Re: Kernel panic on Xen virtualisation in Debian

From: Wei Liu <wei.liu2@citrix.com>
To: Andreas Ziegler <ml@andreas-ziegler.de>
Cc: "Ingo Jürgensmann" <ij@2013.bluespice.org>,
	george.dunlap@citrix.com, xen-devel@lists.xen.org,
	janprunk@gmail.com, david.vrabel@citrix.com,
	"Wei Liu" <wei.liu2@citrix.com>
Subject: Re: Kernel panic on Xen virtualisation in Debian
Date: Mon, 25 Jul 2016 11:51:48 +0100	[thread overview]
Message-ID: <20160725105148.GF27082@citrix.com> (raw)
In-Reply-To: <b81918f6-5510-51e2-37da-596da185d504@andreas-ziegler.de>

On Mon, Jul 25, 2016 at 12:42:39PM +0200, Andreas Ziegler wrote:
> > On Mon, Jul 25, 2016 at 11:38:20AM +0200, Ingo Jürgensmann wrote:
> >> On 22.07.2016 12:21, Ingo Jürgensmann wrote:
> >>> On 22.07.2016 11:03, Ingo Jürgensmann wrote:
> >>>
> >>>> In the meanwhile, I activated IPv6 again on Tuesday evening and today
> >>>> the server crashed again some minutes ago. Here's the output from
> >>>> netconsole:
> >>> ... and the second subsequent crash:
> >>
> >> ... and another crash below...
> >>
> >> But in the meanwhile, I wonder if anyone except Andreas and I has some
> >> interest in fixing this issue, as there were absolutely no comments or
> >> feedback on my previous mails. Quite disappointing. :-/
> >>
> > 
> > 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.
> > 
> [...]
> > Your report and the debian report suggested that Dom0 kernel is less
> > likely to be the culprit because you've tried different Dom0 kernels.
> 
> yes we did. but nothing newer than 3.16 so far, we could try that, too.
> 

There is a 4.5 backport kernel for Jessie. Or you can compile a Dom0
kernel with your config file. If you go down that route, I suggest you
either use the newest long term support Linux kernel (4.4 according to
kernel.org) or the latest stable kernel.

> 
> > 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.
> 
> ok, we'll try!
> 
> 
> > As for hardware, it would be worth trying whether this issue happens on
> > other hardware platform.
> 
> as i wrote earlier on the list, we have two platforms which only have
> the Intel Xeon CPU in common, nothing else - and even that is from a
> very different generation.
> 
> 

OK.

Wei.

> Andreas.

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