[systemd-devel] Antw: [EXT] Re: What causes "systemd-journald[3256]: Missed 127 kernel messages"

[Lennart Poettering]

On Di, 01.06.21 14:33, Ulrich Windl (Ulrich.Windl at rz.uni-regensburg.de) wrote:

> >>> Lennart Poettering <lennart at poettering.net> schrieb am 01.06.2021 um 13:39
> in
> Nachricht <YLYcdMZ+MgmcPdmG at gardel-login>:
> > On Di, 01.06.21 12:42, Ulrich Windl (Ulrich.Windl at rz.uni‑regensburg.de)
> wrote:
> >
> >> Jun 01 12:33:10 h18 systemd‑journald[3256]: Missed 195 kernel messages
> >>
> >> A few questions:
> >> 1) What causes this?
> >
> > Dunno. Something is massively flooding the kernel log buffer. Probably
> > some borked driver or so. "dmesg" might tell you what.
>
> I had meant the dropping of messages, not the creation of such. It seems it's
> intentional.

Ahumm. It does not. Generating such high frequency log messages is a
bug. Please report to your kernel maintainers.

> > You could also enlarge the kernel log buffer, see log_buf_mem= kernel
> > cmdline switch.
>
> Confused: So is it the kjernel dropping/loosing messages, or is it journald?

The kernel is generating them faster than userspace can keep up with them.

Lennart

--
Lennart Poettering, Berlin