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Date: Fri, 15 May 2015 09:37:48 +0200
From: Gerhard Wiesinger <lists@wiesinger.com>
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Subject: Re: [Qemu-devel] Kernel Panic on Yum update
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To: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel <qemu-devel@nongnu.org>

On 15.05.2015 08:51, Paolo Bonzini wrote:
>
> On 15/05/2015 08:34, Gerhard Wiesinger wrote:
>> Helllo,
>>
>> I'm using latest qemu-kvm-2.3.0-3.fc21.x86_64 from libvirt repository
>> (updated afterwards). Running yum regularly crashes the VM like below.
>> VM is stripped down to minimum memory requirements (256MB) for owncloud.
>> See below.
>>
>> Looks like a problem in virtio-net or a kernel bug with low memory
>> situations.
> You're simply running out of memory.  Yum can be a memory hog.
>
>

Yes, yum takes memory. But there is ~2.2 GB virt memory available. That 
should be enough. Therefore I think it is a kernel problem. As in 
previous crashes on the mailing list there is a lot of swap available 
(2GB) which isn't touched in ANY way.

Under normal conditions without yum:
free
               total        used        free      shared buff/cache   
available
Mem:         243036      132540       12716       15520 97780       74964
Swap:       2064380           0     2064380

And running it after reboot works fine (with all the services up).

Ciao,
Gerhard