
 └─ $ dnf history info last
Transaction ID : 17
Begin time     : Thu 31 Dec 2020 04:44:13 PM +08
Begin rpmdb    : 1448:2ae6f413e5cbe0a6650c5a4d848b6ab6bc1d536d
End time       : Thu 31 Dec 2020 04:46:34 PM +08 (141 seconds)
End rpmdb      : 1453:fa11ecb47317ee0e806a4adbe397892098732613
User           : robbi <robbi>
Return-Code    : Success
Releasever     : 33
Command Line   : update kernel-5.10.4-200.fc33.x86_64.rpm kernel-core-5.10.4-200.fc33.x86_64.rpm kernel-debug-5.10.4-200.fc33.x86_64.rpm kernel-debug-core-5.10.4-200.fc33.x86_64.rpm kernel-debug-devel-5.10.4-200.fc33.x86_64.rpm kernel-debug-modules-5.10.4-200.fc33.x86_64.rpm kernel-debug-modules-extra-5.10.4-200.fc33.x86_64.rpm kernel-debug-modules-internal-5.10.4-200.fc33.x86_64.rpm kernel-devel-5.10.4-200.fc33.x86_64.rpm kernel-modules-5.10.4-200.fc33.x86_64.rpm kernel-modules-extra-5.10.4-200.fc33.x86_64.rpm kernel-modules-internal-5.10.4-200.fc33.x86_64.rpm
Comment        :
Packages Altered:
    Install kernel-5.10.4-200.fc33.x86_64               @@commandline
    Install kernel-core-5.10.4-200.fc33.x86_64          @@commandline
    Install kernel-devel-5.10.4-200.fc33.x86_64         @@commandline
    Install kernel-modules-5.10.4-200.fc33.x86_64       @@commandline
    Install kernel-modules-extra-5.10.4-200.fc33.x86_64 @@commandline

Nice, now let prepare the test using tool that provided

$ sudo dnf install gcc git python3-fedora make libtirpc libtirpc-devel policycoreutils-python-utils
$ git clone https://pagure.io/kernel-tests.git
$ sudo semanage boolean -m --on selinuxuser_execheap #Allow testsuite to make their heap memory executable
$ cd kernel-tests
$ cp config.example .config 
$ vi .config # add your FAS username

Are you ready? Let execute the test

$ sudo ./runtests.sh
$ sudo ./runtests.sh -t performance

After you done, revert SELINUX heap memory executable permission

$ sudo semanage boolean -m --off selinuxuser_execheap

How to revert changes?

reboot your workstation and choose previous kernel from grub menu.

 $ uname -a
Linux r0x 5.9.16-200.fc33.x86_64 #1 SMP Mon Dec 21 14:08:22 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Open your terminal and execute sudo dnf history undo last :

 $ sudo dnf history undo last
Last metadata expiration check: 1:35:00 ago on Thu 31 Dec 2020 04:28:09 PM +08.
Undoing transaction 17, from Thu 31 Dec 2020 04:44:13 PM +08
    Install kernel-5.10.4-200.fc33.x86_64               @@commandline
    Install kernel-core-5.10.4-200.fc33.x86_64          @@commandline
    Install kernel-devel-5.10.4-200.fc33.x86_64         @@commandline
    Install kernel-modules-5.10.4-200.fc33.x86_64       @@commandline
    Install kernel-modules-extra-5.10.4-200.fc33.x86_64 @@commandline
Dependencies resolved.
================================================================================================================================================================================================
 Package                                             Architecture                          Version                                           Repository                                    Size
================================================================================================================================================================================================
Removing:
 kernel                                              x86_64                                5.10.4-200.fc33                                   @@commandline                                  0
 kernel-core                                         x86_64                                5.10.4-200.fc33                                   @@commandline                                 74 M
 kernel-devel                                        x86_64                                5.10.4-200.fc33                                   @@commandline                                 53 M
 kernel-modules                                      x86_64                                5.10.4-200.fc33                                   @@commandline                                 30 M
 kernel-modules-extra                                x86_64                                5.10.4-200.fc33                                   @@commandline                                1.9 M

Transaction Summary
================================================================================================================================================================================================
Remove  5 Packages

Freed space: 158 M
Is this ok [y/N]: y
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                                                                                                                                        1/1
  Erasing          : kernel-modules-extra-5.10.4-200.fc33.x86_64                                                                                                                            1/5
  Running scriptlet: kernel-modules-extra-5.10.4-200.fc33.x86_64                                                                                                                            1/5
  Erasing          : kernel-5.10.4-200.fc33.x86_64                                                                                                                                          2/5
  Erasing          : kernel-modules-5.10.4-200.fc33.x86_64                                                                                                                                  3/5
  Running scriptlet: kernel-modules-5.10.4-200.fc33.x86_64                                                                                                                                  3/5
  Running scriptlet: kernel-core-5.10.4-200.fc33.x86_64                                                                                                                                     4/5
  Erasing          : kernel-core-5.10.4-200.fc33.x86_64                                                                                                                                     4/5
warning: file /lib/modules/5.10.4-200.fc33.x86_64/updates: remove failed: No such file or directory

  Erasing          : kernel-devel-5.10.4-200.fc33.x86_64                                                                                                                                    5/5
  Running scriptlet: kernel-devel-5.10.4-200.fc33.x86_64                                                                                                                                    5/5
  Verifying        : kernel-5.10.4-200.fc33.x86_64                                                                                                                                          1/5
  Verifying        : kernel-core-5.10.4-200.fc33.x86_64                                                                                                                                     2/5
  Verifying        : kernel-devel-5.10.4-200.fc33.x86_64                                                                                                                                    3/5
  Verifying        : kernel-modules-5.10.4-200.fc33.x86_64                                                                                                                                  4/5
  Verifying        : kernel-modules-extra-5.10.4-200.fc33.x86_64                                                                                                                            5/5

Removed:
  kernel-5.10.4-200.fc33.x86_64  kernel-core-5.10.4-200.fc33.x86_64  kernel-devel-5.10.4-200.fc33.x86_64  kernel-modules-5.10.4-200.fc33.x86_64  kernel-modules-extra-5.10.4-200.fc33.x86_64

Complete!

You can reboot to check but at this point the kernel we install from koji are already removed from our system succesfully.

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