Unexpectedly, we will likely have one more release in the v2.1.x series (because of another bug in the vader BTL/atomic support). We are aiming for January 2019.

The bug fix is in the v2.1.x branch already, and is in the nightly v2.1.x tarballs. We just don't have enough resources to do a v2.1.x release until after Supercomputing.

Hopefully, v2.1.6 then will be the last last last release of the v2.1.x series.