Description of problem:



We are running Fedora 20 64 bit.

The guest machines are Windows XP converted from VmWare via VirtualBox to KVM.

We install Fedora, KVM and add the virtual machines and briged network works.

We did a "yum update" perhaps 3 weeks ago and were still fine.

After "yum update" last week the guest machines can no longer be reached from the network.

We have reinstalled and things work again and after update the problems happens again. So it is repeatable.


We think something has changed beween 3 weeks and 1 week ago that break the feature.

It works with kernel version 3.11.10-301.fc20.x86_64.
It still works with  3.14.3-200.fc20.x86_64.
It does not work with kernel version 3.14.4-200.fc20






Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:

This is what we did in more detail.

Standard Fedora from DVD

Add proxy setting in /etc/yum.conf.

yum install openssh-server
systemctl enable sshd.service
systemctl start sshd.service


yum install nano

yum install samba

nano /etc/samba/smb.conf

systemctl enable smb.service
systemctl start smb.service
systemctl enable nmb.service
systemctl start nmb.service




Turn off firewall and selinux

nano /etc/selinux/config
SELINUX=disabled

systemctl stop firewalld.service  
systemctl disable firewalld.service  

reboot 





Install kvm



yum install @virtualization
yum install libvirt


systemctl start libvirtd




Add/Import virtual machines

Copy virtual machine images VirtualDeveloperMachines (VDM) and VitrualTestMachines (VTM)  if they are not already on disk.
VDMs need two network interfraces one bridged an one NAT. VTMs need only NAT.

virt-manager

Create a NAT network atpcutest with a dhcp 192.168.4.101 to 132

Create new machine.
Give path to the image files
type Windows XP
Give VDMs 2 cores and 3096MB memory
Give VTMs 1 core and 1024MB memory
Set configure bofore install
Set start VM at boot
Set Disk driver to virtio
For VDMs add an extra NIC, Set one NIC to bridged em1 set other NIC to atpcutest
For VTMs set NIC to atpcutest
Both NICs as virtio
Set Grapchic as VMVGA

After booting VDMs set their static IPs (both)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

Doing the above work. Also after rebooting.
After doing "yum update" 2014-05-21 it does not work.

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Actual results:


Expected results:


Additional info:

I first reported this here:
https://bugzilla.kernel.org/show_bug.cgi?id=76621

They say its a Fedora or a qemu problem.