Re: [Xen-devel] several domU crashes after 4.1->4.8 live migration

[George Dunlap <dunlapg@xxxxxxxxx>]

On Thu, Feb 2, 2017 at 1:30 PM, Vincent Legout <vincent.legout@xxxxxxxxx> wrote:
> On Thu, Feb 02, 2017 at 12:05:09PM +0000, Andrew Cooper wrote :
>> On 02/02/17 07:58, Vincent Legout wrote:
>> > Hello,
>> >
>> > We had some issues after live migrating several domU from xen 4.1 to xen
>> > 4.8. We migrated around 200 domU and 5 crashed, from a few hours up to
>> > several days after the migration. All the domU had more than 1 year of
>> > uptime, and for example one crashed several days after the migration
>> > during a high load period.
>> >
>> > All 5 domU are running a 3.10 kernel (from 3.10.44 to 3.10.103). They
>> > have between 2GB and 16GB of RAM, and between 1 and 4 vCPUS.
>> >
>> > We use 3 types of machines (several PowerEdge C6100 (Intel L5640) and
>> > R710 (Intel L5520), and one C8220 (Intel E5-2650)). The C6100 and R710
>> > have 24 logical cores with HT enabled. The PowerEdge C8220 is only used
>> > for Xen 4.8, and has 32 logical cores with HT enabled. The C6100 and the
>> > R710 have 50GB of RAM, and the C8220 128GB. The xen 4.1 dom0 is running
>> > a 3.4.69 kernel, and the xen 4.8 one a 4.1.37 kernel.
>> >
>> > I've attached the most relevant parts of the domU kernel logs we could
>> > get. It seems the crashes came from different components of the kernel,
>> > though most of them seem to be related to memory.
>> >
>> > Would anyone have any idea if that's something that could be fixed? Or
>> > is it just that migrating from 4.1 to 4.8 is not supported?
>>
>> Do the VMs migrate normally in production?
>
> Thanks for the comment. Yes, the migrations took place normally, at
> least we didn't see anything wrong then. These crashes happened randomly
> on a few VMs only, and at least a few hours after the migration.

Sorry, I just want to clarify: Is it the case that before you tried to
upgrade, you often migrated VMs between your Xen 4.1 hosts without
problems?

In other words, is it *4.8* that's the problem, or is it *migration*
that's the problem?

 -George

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