Issues

• Ibcast circ_graph: payload mismatches after MPI_Wait in a CSEL-redesign-based build

  pmodels/mpich#8026 · Filter by author qktttt opened on Oct 15, 2026

• Fortran sentinels (MPI_IN_PLACE etc.) are in .bss in libmpifort.so, so shared libraries using mpif.h get private copies

  pmodels/mpich#8020 · Filter by author eschnett opened on Oct 14, 2026
  3

• PMix double-free issue

  pmodels/mpich#8019 · Filter by author rbberger opened on Oct 14, 2026
  9

• MPICH behavior changed when MPI_Comm_rank called *before* MPI_Init() - Aurora

  aurora
  pmodels/mpich#8014 · Filter by author brianhol42 opened on Oct 13, 2026
  10

• MPI_Status is not populated in MPI_Isendrecv

  pmodels/mpich#8005 · Filter by author peatman opened on Oct 12, 2026
  2

• ad_lustre: a single failed write deadlocks MPI_File_write_all on all ranks

  pmodels/mpich#7993 · Filter by author sihara opened on Oct 5, 2026
  1

• Fatal error in internal_Allreduce

  aurora
  pmodels/mpich#7983 · Filter by author jkwack opened on Sep 24, 2026
  3

• mpi.h does not define MPI_Fint by default — is this intended and what should packages do?

  pmodels/mpich#7973 · Filter by author ericch1 opened on Sep 16, 2026
  2

• PMI Issue

  pmodels/mpich#7957 · Filter by author aruhela opened on Sep 8, 2026
  9

• ABI: Comments after running libabigail against the MPI ABI stubs

  pmodels/mpich#7938 · Filter by author dalcinl opened on Aug 20, 2026

• MPI_File_write_all / read_all collective buffering does not scale for 4D block-decomposed subarray views (Lustre): 6x slower than a user-level MPI_Alltoallv + POSIX transposition

  pmodels/mpich#7935 · Filter by author paboyle opened on Aug 13, 2026
  5

• Fortran 2008 strided subarrays are passed with the wrong layout

  pmodels/mpich#7932 · Filter by author eschnett opened on Aug 11, 2026

• MPICH Fortran test greqf uses extrastate wrong

  pmodels/mpich#7922 · Filter by author eschnett opened on Aug 4, 2026
  8

• A common abstraction layer for MPI

  pmodels/mpich#7920 · Filter by author LecrisUT opened on Aug 3, 2026
  5

• More error checking in MPI_Neighbour_* functions?

  pmodels/mpich#7899 · Filter by author eschnett opened on Jul 23, 2026
  2

• Feature request: Adding a CVAR to better support oversubscription

  pmodels/mpich#7894 · Filter by author dalcinl opened on Jul 22, 2026

• AURORA - MPI_THREAD_MULTIPLE - Random hangs encountered?

  aurora
  pmodels/mpich#7880 · Filter by author brianhol42 opened on Jul 15, 2026
  8

• MPI_Session fail when running concurently with a MPI program

  aurora
  pmodels/mpich#7852 · Filter by author TApplencourt opened on Jun 24, 2026
  2

• MPI_Comm_connect/accept for singleton init processes broken in MPICH v5.0.1

  pmodels/mpich#7805 · Filter by author eellis-mw opened on May 12, 2026
  2

• Getting GPU IPC to work with HIP/ROCm

  pmodels/mpich#7779 · Filter by author mszpindler opened on Apr 21, 2026
  7

• RC tarballs and shared library versioning

  pmodels/mpich#7765 · Filter by author dalcinl opened on Apr 8, 2026
  2

• abi: MPICH does not provide the Fortran ABI library and compile wrapper

  pmodels/mpich#7759 · Filter by author raffenet opened on Apr 1, 2026
  5

  

• Single MPI all_reduce 50x slower than oneccl

  aurora
  pmodels/mpich#7752 · Filter by author TApplencourt opened on Mar 20, 2026

• ULFM on Polaris with CUDA at 128 nodes

  pmodels/mpich#7744 · Filter by author alvin-zyl opened on Mar 9, 2026

• Poor shared memory performance with small message sizes on Frontier

  pmodels/mpich#7723 · Filter by author AcerP-py opened on Feb 11, 2026
  2