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Re: [Xen-users] Dom0 crash on hvm creation

To: "Brendan Wood" <bwood@xxxxxxxxxxxxx>
Subject: Re: [Xen-users] Dom0 crash on hvm creation
From: "HyunSung Jang" <hsjang@xxxxxxxxx>
Date: Thu, 6 Dec 2007 13:18:28 +0900
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hello brendan,
I just installed CentOS 5.1 for dom0 and tried to install 32bit centos 5.1 on my 64bit dom0.
but this is still doesn't work, i think
my machine is dell pe1950 which is support both vmx and pae.

here is what i do exactly,
first, install centos 5.1 to brand new machine for dom0.
[root@vmp-1 ~]# uname -a
Linux vmp-1.domain.com 2.6.18-53.el5xen #1 SMP Mon Nov 12 02:46:57 EST 2007 x86_64 x86_64 x86_64 GNU/Linux
and i create xen pv guest using i386 boot kernel for centos 5.1
now, it seems ok, everything going well
but while installing package, it prints out kernel panic message and give me dom0's shell prompt.
my BIOS is newest, so i don't think it is BIOS problum for me.
any idea for this?
On 12/4/07, Brendan Wood <bwood@xxxxxxxxxxxxx> wrote:

Hello Mark,

Thank you for responding. I actually just got it working after a BIOS
update to our servers and the 3.1 xen build from source. I just now put
together an rpm to deploy to fix it on all the machines. It seemed to be
a BIOS problem that was causing the complete freezing, though Xen was
still performing unreliably until we upgraded to 3.1.

I'm glad to hear that Centos 5.1 is out now, though, as it will be a lot
easier to upgrade than to support our own xen rpms for now. I'll check
it out. It would actually be interesting to see if the new version works
with the original BIOS as well.



On Mon, Dec 03, 2007 at 08:02:15PM -0800, Mark Williamson wrote:
> Hi Brendan,
> CentOS 5.1 is available now, bundling a Xen derived from 3.1.  Are you able to
> try this and see if it solves your problem?  The HVM support in 3.1 is much
> improved from 3.0.3 (as evidenced by Redhat now talking about Windows guests,
> IIRC).
> Cheers,
> Mark
> On Friday 16 November 2007, Brendan Wood wrote:
> > Hello,
> >
> > I'm having some trouble trying to run Centos4 hvm domU domains on a Centos
> > 5 server running kernel-2.6.18-8.1.15.el5.centos.plusxen, using xen
> > 3.0.3-25.0.4.el5 on x86_64 architecture. On three out of four of the
> > servers I've tried, I will get a total system (dom0) crash when trying to
> > start a fully virtualized domU. I will run `xm create xen_test`, it will
> > start, then return to the command line, but invariably within five to ten
> > seconds the entire system will freeze. I get no error messages to any of
> > the logs, or anything output to the console. Absolutely nothing responds. I
> > can't find any record of the error after power cycling the machine.
> >
> > The interesting thing is that on one server of the same type out of the
> > four I've tried, it works absolutely fine every time. I've tried moving the
> > hvm image and config to the other servers but those fail as well. There
> > might be some differences in the hardware components used but the servers
> > have the same board and same CPUs, with the same version of Centos and Xen.
> >
> > I did read that some people were having problems with hvm crashing the dom0
> > a while back on the list when using AMD 64 cpus. I don't know if that would
> > apply to this version of xen or if it might be somehow related, but I
> > thought it was a good chance. Porting xen 3.1 to the kernel-xen RPM is an
> > option, but one I'd really like to avoid if possible.
> >
> > Thanks,
> >
> > Brendan Wood
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> --
> Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
> Mark: To answer a question with a question: What use is a skateboard?
> Dave: Skateboards have wheels.
> Mark: My wheel has a wheel!

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