[Pkg-nagios-devel] Bug#1118973: Bug#1118973: monitoring-plugins-contrib: check_running_kernel fails on ProxMox kernels

[Fabian Grünbichler]

On Wed, 29 Oct 2025 00:47:22 +0100 Matija Nalis <mnalis-debianbug at voyager.hr> wrote:
> Hi Jan,
> 
> > I belive this should be fixed in Proxmox. 
> 
> OK, I've reported it to proxmox at https://bugzilla.proxmox.com/show_bug.cgi?id=6981
> 
> > There are many other situations where 3rd party kernel images
> > can/are used and potentially this can break the version detection.
> 
> Which is why this patch was written in such a way to avoid such
> possible breakages (i.e. it would only trigger if the versions are
> completely the same, except on-disk one having empty " ()" section at
> the end. That should not make any false positives or break any other
> detections).
> 
> > I'm still open for a more general solution.
> 
> More general solution might be to remove such empty section
> (whitespace plus empty parenthsesis) anywhere in the version string.
> That could be done in "on_disk_version" to be in more proper place,
> as you suggested.
> 
> But let's see what Proxmox people will reply first.

Hi!

The discrepancy seems to stem from CONFIG_VERSION_SIGNATURE not being
set in our kernel builds. While we can of course enable this, this alone
would not fix the nagios check. AFAICT (without setting up a full
reproducer, just looking at the script!) the script should use
`/proc/version_signature` to obtain the value for stripping from the
currently booted kernel, to compare whether the on-disk version is
identical to the booted one, instead of assuming the value of
CONFIG_VERSION_SIGNATURE has to match "`lsb-release -i -s` ..."

Regards,
Fabian