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Date: Thu, 7 Oct 2004 13:53:49 +0200 
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Subject: Re: Sudden Reboots
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Can this be some kind of misbehaved hardware watchdog (say, built into
motherboard or network card)?

> So, to recap:
> 
> Machine reboots at aprox 23hrs 57 minutes of uptime at 
> ~12:30pm.. Upgraded to latest 4.10p3 sources. Still reboots 
> at 23hrs 57mins, but at different time of day, ~8:15am. 
> Unplugged machine totally from AC and restarted. Still 
> reboots at 23:57 intervals, but time is now changed again, 
> ~2:55pm. Recompiled kernel, removing IPV6. Problem stops. Up 
> now for over 2 days for first time in weeks.
> 
> Note1: The 23:57 is the usual interval. Sometimes it varied 
> by a few minutes.
> Note2:  'healthd' showed normal operation of Power Supply 
> with no log entries.
> Note3: The IPV6 idea was gleaned from a Google search of 
> earlier postings on same problem.
> Note4: Another posting claimed a cure of this problem by 
> changing network card.
> 
> Observation: When the machine reboots itself, the time of the 
> reboots seems to 
> stay very close to 23:57 intervals. When you reboot on 
> command, the interval 
> stays the same, but the time of day changes, and does not 
> coincide with the 
> commanded reboot time. I have no conclusion about this.
> 
> Thanks to all who made suggestions.
> 
> -Jim Durham