A new stable release of MPICH, 3.4.1, is now available for download. This is the first bug-fix release in the 3.4.x series. This release contains critical fixes for GPU support and addresses a compatibility issue for MPI applications that use jansson (https://digip.org/jansson/) for manipulating JSON data. You can find the release on our downloads page (https://www.mpich.org/downloads/). Production environments are encouraged to upgrade to this release. Regards, The MPICH team =============================================================================== Changes in 3.4.1 =============================================================================== # Fix bug in GPU memory hooks that caused failures with NCCL # Fix bug in GPU-aware nonblocking op collectives # Hide symbols from embedded json-c module # Removed anonymous struct/union usage in MPL # Disable Java support in embedded UCX module A full list of changes is available at the following link: https://github.com/pmodels/mpich/compare/v3.4...v3.4.1