[GTALUG] Debian has suddenly become unstable

[Aurelian Melinte]

Define crashing :) Is is simply rebooting or freezing or shuting down.

I would try to use journalctl to check logs; as detailed in the keyboard
thread. Normally the kernel should trace the oops/fault before crashing.

An alternative would be to boot an older kernel - it should be still
installed - and see if that is stable.

On 11/10/2023 18:30, Giles Orr via talk wrote:
> I have a Debian 12 system that's my daily driver.  In the last two
> days, it crashed twice when I was away from the keyboard and nothing
> was happening (around the same time of day now that I think about it).
> The system has previously been very stable, usually up for a month at
> a time with reboots only to pick up new kernels.  I should note that
> when I turned it on and ran upgrades on Monday after a week away, it
> upgraded a lot of packages for Debian release 12.2.
>
> I'm not great at debugging Linux crashes.  The `dmesg` command is
> useless, as it only shows the log since the last boot.  So I turned to
> /var/log/syslog.  What I noticed was this, the only line of
> consequence about a millisecond before the reboot:
>
>      2023-10-10T11:36:23.839046-04:00 sli7d systemd-modules-load[399]:
> Inserted module 'lp'
>
> I don't have a printer, and I hadn't just done a "print-to-PDF" or
> anything like that - the machine had been idle for a couple hours.
> This morning it crashed again, and milliseconds before the crash I
> found these (again, the machine was idle when this happened):
>
>      2023-10-11T12:20:54.647048-04:00 sli7d systemd-modules-load[382]:
> Inserted module 'lp'
>      2023-10-11T12:20:54.647254-04:00 sli7d systemd-modules-load[382]:
> Inserted module 'ppdev'
>      2023-10-11T12:20:54.647280-04:00 sli7d systemd-modules-load[382]:
> Inserted module 'parport_pc'
>      2023-10-11T12:20:54.647290-04:00 sli7d lvm[372]:   3 logical
> volume(s) in volume group "primary" monitored
>      2023-10-11T12:20:54.647302-04:00 sli7d systemd[1]: Starting
> systemd-journal-flush.service - Flush Journal to Persistent Storage...
>      2023-10-11T12:20:54.647312-04:00 sli7d systemd-udevd[398]: Using
> default interface naming scheme 'v252'.
>
> I just ran `apt full-upgrade` (right now) and watched it upgrade
> Samba.  Is it possible that Samba was triggering "lp"-related stuff
> which was causing the crash?  Although why it would cause a crash I
> don't know.  No new kernel (and thus no new modules).  I suppose I
> could reboot and select and older kernel and see if that was stable
> ...
>
> Suggestions on how to better debug this would be most welcome.  Does
> blacklisting the "lp" module sound like a good idea?  Any other ideas?
>
> Re-installing would be ... unpleasant.  This is my primary machine and
> heavily tweaked-up.  But I guess I'll do that if I have to.  Keeping
> it as a last resort though (daily crashes would get me there!).
>

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