Comment 9 for bug 1620407

I set up an automatic bisecting env and was able to run locally in a way that I can reproduce from the local dir it built. That is still running, so I was moving to a more beefy Server now and feeding some time and electric power into it to see if it can find the upstream fix that resolved it.

By parsing through changes my gut feeling expects:
9c17d665fdc5f "autocreate tap device for ethernet network type"

I'll update what it hopefully found tomorrow.