On Thu, Feb 22, 2018 at 01:25:03PM -0500, Leo Famulari wrote:
> Also, there is a data race found in the test suite when bootstrapping
> with GCC 5, so this patch changes the entire Go stack to GCC 6. I'll
> send a report upstream.

Upstream bug report:

https://github.com/golang/go/issues/24046