Thanks for reporting this bug. (Sorry about the delay - I've sat and
thought about this a few times but haven't yet had any definite thoughts
about what would debug this).
Do you have the vhost_net module installed?
I'm pretty sure the bug is in qemu itself, but just to be sure would you
mind testing with a lxc container to see if it has the same problem?
Just
sudo apt-get -y install lxc
cat > lxc.conf.custom << EOF
lxc.network.type=veth
lxc.network.link=br0
lxc.network.flags=up
EOF
sudo lxc-create -t ubuntu -n r1 -f lxc.conf.custom
sudo lxc-start -n r1
then log in as user ubuntu password ubuntu, and see if networking stays
up.
This seems very reminiscent of bug 997978.
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: qemu-kvm (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1153364
Title:
trouble with guest network connectivity when host is using a bonded
interface
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