Re: Kernel panic on Xen virtualisation in Debian

From: Andreas Ziegler <ml@andreas-ziegler.de>
To: "Wei Liu" <wei.liu2@citrix.com>,
	"Ingo Jürgensmann" <ij@2013.bluespice.org>
Cc: 804079@bugs.debian.org, janprunk@gmail.com,
	xen-devel@lists.xen.org, george.dunlap@citrix.com,
	david.vrabel@citrix.com
Subject: Re: Kernel panic on Xen virtualisation in Debian
Date: Fri, 29 Jul 2016 13:45:55 +0200	[thread overview]
Message-ID: <5f3d24c5-0851-c661-99a1-b484e66613a2@andreas-ziegler.de> (raw)
In-Reply-To: <20160725131304.GL27082@citrix.com>

Hello Wei,

we tried with kernel 4.6 now, the crashed happened again, though.

next we want to try the Xen debug build, but we couldn't find any
information on how to enable debug for the build, perhaps you could give
us a hint.

- Andreas

-------- Original-Nachricht --------
Betreff: Re: [Xen-devel] Kernel panic on Xen virtualisation in Debian
Von: Wei Liu <wei.liu2@citrix.com>
An: Ingo Jürgensmann <ij@2013.bluespice.org>
Datum: 25.7.2016, 15:13:06

> On Mon, Jul 25, 2016 at 01:41:41PM +0200, Ingo Jürgensmann wrote:
>> On 25.07.2016 12:23, Wei Liu wrote:
>>
>> First, thank you for replying! Very much appreciated! :)
>>
>>> I did skim your emails. But the oops was happening in memcpy+0x6 which
>>> indicated it came back to the origin question why would it got an
>>> exception there.
>>>
>>> Just by staring at the code doesn't get me anywhere. Without a concrete
>>> reproduction of the issue, I'm afraid I can't provide more input here.
>>
>> Well, from my point of view, it happens quite often when accessing the
>> server via SSH. For example today it crashed when I wanted to add something
>> and after I clicked into putty and typed the first char. In another putty,
>> where I have my netconsole log open, I instantly saw the oops.
>>
>> But what exactly causing these kinds of reboots, I'm clueless as you too.
>> Only that I do experience far more frequent crashes when accessing the
>> server from workplace via putty on Windows than via SSH on OSX or Debian
>> Linux.
>>
>>> There are several moving parts:
>>> 0. Hardware
>>> 1. Xen hypervisor
>>> 2. Dom0 kernel
>>> Your report and the debian report suggested that Dom0 kernel is less
>>> likely to be the culprit because you've tried different Dom0 kernels.
>>
>> As just written in the other mail, I already tried kernel 4.5 from
>> backports. Still crashing.
>>
>>> As for Xen, not sure if you would be up for trying a debug build from
>>> source tree. That would help provide information on whether this is a
>>> bug in Xen or not.
>>
>> Will try to build from Debian source, but how to enable debug build?
>>
> 
> I was thinking about building directly from xen.git.
> 
> http://wiki.xenproject.org/wiki/Compiling_Xen_From_Source
> 
> Probably try the Xen 4.7 release.
> 
> Wei.
> 
>> -- 
>> Ciao...          //        http://blog.windfluechter.net
>>       Ingo     \X/     XMPP: ij@jabber.windfluechter.net
>>
>>
>> gpg pubkey:  http://www.juergensmann.de/ij_public_key.asc

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