Bug#1078331: systemd: All non-default Journal Namespaces read from /dev/kmem

[Luca Boccassi]

Control: tags -1 moreinfo

On Fri, 09 Aug 2024 15:32:56 +0200 "F. Stoyan"
<fstoyan+reportbug at swapon.de> wrote:
> Package: systemd
> Version: 252.29-1~deb12u1
> Severity: normal
> 
> Dear Maintainer,
> 
> the manual page journald.conf(5) states very clearly:
> 
>   ReadKMsg=
>     Takes a boolean value. If enabled systemd-journal processes
/dev/kmsg
>     messages generated by the kernel. In the default journal
namespace
>     this option is enabled by default, it is disabled in all others.
> 
> But, every time a non default journal namespace is spawnd, it
> complains very loudly:
> 
> Aug 07 16:30:55 systemd[1]: Starting systemd-journald at bulk.service -
Journal Service for Namespace bulk...
> Aug 07 16:30:55 systemd-journald[2081]: Failed to open /dev/kmsg,
ignoring: Operation not permitted
> Aug 07 16:30:55 systemd[1]: Started systemd-journald at bulk.service -
Journal Service for Namespace bulk.
> Aug 07 16:31:25 systemd[1]: systemd-journald at bulk.service:
Deactivated successfully.
> 
> The namespace configuration is at follows:
> 
> $ systemd-analyze cat-config systemd/journald at bulk.conf
> # /etc/systemd/journald at bulk.conf
> # Use 'systemd-analyze cat-config systemd/journald at bulk.conf' to
display the full config.
> # See journald.conf(5) for details.
> 
> [Journal]
> Storage=volatile
> RuntimeMaxUse=16M
> ReadKMsg=no
> 
> It does not matter whether "ReadKMsg=no" is configured or not,
> it does not change the behavior.

Can you reproduce this on testing or unstable?

-- 
Kind regards,
Luca Boccassi
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