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Failed to load module [veeamblksnap] on Oracle Linux 9 with UEK R8 kernel

Failed to load module [veeamblksnap] on Oracle Linux 9 with UEK R8 kernel

KB ID:	4732
Product:	Veeam Agent for Linux \| 6.3 \| 6.3.1
Published:	2025-05-02
Last Modified:	2025-05-02

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Article Applicability

This article is specifically regarding Oracle Linux 9 with UEK R8 kernel (6.12+):

[root@localhost ~]# cat /etc/os-release
PRETTY_NAME="Oracle Linux Server 9.5"

[root@localhost ~]# uname -r
6.12.0-0.20.20.el9uek.x86_64

For all other situations involving the error "Failed to load module [veeamsnap]", please refer to KB2260.

Challenge

Veeam Agent for Linux backup job fails with "Failed to load module [veeamblksnap] error":

[error] Failed to create volume snapshot
[error] Failed to take volume snapshot
[error] Failed to perform backup
[error] Veeam snapshot kernel module not found

Deployment of Veeam Agent for Linux from the Veeam Backup & Replication console fails with the error:

Failed to install Veeam Agent for Linux: Failed to install agent: non-matching package versions

Cause

UEK R8 is built with GCC 14, while Oracle Linux 9 ships GCC 11. This causes veeamsnap kernel module build failure because DKMS uses GCC 11:

[root@localhost ~]# cat /var/lib/dkms/blksnap/6.3.1.1016/build/make.log
DKMS (dkms-3.1.8) make.log for blksnap/6.3.1.1016 for kernel 6.12.0-0.20.20.el9uek.x86_64 (x86_64)
Tue Apr 29 04:08:26 PM EEST 2025
Building module(s)
# command: make -j2 KERNELRELEASE=6.12.0-0.20.20.el9uek.x86_64 -j2 -C /lib/modules/6.12.0-0.20.20.el9uek.x86_64/build M=/var/lib/dkms/blksnap/6.3.1.1016/build modules
make: Entering directory '/usr/src/kernels/6.12.0-0.20.20.el9uek.x86_64'
warning: the compiler differs from the one used to build the kernel
  The kernel was built by: gcc (GCC) 14.2.1 20240801 (Red Hat 14.2.1-1)
  You are using:           gcc (GCC) 11.5.0 20240719 (Red Hat 11.5.0-5.0.1)
  CC [M]  /var/lib/dkms/blksnap/6.3.1.1016/build/bdevfilter.o
  CC [M]  /var/lib/dkms/blksnap/6.3.1.1016/build/log.o
gcc: error: unrecognized command-line option ‘-fmin-function-alignment=16’; did you mean ‘-flimit-function-alignment’?
make[2]: *** [scripts/Makefile.build:229: /var/lib/dkms/blksnap/6.3.1.1016/build/bdevfilter.o] Error 1
make[2]: *** Waiting for unfinished jobs....
gcc: error: unrecognized command-line option ‘-fmin-function-alignment=16’; did you mean ‘-flimit-function-alignment’?
make[2]: *** [scripts/Makefile.build:229: /var/lib/dkms/blksnap/6.3.1.1016/build/log.o] Error 1
make[1]: *** [/usr/src/kernels/6.12.0-0.20.20.el9uek.x86_64/Makefile:1960: /var/lib/dkms/blksnap/6.3.1.1016/build] Error 2
make: *** [Makefile:226: __sub-make] Error 2
make: Leaving directory '/usr/src/kernels/6.12.0-0.20.20.el9uek.x86_64'

Solution

Tip: Hover over the command blocks below to see the copy to clipboard button.

Summary

This article will guide you through rebuilding the veeamsnap module using Software Collection (SCL) for GCC 14 SCL for GCC 14, which is shipped with UEK R8 kernel.

Rebuilding the veeamblksnap Module

Check the version of Veeam Agent for Linux that is installed using the following command:
Take note of the build number that is installed, it will be referred to in later steps as v.x.y.zzzz.

veeamconfig -v

Make sure the kernel-uek-devel package matching your running kernel is installed:

rpm -qa | grep kernel-uek-devel-$(uname -r)
                
            

Example output:

[root@localhost ~]# rpm -qa | grep kernel-uek-devel-$(uname -r)
kernel-uek-devel-6.12.0-0.20.20.el9uek.x86_64

Check dkms status output. blksnap/v.x.y.zzzz must have added status:

dkms status

Example output:

[root@localhost ~]# dkms status
blksnap/6.3.1.1016: added

Build blksnap/v.x.y.zzzz with dkms using GCC 14 SCL:
Replace v.x.y.zzzz with the installed build number from Step 1.

scl enable gcc-toolset-14 -- dkms install -m blksnap/v.x.y.zzzz --force

Example output:

[root@localhost ~]# scl enable gcc-toolset-14 -- dkms install -m blksnap/6.3.1.1016 --force
Deprecated feature: CLEAN (/var/lib/dkms/blksnap/6.3.1.1016/source/dkms.conf)
Sign command: /lib/modules/6.12.0-0.20.20.el9uek.x86_64/build/scripts/sign-file
Signing key: /var/lib/dkms/mok.key
Public certificate (MOK): /var/lib/dkms/mok.pub
Building module(s)..... done.
Signing module /var/lib/dkms/blksnap/6.3.1.1016/build/veeamblksnap.ko
Signing module /var/lib/dkms/blksnap/6.3.1.1016/build/bdevfilter.ko
Installing /lib/modules/6.12.0-0.20.20.el9uek.x86_64/extra/veeamblksnap.ko.xz
Installing /lib/modules/6.12.0-0.20.20.el9uek.x86_64/extra/bdevfilter.ko.xz
Running depmod..... done.

Verify that blksnap/v.x.y.zzzz has installed status for the kernel you are running:

uname -r

dkms status

Example output:

[root@localhost ~]# uname -r
6.12.0-0.20.20.el9uek.x86_64

[root@localhost ~]# dkms status
blksnap/6.3.1.1016, 6.12.0-0.20.20.el9uek.x86_64, x86_64: installed

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