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

[Sarah Newman <srn@xxxxxxxxx>]

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 reasonable.
> 
>  
> 
> Any advice is much appreciated.
> 

Looks like it might be 
http://xen-devel.narkive.com/4ANUbmbs/rfh-kernel-oops-in-xen-netbk-rx-action-xenvif-gop-skb

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 ago.

Regards, Sarah

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