On Tue, 2023-11-14 at 10:36 -0600, Roger Heflin wrote:
> 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.

Tried that, but the machine still boots at 08:00. I logged the watchdog
status in the hibernate resume script:

Wed 15 Nov 07:40:46 GMT 2023
Device:        /dev/watchdog0
Identity:      iTCO_wdt [version 2]
Timeout:       30 seconds
Timeleft:       2 seconds
Pre-timeout:    0 seconds
FLAG           DESCRIPTION               STATUS BOOT-STATUS
KEEPALIVEPING  Keep alive ping reply          1           0
MAGICCLOSE     Supports magic close char      0           0
SETTIMEOUT     Set timeout (in seconds)       0           0

Interestingly, the running watchdog status (after the forced boot) has
a different identity field:

$ wdctl
Device:        /dev/watchdog0
Identity:      iamt_wdt [version 1]
Timeout:       120 seconds
FLAG           DESCRIPTION              STATUS BOOT-STATUS
KEEPALIVEPING  Keep alive ping reply         1           0
SETTIMEOUT     Set timeout (in seconds)      0           0
ALARMONLY      Not trigger reboot            0           0

but I'm not sure that's relevant. Either way, the forced boot still
happens at 08:00 and not after a 10-minute timeout, so the mystery
continues.

poc
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