Re: [Xen-users] xen-4.4.0 and unexpected system reboot

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-06-24 at 16:40 -0400, squidmobile@xxxxxxxxxxx wrote:
> 24 jun 2014
> 
> greetings,
> 
> >It's rather hard to say based on the available information I'm afraid.
> >All I can suggest is that you configure a serial console or something so
> >that if it happens again you have some logs. You might find something
> >in /var/log/ on the dom0, but it seems unlikely.
> 
> *sigh*  no serial console available to dom0; just the standard svga
> console.  and eighteen months is a rather long time to have a
> physical device just sitting there on the off-chance that something
> might happen.

Right.

One other thing you could try is "noreboot" on Xen's command line. This
will mean that if it does panic/crash it'll just sit there with whatever
was on the screen until you press the reset button on the case so you
can take a photo or transcribe it by hand etc. Of course having the
machine unavailable until you can press a button may not be acceptable
in your scenario.

You could also try setting up kexec/kdump so that on panic instead of
rebooting it will instead launch another kernel with limited RAM from
where you can scrobble around to gather state etc. Setting that up is
pretty tricky though (perhaps your distro has done the hard work).

> i checked the /var/log/messages file immediately after rebooting
> the system.  literally nothing.  the last entry before the reboot
> was the typical chatter found in /var/log/messages, and then the
> syslogd restart message.  a normal shutdown via nut or by hand
> (shutdown -[hr] now) would make a number of entries about daemons
> and devices shutting down.  in this case, nothing.
> 
> this behavior looks more typical of the reboot command instead of
> the shutdown command, or maybe a hardware fault that triggered a
> reboot.  still, this is the first time i've seen that under xen, so
> i'm considering all possibilities.
> 
> i'm sorry that this gives you so little with which to work.
> 
> thanks for the time and assistance.
> frank smith
> 



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