CentOS virt - Apr 2017 - Xen C6 kernel 4.9.13 and testing 4.9.15 only reboots.

The mystery gets more interesting... I now have a CentOS 7.3 Dell R710
server doing the exact same thing of rebooting immediately after the Xen
kernel load. Just to note this is a second system and not just the first
system with an update. I hope I'm not introducing something odd. They only
"interesting" thing I have done for historical reasons is to change
the
following /etc/sysconfig/grub line:
GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=6G,max:8G cpuinfo com1=115200,8n1
console=com1,tty loglvl=all guest_loglvl=all"
But I've done that on other servers without issue. In fact I have a Dell
R710 that DOES work with CentOS 7 and the new kernel... so confused.

On Fri, Mar 24, 2017 at 1:44 PM, Sarah Newman <srn at prgmr.com> wrote:
> On 03/24/2017 11:35 AM, PJ Welsh wrote:
> > As a follow up I was able to test fresh install on Dell R710 and a
Dell
> > R620 with success on CentOS 7.3 without issue on the new kernel.  My
new
> > plan will be to just move this C6 to one of the C7 I just created.
>
> That sounds like a compiler problem, since I think the C6 and C7 kernels
> are built from the same source.
>
> --Sarah
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> https://lists.centos.org/mailman/listinfo/centos-virt
>
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I ran into this also.

back up to an older kernel. At least that was my solution till a kernel 
came out that would boot.

It seems that some kernel builds are not friendly to xen.


On 03/28/2017 05:55 PM, PJ Welsh wrote:
> The mystery gets more interesting... I now have a CentOS 7.3 Dell R710 
> server doing the exact same thing of rebooting immediately after the 
> Xen kernel load. Just to note this is a second system and not just the 
> first system with an update. I hope I'm not introducing something odd. 
> They only "interesting" thing I have done for historical reasons
is to
> change the following /etc/sysconfig/grub line:
> GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=6G,max:8G cpuinfo com1=115200,8n1 
> console=com1,tty loglvl=all guest_loglvl=all"
> But I've done that on other servers without issue. In fact I have a 
> Dell R710 that DOES work with CentOS 7 and the new kernel... so confused.
>
> On Fri, Mar 24, 2017 at 1:44 PM, Sarah Newman <srn at prgmr.com 
> <mailto:srn at prgmr.com>> wrote:
>
>     On 03/24/2017 11:35 AM, PJ Welsh wrote:
>     > As a follow up I was able to test fresh install on Dell R710 and
>     a Dell
>     > R620 with success on CentOS 7.3 without issue on the new
>     kernel.  My new
>     > plan will be to just move this C6 to one of the C7 I just created.
>
>     That sounds like a compiler problem, since I think the C6 and C7
>     kernels are built from the same source.
>
>     --Sarah
>     _______________________________________________
>     CentOS-virt mailing list
>     CentOS-virt at centos.org <mailto:CentOS-virt at centos.org>
>     https://lists.centos.org/mailman/listinfo/centos-virt
>     <https://lists.centos.org/mailman/listinfo/centos-virt>
>
>
>
>
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> https://lists.centos.org/mailman/listinfo/centos-virt
-- 
Alvin Starr                   ||   voice: (905)513-7688
Netvel Inc.                   ||   Cell:  (416)806-0133
alvin at netvel.net              ||

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Maybe the BIOS versions are different on the two machines if they are
the same models.  Different disc controllers or modes set up?  Different
NICs or other add on cards?

On 03/28/2017 04:55 PM, PJ Welsh wrote:
> The mystery gets more interesting... I now have a CentOS 7.3 Dell R710
> server doing the exact same thing of rebooting immediately after the Xen
> kernel load. Just to note this is a second system and not just the first
> system with an update. I hope I'm not introducing something odd. They
> only "interesting" thing I have done for historical reasons is to
change
> the following /etc/sysconfig/grub line:
> GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=6G,max:8G cpuinfo com1=115200,8n1
> console=com1,tty loglvl=all guest_loglvl=all"
> But I've done that on other servers without issue. In fact I have a
Dell
> R710 that DOES work with CentOS 7 and the new kernel... so confused.
> 
> On Fri, Mar 24, 2017 at 1:44 PM, Sarah Newman <srn at prgmr.com
> <mailto:srn at prgmr.com>> wrote:
> 
>     On 03/24/2017 11:35 AM, PJ Welsh wrote:
>     > As a follow up I was able to test fresh install on Dell R710 and a
Dell
>     > R620 with success on CentOS 7.3 without issue on the new kernel. 
My new
>     > plan will be to just move this C6 to one of the C7 I just created.
> 
>     That sounds like a compiler problem, since I think the C6 and C7
>     kernels are built from the same source.
> 
>     --Sarah


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On 03/28/2017 04:55 PM, PJ Welsh wrote:
> The mystery gets more interesting... I now have a CentOS 7.3 Dell R710
> server doing the exact same thing of rebooting immediately after the Xen
> kernel load. Just to note this is a second system and not just the first
> system with an update. I hope I'm not introducing something odd. They
> only "interesting" thing I have done for historical reasons is to
change
> the following /etc/sysconfig/grub line:
> GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=6G,max:8G cpuinfo com1=115200,8n1
> console=com1,tty loglvl=all guest_loglvl=all"
> But I've done that on other servers without issue. In fact I have a
Dell
> R710 that DOES work with CentOS 7 and the new kernel... so confused.
> 
> On Fri, Mar 24, 2017 at 1:44 PM, Sarah Newman <srn at prgmr.com
> <mailto:srn at prgmr.com>> wrote:
> 
>     On 03/24/2017 11:35 AM, PJ Welsh wrote:
>     > As a follow up I was able to test fresh install on Dell R710 and a
Dell
>     > R620 with success on CentOS 7.3 without issue on the new kernel. 
My new
>     > plan will be to just move this C6 to one of the C7 I just created.
> 
>     That sounds like a compiler problem, since I think the C6 and C7
>     kernels are built from the same source.
> 
OK, I have a new CentOS-6 4.9.20-26 kernel here for testing:

https://people.centos.org/hughesjr/4.9.16/6/x86_64/

I am building the el7 one right now as well, it will be at:

https://people.centos.org/hughesjr/4.9.16/7/x86_64/

George and I found some issues with the 4.9.x config files for the xen
kernel.  Hopefully this one is much more stable as it has many changes
from the fedora/rhel type configs now (what is built into the kernel,
what is loaded as a kernel module, etc.)

Please test these kernels so we can get them released.

Thanks,
Johnny Hughes


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On Tue, Apr 4, 2017 at 11:13 AM, Johnny Hughes <johnny at centos.org>
wrote:
> On 03/28/2017 04:55 PM, PJ Welsh wrote:
> > The mystery gets more interesting... I now have a CentOS 7.3 Dell R710
> > server doing the exact same thing of rebooting immediately after the
Xen
> > kernel load. Just to note this is a second system and not just the
first
> > system with an update. I hope I'm not introducing something odd.
They
> > only "interesting" thing I have done for historical reasons
is to change
> > the following /etc/sysconfig/grub line:
> > GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=6G,max:8G cpuinfo
com1=115200,8n1
> > console=com1,tty loglvl=all guest_loglvl=all"
> > But I've done that on other servers without issue. In fact I have
a Dell
> > R710 that DOES work with CentOS 7 and the new kernel... so confused.
> >
> > On Fri, Mar 24, 2017 at 1:44 PM, Sarah Newman <srn at prgmr.com
> > <mailto:srn at prgmr.com>> wrote:
> >
> >     On 03/24/2017 11:35 AM, PJ Welsh wrote:
> >     > As a follow up I was able to test fresh install on Dell R710
and a
> Dell
> >     > R620 with success on CentOS 7.3 without issue on the new
kernel.
> My new
> >     > plan will be to just move this C6 to one of the C7 I just
created.
> >
> >     That sounds like a compiler problem, since I think the C6 and C7
> >     kernels are built from the same source.
> >
>
> OK, I have a new CentOS-6 4.9.20-26 kernel here for testing:
>
> https://people.centos.org/hughesjr/4.9.16/6/x86_64/
>
> I am building the el7 one right now as well, it will be at:
>
> https://people.centos.org/hughesjr/4.9.16/7/x86_64/
>
> George and I found some issues with the 4.9.x config files for the xen
> kernel.  Hopefully this one is much more stable as it has many changes
> from the fedora/rhel type configs now (what is built into the kernel,
> what is loaded as a kernel module, etc.)
>
> Please test these kernels so we can get them released.
>
> Thanks,
> Johnny Hughes
>
>
>
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> https://lists.centos.org/mailman/listinfo/centos-virt
>
>
CentOS-6 4.9.20-26 kernel exhibits the same constant
kernel-start-then-reboot issue when booting under the "CentOS Linux, with
Xen hypervisor" grub2 menu option. However, it *does* properly boot under
the "CentOS Linux (4.9.20-25.el7.x86_64) 7 (Core)" grub2 menu option!

A semi-close look at the /etc/grub2.cfg yields no discernible difference
between a properly functional Dell R620 and the non-properly functioning
Dell R710.

Sorry, I had been distracted with other issues and have not yet submitted
information to the xen-devel group yet.

Thanks
PJ
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On 03/28/2017 02:55 PM, PJ Welsh wrote:
> The mystery gets more interesting... I now have a CentOS 7.3 Dell R710
> server doing the exact same thing of rebooting immediately after the Xen
> kernel load. Just to note this is a second system and not just the first
> system with an update. I hope I'm not introducing something odd. They
only
> "interesting" thing I have done for historical reasons is to
change the
> following /etc/sysconfig/grub line:
> GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=6G,max:8G cpuinfo com1=115200,8n1
> console=com1,tty loglvl=all guest_loglvl=all"
> But I've done that on other servers without issue. In fact I have a
Dell
> R710 that DOES work with CentOS 7 and the new kernel... so confused.
I am having no similar issues with several Dell Proliant DL160p's and CentOS
6.
They are either G5 or G6, I don't recall which.

--Sarah

I've not gotten any bites from my posting on the xen-devel mailing list.
Here is the only one to-date:
https://lists.xen.org/archives/html/xen-devel/2017-04/msg01069.html
>From that email, there needs to be some hypervisor messages.
Does anyone know how to produce the hypervisor messages? I've already
removed the rhgb and quiet options from the boot.

Thanks
PJ

On Thu, Apr 6, 2017 at 11:21 PM, Sarah Newman <srn at prgmr.com> wrote:
> On 03/28/2017 02:55 PM, PJ Welsh wrote:
> > The mystery gets more interesting... I now have a CentOS 7.3 Dell R710
> > server doing the exact same thing of rebooting immediately after the
Xen
> > kernel load. Just to note this is a second system and not just the
first
> > system with an update. I hope I'm not introducing something odd.
They
> only
> > "interesting" thing I have done for historical reasons is to
change the
> > following /etc/sysconfig/grub line:
> > GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=6G,max:8G cpuinfo
com1=115200,8n1
> > console=com1,tty loglvl=all guest_loglvl=all"
> > But I've done that on other servers without issue. In fact I have
a Dell
> > R710 that DOES work with CentOS 7 and the new kernel... so confused.
>
> I am having no similar issues with several Dell Proliant DL160p's and
> CentOS 6.
> They are either G5 or G6, I don't recall which.
>
> --Sarah
>
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> https://lists.centos.org/mailman/listinfo/centos-virt
>
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