A new release candidate of MPICH, 4.2.0rc2, is now available on our downloads page. This release includes a fix for a critical bug in the CUDA memory hooks discovered in testing by the PETSc team. See CHANGES for all detailed release info.
The full set of git commits since 4.1.2 can be found here: https://www.mpich.org/static/downloads/4.2.0rc2/shortlog
At this stage, only critical bugs will be fixed before the 4.2.0 GA release. Please give it a try and report any issues!
