Comment 9 for bug 1712831

There could be two potential changes that caused this regression, looking at [1]:

It either is the newer OVS 2.8 or the Kernel 4.12.
There are two good tests with OVS-2.8 in a row.
2017-08-10 16:37:12 UTC
2017-08-14 11:20:32 UTC

Given the current rate of success (5/24) it is rather unlikely that this case had the issue present.
Then on "Published on 2017-08-16" we got kernel 4.12 [2] and since then the issues occur.

So no hard guarantee, but all data points to 4.12 to be the regressing change.

[1]: http://autopkgtest.ubuntu.com/packages/openvswitch/artful/i386
[2]: https://launchpad.net/ubuntu/+source/linux/4.12.0-11.12