That is not a reboot.   That is a crash/power off or something else.

You might move your wake up the machine to say 7:40 and see if the
machine still does it at 8am or then does it at 7:50 (10 min after
reboot).

If it does it 10 minutes after reboot that is often the default for
the watchdog reset timer that will force power the machine (in bios)
if the OS does not touch the watchdog every so often.

If the machine has the watchdog enabled, there is a decent chance it
is not getting correctly restarted after hibernation.

On Tue, Nov 14, 2023 at 10:28 AM Patrick O'Callaghan
<pocallag...@gmail.com> wrote:
>
> On Tue, 2023-11-14 at 14:26 +0000, Barry wrote:
> >
> >
> > > On 14 Nov 2023, at 13:52, Patrick O'Callaghan
> > > <pocallag...@gmail.com> wrote:
> > >
> > > My system (both F38 and now F39) reboots itself every morning at
> > > 8am,
> > > yet nothing in the cron configuration is telling it to do that and
> > > I
> > > don't see anything obvious in the journal to cause it.
> > >
> > > How can I figure out what is triggering this? I know the
> > > description is
> > > vague, but there it is.
> > >
> >
> > Check for systemd timers as well. systemctl list-timers.
>
> None of them are scheduled for near that time.
> >
>
> > Does the journal show system shutdown was requested?
>
> No. Here is a snippet of today's journal:
>
> Nov 14 07:51:03 Bree systemd[1]: NetworkManager-dispatcher.service: 
> Deactivated successfully.
> Nov 14 07:51:17 Bree systemd[1]: plocate-updatedb.service: Deactivated 
> successfully.
> Nov 14 07:51:17 Bree systemd[1]: Finished plocate-updatedb.service - Update 
> the plocate database.
> Nov 14 07:51:17 Bree systemd[1]: plocate-updatedb.service: Consumed 9.667s 
> CPU time.
> Nov 14 07:52:29 Bree sshd[73704]: fatal: Timeout before authentication for 
> 43.153.185.216 port 51704
> -- Boot c04ce0f9f0b94587b88a1f8c0a2c4659 --
> Nov 14 08:00:27 Bree kernel: microcode: updated early: 0x19 -> 0x21, date = 
> 2019-02-13
> Nov 14 08:00:27 Bree kernel: Linux version 6.5.11-300.fc39.x86_64 
> (mockbuild@d23353abed4340e492bce6e111e27898) (gcc (GCC) 13.2.1 20231011 (Red 
> Hat 13.2.1-4), GNU ld version 2.40-1>
> Nov 14 08:00:27 Bree kernel: Command line: 
> BOOT_IMAGE=(hd2,gpt2)/vmlinuz-6.5.11-300.fc39.x86_64 
> root=UUID=8e1f7af4-c0bf-434e-b1c4-a9af2c810d56 ro rootflags=subvol=root 
> modprobe.bl>
> Nov 14 08:00:27 Bree kernel: BIOS-provided physical RAM map:
>
> The last entry before reboot is irrelevant (I run a small web server
> and fail2ban is constantly fending off attempted logins, mainly from
> China.
>
> Every day I'm getting the same thing at the same time.
>
> Full disclosure: I have a nightly hibernation/resume procedure which
> wakes the machine at 07:50, using a smart power plug. The journal shows
> that this is working as expected, and AFAIK is unrelated to the reboot.
> I've triple-checked the smart plug settings and toggled it manually to
> make sure.
>
> poc
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