Why did system reboot itself?

So yesterday around 20:54GMT I got a email alert:

 * linode... - (56441940) Host initiated restart - Completed Mon, 11 Sep 2017 20:54:42 GMT
 * linode... - (56443732) Lassie initiated boot: My Ubuntu 16.04 LTS Profile - Failed Mon, 11 Sep 2017 20:54:47 GMT

The system rebooted just fine, but I don't understand why it rebooted.

I had logged into the system the day before, CPU usage is very low 2-5%, and free -m showed only 20% of swap being used, after being up for 60 days.

I looked at /var/log/syslog, and it does not indicate how/why this system rebooted.

Was the machine this VPS on restarted, is that a possible reason for no messages related to this reboot reason in syslog?

The syslog entries look similar to the ones when I manually run "sudo reboot" on my box, except there are no "Stopping" or "Stopped" service messages in this case.

syslog snippet - nothing before 16:54 at all indicating why it shut down:

Sep 11 16:09:01 linode CRON[18682]: (root) CMD (  [ -x /usr/lib/php/sessionclean ] && /usr/lib/php/sessionclean)
Sep 11 16:54:50 linode rsyslogd: [origin software="rsyslogd" swVersion="8.16.0" x-pid="3345" x-info="http://www.rsyslog.com"] start
Sep 11 16:54:50 linode rsyslogd-2222: command 'KLogPermitNonKernelFacility' is currently not permitted - did you already set it via a RainerScript command (v6+ config)? [v8.16.0 try http://www.rsyslog.com/e/2222 ]
Sep 11 16:54:50 linode rsyslogd: rsyslogd's groupid changed to 108
Sep 11 16:54:50 linode rsyslogd: rsyslogd's userid changed to 104
Sep 11 16:54:50 linode rsyslogd-2039: Could not open output pipe '/dev/xconsole':: No such file or directory [v8.16.0 try http://www.rsyslog.com/e/2039 ]
Sep 11 16:54:50 linode rsyslogd-2007: action 'action 10' suspended, next retry is Mon Sep 11 16:55:20 2017 [v8.16.0 try http://www.rsyslog.com/e/2007 ]
Sep 11 16:54:50 linode kernel: Linux version 4.9.36-x86_64-linode85 ([email protected]) (gcc version 4.9.2 (Debian 4.9.2-10) ) #1 SMP Thu Jul 6 15:31:23 UTC 2017
Sep 11 16:54:50 linode kernel: Command line: root=/dev/sda console=tty1 console=ttyS0 ro  devtmpfs.mount=1
Sep 11 16:54:50 linode kernel: x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
Sep 11 16:54:50 linode kernel: x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
Sep 11 16:54:50 linode kernel: x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
Sep 11 16:54:50 linode kernel: x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
Sep 11 16:54:50 linode kernel: x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
Sep 11 16:54:50 linode kernel: x86/fpu: Using 'eager' FPU context switches.
Sep 11 16:54:50 linode kernel: e820: BIOS-provided physical RAM map:
Sep 11 16:54:50 linode kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable

system rebooted successfully.

6 Replies

It's not really a restart in the sense that it shut the Linode off and then powered it back on, so the name of the job is kind of confusing. Rather, the host was powered off (in this case by power failure, could also happen by emergency or scheduled maintenance), and your Linode was running at the time (for maintenance, Linode tries to cleanly shut down the running Linodes, but in the case of emergency maintenance, that isn't always possible), and when the host was powered back on, it started your Linode again.

"Host initiated restart" means the entire host was rebooted. Given the timeframe you've given, I'm guessing your Linode is in Atlanta, and thus was affected by the power outage: https://status.linode.com/incidents/kqhypy8v5cm8

Yes, it is in Atlanta, so that makes sense.

I'm surprised that nothing in syslog or auth.log corresponds to the email alert "Host initiated …"

I only see this in auth.log:

Sep 11 16:54:50 linode systemd-logind[3327]: Watching system buttons on /dev/input/event0 (Power Button)

Sep 11 16:54:50 linode systemd-logind[3327]: New seat seat0.

So between this and syslog, I should have expected log lines to indicate a host initiated restarts.

In any case, I do see that line in the manager.linode.com Host Job Queue section, so now I know what "host initiated" means, thanks!

Hi, I also got the issue about my system reboot itself still didn't get the solution and confuse what the problem is it Windows or System? and if I change my windows then it will solve the issue or change PC? Any suggestion?

Hey there! I'm sorry to hear your system rebooted itself. There can be a few reasons for this. Can you look at your Linode's boot log in Linode Manager and let us know what the entries say around the time of the reboot? If it's like what bwooster said in his initial post, where it's a host initiated restart, that means there was an issue related to the hardware your Linode is currently sitting on that required the entire host to reboot. This isn't something you would need to make any changes to your system to prevent.

If what you see instead is a Lassie initiated boot, that means your Linode was registered as unresponsive by our hypervisor and was forced to close. In this case, our shutdown watchdog called Lassie would boot the Linode back up. For Lassie initiated boots, you will want to look into your system's logs to see if you can find a reason for why your Linode was registered as unresponsive. You can read a bit more about how Lassie works here:

https://www.linode.com/docs/uptime/moni … n-watchdog">https://www.linode.com/docs/uptime/monitoring-and-maintaining-your-server#configuring-shutdown-watchdog

If there's anything else we can do, just let us know!

Mostly rebooting involve to hardware for failure system. System hardware is not instability or proper working due to the system automatically reboot itself and also deferent types of cause includes to failure system as Power supply, Graphics Card, External Device, RAM and also BIOS issues due to system restart itself.


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