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Date: Fri, 15 May 2015 08:51:20 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] Kernel Panic on Yum update
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To: Gerhard Wiesinger <lists@wiesinger.com>, qemu-devel <qemu-devel@nongnu.org>



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.

Paolo

> Any ideas?
> 
> Thank you.
> 
> Ciao,
> Gerhard
> 
> http://www.wiesinger.com/
> 
> kernel: swapper/0: page allocation failure: order:0, mode:0x20
> kernel: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.19.7-200.fc21.x86_64 #1
> kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 1.8.1-20150414_141626-myhost.mydomain 04/01/2014
> kernel: 0000000000000000 c35c12d2c14e1ce8 ffff88000fc03ac8 ffffffff8176f1f7
> kernel: 0000000000000000 0000000000000020 ffff88000fc03b58 ffffffff811a1c9e
> kernel: 0000000000000000 0000000000000040 ffff880000000000 ffff88000ffcdb28
> kernel: Call Trace:
> kernel: <IRQ>  [<ffffffff8176f1f7>] dump_stack+0x45/0x57
> kernel: [<ffffffff811a1c9e>] warn_alloc_failed+0xfe/0x170
> kernel: [<ffffffff811a607a>] __alloc_pages_nodemask+0x7ca/0xb10
> kernel: [<ffffffff81691854>] ? nf_hook_slow+0x84/0x130
> kernel: [<ffffffff816482df>] __alloc_page_frag+0x12f/0x150
> kernel: [<ffffffff8164832f>] __netdev_alloc_frag+0x2f/0x50
> kernel: [<ffffffff8164d446>] __alloc_rx_skb+0xe6/0x110
> kernel: [<ffffffff8164d48f>] __netdev_alloc_skb+0x1f/0x40
> kernel: [<ffffffffa008b125>] page_to_skb+0x65/0x370 [virtio_net]
> kernel: [<ffffffffa008d611>] virtnet_receive+0x2c1/0x980 [virtio_net]
> kernel: [<ffffffffa008dcf1>] virtnet_poll+0x21/0x90 [virtio_net]
> kernel: [<ffffffff8165b6aa>] net_rx_action+0x21a/0x350
> kernel: [<ffffffff810a01ab>] __do_softirq+0x10b/0x2b0
> kernel: [<ffffffff810a0565>] irq_exit+0x125/0x130
> kernel: [<ffffffff81778788>] do_IRQ+0x58/0xf0
> kernel: [<ffffffff8177656d>] common_interrupt+0x6d/0x6d