[systemd-bugs] [Bug 71148] Sysctl parametr (kernel.printk) don't apply at boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71148

Zbigniew Jedrzejewski-Szmek <zbyszek at in.waw.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #9 from Zbigniew Jedrzejewski-Szmek <zbyszek at in.waw.pl> ---
(In reply to comment #8)
> (In reply to comment #6)
> > 
> > > I read that this is related to udev: https://bugs.archlinux.org/task/33620
> > This is also unrelated. 33620 is about sysctl settings for network devices
> > which are only created after those settings have been already set. printk is
> > always there.
> yes and whole Comment 5 is about 'tcp_allowed_congestion_control' variable,
> not printk. should I open another bug report for this?
Just debug this one first.

> > Can you install the attached service in
> > /etc/systemd/system/monitor_printk.service, enable it with 'systemctl enable
> > monitor_printk', and post the output from the 'journalctl -b' after a reboot?
> ok, log attached
>From the log:
Nov 26 22:06:15 dell1210 cat[190]: 3        3        3        3
Nov 26 22:06:15 dell1210 inotifywait[176]: /proc/sys/kernel/printk OPEN
Nov 26 22:06:15 dell1210 inotifywait[176]: /proc/sys/kernel/printk ACCESS
Nov 26 22:06:15 dell1210 inotifywait[176]: /proc/sys/kernel/printk
CLOSE_NOWRITE,CLOSE
Nov 26 22:06:15 dell1210 systemd[1]: Started Apply Kernel Variables.
... and it doesn't seem to be set afterwards. Could you please check again
that it *is* actually set to something different after the boot?

So maybe your hypothesis that it is reset during the kernel oops is true.
What happens if you disable the restoring of the backlight, which should remove
the oops
(systemctl mask systemd-backlight at acpi_video0.service
systemd-backlight at acpi_video1.service)?

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