A new stable release of MPICH, 3.4.3, is now available for download. This is the third bug-fix release in the 3.4.x series. This release contains fixes for Hydra, GPU support, ROMIO, datatypes, and other user-reported bugs and build issues. The full set of changes since 3.4.2 can be found here: https://github.com/pmodels/mpich/compare/v3.4.2…v3.4.3
Production environments are encouraged to upgrade to this release.