* Migration fail randomly
@ 2015-09-15 10:57 Sander Klein
2015-09-15 13:24 ` Paolo Bonzini
0 siblings, 1 reply; 6+ messages in thread
From: Sander Klein @ 2015-09-15 10:57 UTC (permalink / raw)
To: kvm
Hi,
I'm running Debian Jessie with KVM 2.1 on 6 nodes with an NFS3 back-end
and sometimes when I migrate a VM it suddenly 'hangs'. The KVM process
is running on the new node, eating up all it's CPU cycles but it does
not respond to anything anymore. I don't see any errors logged and it
seems like the migration went fine except for the VM hanging.
It doesn't matter if I do a live migrate or a save and restore, it
happens with both ways.
Destroying and booting the VM fixes it of course and I can migrate it
afterwards, but after a couple of days the same happens again when I try
to migrate it.
The VM's range from Debian Squeeze (With a 3.2 kernel), Wheezy, and
Jessie.
Does anyone have an idea why this happens and if I can fix this?
Regards,
Sander
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Migration fail randomly
2015-09-15 10:57 Migration fail randomly Sander Klein
@ 2015-09-15 13:24 ` Paolo Bonzini
2015-09-15 13:36 ` Sander Klein
0 siblings, 1 reply; 6+ messages in thread
From: Paolo Bonzini @ 2015-09-15 13:24 UTC (permalink / raw)
To: Sander Klein, KVM list
On 15/09/2015 12:57, Sander Klein wrote:
>
> I'm running Debian Jessie with KVM 2.1 on 6 nodes with an NFS3 back-end
> and sometimes when I migrate a VM it suddenly 'hangs'. The KVM process
> is running on the new node, eating up all it's CPU cycles but it does
> not respond to anything anymore. I don't see any errors logged and it
> seems like the migration went fine except for the VM hanging.
>
> It doesn't matter if I do a live migrate or a save and restore, it
> happens with both ways.
>
> Destroying and booting the VM fixes it of course and I can migrate it
> afterwards, but after a couple of days the same happens again when I try
> to migrate it.
>
> The VM's range from Debian Squeeze (With a 3.2 kernel), Wheezy, and Jessie.
>
> Does anyone have an idea why this happens and if I can fix this?
What kernel runs in the host?
Paolo
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Migration fail randomly
2015-09-15 13:24 ` Paolo Bonzini
@ 2015-09-15 13:36 ` Sander Klein
2015-09-15 13:38 ` Paolo Bonzini
0 siblings, 1 reply; 6+ messages in thread
From: Sander Klein @ 2015-09-15 13:36 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: KVM list, kvm-owner
On 2015-09-15 15:24, Paolo Bonzini wrote:
>
> What kernel runs in the host?
The host is the standard Debian Jessie kernel, 3.16.7-ckt11-1+deb8u3.
Sander
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Migration fail randomly
2015-09-15 13:36 ` Sander Klein
@ 2015-09-15 13:38 ` Paolo Bonzini
2015-09-16 6:45 ` Sander Klein
0 siblings, 1 reply; 6+ messages in thread
From: Paolo Bonzini @ 2015-09-15 13:38 UTC (permalink / raw)
To: Sander Klein; +Cc: KVM list, kvm-owner
On 15/09/2015 15:36, Sander Klein wrote:
> On 2015-09-15 15:24, Paolo Bonzini wrote:
>>
>> What kernel runs in the host?
>
> The host is the standard Debian Jessie kernel, 3.16.7-ckt11-1+deb8u3.
Please try a more recent kernel (3.19 or newer).
Paolo
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Migration fail randomly
2015-09-15 13:38 ` Paolo Bonzini
@ 2015-09-16 6:45 ` Sander Klein
2015-09-24 8:50 ` Sander Klein
0 siblings, 1 reply; 6+ messages in thread
From: Sander Klein @ 2015-09-16 6:45 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: KVM list, kvm-owner
On 2015-09-15 15:38, Paolo Bonzini wrote:
> On 15/09/2015 15:36, Sander Klein wrote:
>> On 2015-09-15 15:24, Paolo Bonzini wrote:
>>>
>>> What kernel runs in the host?
>>
>> The host is the standard Debian Jessie kernel, 3.16.7-ckt11-1+deb8u3.
>
> Please try a more recent kernel (3.19 or newer).
>
Will do, I just pulled 4.1.6 from Debian Backports. It does take some
time before the problem might pop up so I will be back in a couple of
days/weeks.
Sander
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Migration fail randomly
2015-09-16 6:45 ` Sander Klein
@ 2015-09-24 8:50 ` Sander Klein
0 siblings, 0 replies; 6+ messages in thread
From: Sander Klein @ 2015-09-24 8:50 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: KVM list, kvm-owner
On 2015-09-16 08:45, Sander Klein wrote:
> On 2015-09-15 15:38, Paolo Bonzini wrote:
>> On 15/09/2015 15:36, Sander Klein wrote:
>>> On 2015-09-15 15:24, Paolo Bonzini wrote:
>>>>
>>>> What kernel runs in the host?
>>>
>>> The host is the standard Debian Jessie kernel, 3.16.7-ckt11-1+deb8u3.
>>
>> Please try a more recent kernel (3.19 or newer).
>>
>
> Will do, I just pulled 4.1.6 from Debian Backports. It does take some
> time before the problem might pop up so I will be back in a couple of
> days/weeks.
I could reproduce it again. All my KVM hosts are running 4.1.6, but the
migration still sometimes fails.
The VM must be running for a day or 2 to be able to trigger it. It does
not seem to happen to all VM's, some VM's seem to be more vulnerable to
this than others.
I'm not sure of the problem is in kernel or in userspace. Since no error
is given at all.
Regards,
Sander
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2015-09-24 8:50 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-09-15 10:57 Migration fail randomly Sander Klein
2015-09-15 13:24 ` Paolo Bonzini
2015-09-15 13:36 ` Sander Klein
2015-09-15 13:38 ` Paolo Bonzini
2015-09-16 6:45 ` Sander Klein
2015-09-24 8:50 ` Sander Klein
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