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I have a Ubuntu machine which randomly reboots itself:

last reboot
reboot   system boot  2.6.32-042stab12 Sat Mar 25 23:48 - 12:42  (11:53)
reboot   system boot  2.6.32-042stab12 Wed Mar 22 18:28 - 12:42 (3+17:14)
reboot   system boot  2.6.32-042stab12 Sat Mar 18 05:10 - 12:42 (8+06:32)
reboot   system boot  2.6.32-042stab12 Thu Mar 16 13:52 - 12:42 (9+21:49)
reboot   system boot  2.6.32-042stab12 Thu Mar 16 09:50 - 13:52  (04:02)

I am trying to figure out why and stop it. I pasted the logs to pastebin here.

I am not doing these reboots. Also, it seems like there is nothing going on (like a crash, etc.) which would cause the server to reboot.

  • @Vlastimil No I don't have physical access, just SSH. And I have no idea what -- MARK -- is. – thesys Mar 26 '17 at 11:01
  • I just read somewhere else: "The --MARK-- messages are added at regular intervals just to indicate that syslogd is still working, even when no other messages are added. " – thesys Mar 26 '17 at 11:04
  • @Vlastimil I created a pastebin. If you require more logs just tell me which. – thesys Mar 26 '17 at 11:14
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    There's nothing in the logs. Is it a multiuser system and someone else reboots it? – Jan Mar 26 '17 at 11:28
  • did you deploy the unattended-updates service and allow it to reboot after updates if it was required by an update? – Phillip -Zyan K Lee- Stockmann Mar 26 '17 at 11:29
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Have you checked /proc/sys/kernel/panic? If it's value is 1 then server will immediately reboot on panic. Bad drivers can cause kernel panic.

If it's not panic, check last issue of reboot, maybe overheating is the issue.

last reboot

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