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Re: [Xen-users] BUG: unable to handle kernel paging request Xen 4.4.2

  • To: "'Sarah Newman'" <srn@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxx>
  • From: "Brandon" <brandon@xxxxxxxxxxxxx>
  • Date: Wed, 1 Jul 2015 09:08:39 -0700
  • Delivery-date: Wed, 01 Jul 2015 16:09:06 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>
  • Thread-index: AQFMmuQ6aUtN5tNaLbU+/ImnvMYPDgKQcptjnrp2a4A=

Hi Sarah and List,

Thanks so much for the reply and info.

I am running 3.10.68-11.el6.centos.alt.x86_64 most everywhere so I will
upgrade asap.

-----Original Message-----
From: Sarah Newman [mailto:srn@xxxxxxxxx] 
Sent: Wednesday, July 01, 2015 8:55 AM
To: Brandon; xen-users@xxxxxxxxxxxxx
Subject: Re: [Xen-users] BUG: unable to handle kernel paging request Xen

On 07/01/2015 07:56 AM, Brandon wrote:
> Hi Xen User List,
> I have a recurring bug shown below which is causing me serious problems.
It's so serious my company is considering abandoning XEN for KVM but, we
> have many XEN servers and VMs so this is not an easy decision.   My
CentOS6 Xen servers are built using SolusVM install script and run Windows
2008 R2
> / 2012 R1 guests.   They run great except for this recurring bug.   
> The servers are Xen 4.4.2 (and some slightly earlier versions) using XL
Toolstack and we've been encountering this showstopper bug for the last 6
> months or so randomly on different servers.   When this BUG is encountered
my VM guests will no longer be able to boot if they are restarted.   I am
> forced to reboot the entire server interrupting all VM guests.   I've had
about 6-7 encounters with this bug.   One time it hard crashed the server
> while I was migrating a VM to another server.   The other times I have
made it to the weekend so I can do a graceful reboot.
> Does anyone know of this issue?
> Is there any paid Xen support that can debug and solve this?   I'm using
CentOS6 so this is not a RHEL box under support contract but, we'd probably
> be willing to pay in a per incident type scenario if the cost was
> Any advice is much appreciated.

Looks like it might be

According to Wei Liu the bug is gone in version 3.12 or later, though I have
not reviewed the code myself. Xen4CentOS released kernel-3.18.12-11 2 days

Regards, Sarah

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