[openstack-dev] [nova] [os-vif] [neutron] Race in setting up linux bridge

Armando M. armamig at gmail.com
Fri Aug 26 21:23:28 UTC 2016


Folks,

Today I spotted [1]. It turns out Neutron and Nova might be racing trying
to set up the bridge to provide VM with connectivity/dhcp. In the observed
failure mode, os-vif fails in [2].

I suppose we might need to protect the bridge creation and make it handle
the potential exception. We would need a similar fix for Neutron in [3].

That said, knowing there is a looming deadline [4], I'd invite folks to
keep an eye on the bug.

Many thanks,
Armando

[1] https://bugs.launchpad.net/neutron/+bug/1617447
[2]
https://github.com/openstack/os-vif/blob/master/vif_plug_linux_bridge/linux_net.py#L125
[3]
http://git.openstack.org/cgit/openstack/neutron/tree/neutron/agent/linux/bridge_lib.py#n58
[4]
http://lists.openstack.org/pipermail/openstack-dev/2016-August/102339.html
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