Re: [Xen-users] Spontaneous reboots stock Xen 4.4 on Debian Jessie

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On Fri, Jul 8, 2016 at 2:27 PM, Andreas Pflug <pgadmin@xxxxxxxxxxxxxxxxx> wrote:
> Am 06.07.16 um 10:20 schrieb George Dunlap:
>> On Tue, Jul 5, 2016 at 3:53 AM, Jan Bakuwel <jan.bakuwel@xxxxxxxxx> wrote:
>>> Hi George,
>>>
>>> On 05/07/16 00:00, George Dunlap wrote:
>>>> On Sun, Jul 3, 2016 at 10:37 PM, Jan Bakuwel <jan.bakuwel@xxxxxxxxx> wrote:
>>>>> Hi there,
>>>>>
>>>>> I have two Dell T420's, 32GB, RAID6 array, running an up-to-date Debian
>>>>> Jessie stock with stock drbd, lvm and Xen (4.4) running a number of
>>>>> Windows and Linux guest VMs. Everything works fine ... until the server
>>>>> spontaneously reboots. Nothing in the xen logs, nor in syslog, as if
>>>>> someone pressed the reset button.
>>>>>
>>>>> Any suggestions where I should start digging?
>>>> Have you got a serial console hooked up?
>>>>
>>>> http://wiki.xenproject.org/wiki/Xen_Serial_Console
>>> I have remote access to the console as the server has a management
>>> interface (iDRAC).
>>>
>>>> For these kinds of reboots, catching it in the act is usually the only
>>>> way to figure out what was going on; and having the output of a serial
>>>> console is the most reliable way to catch the output as it died.
>>> That's the difficult part as initially it's all running smoothly.
>>> Wouldn't anything on the console not also end up in a log file though?
>> In case of a spontaneous reboot, almost never. A reboot only happens
>> when some drastic unrecoverable error occurs; and in that case,
>> there's never enough time to actually write out the data to disk.
> I'd suggest configuring netconsole to log kernel messages to a rsyslog
> server. You might get right-before-dying messages from the kernel that
> wouldn 't get a chance to go to kern.log before reboot.

But if it's from Xen, you won't get anything, because Xen itself
doesn't have any network drivers.

 -George

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