Issues

• Heap buffer overflow in MPI_Comm_set_name(MPI_COMM_WORLD, …) with names longer than 15 characters (5.0.11, macOS arm64)

  open-mpi/ompi#14558 · Filter by author willend opened on Oct 2, 2026
  2

• security policy doc

  open-mpi/ompi#14546 · Filter by author hppritcha opened on Sep 30, 2026

• opal_os_dirpath_create() still follows a symlink when the path has a trailing separator

  open-mpi/ompi#14469 · Filter by author tonyskjellum opened on Sep 20, 2026

• Unwanted debug/verbose output with nVidia card

  open-mpi/ompi#14413 · Filter by author amckinstry opened on Sep 10, 2026
  4

• MPI_T Events: What is considered dereferencing a handle?

  open-mpi/ompi#14410 · Filter by author Matthew-Whitlock opened on Sep 9, 2026
  1

• UCX Memory mismatch in ompi_coll_base_gather_intra_binomial

  open-mpi/ompi#14385 · Filter by author DreamerLuu opened on Sep 3, 2026
  1

• uct BTL busy-spins forever in singleton MPI_Init() on a system with no RDMA hardware (v5.0.10)

  open-mpi/ompi#14383 · Filter by author GitPaean opened on Sep 3, 2026
  

• Problems installing OpenMPI (from ubuntu packages) in Ubuntu 24.04

  open-mpi/ompi#14378 · Filter by author JOSECCZ opened on Sep 2, 2026

• Install MPI ABI into separate prefix

  open-mpi/ompi#14348 · Filter by author eschnett opened on Aug 23, 2026
  7

  

• Unable to build ROMIO in Open MPI v5.0.10 with GCC 15.2.0

  open-mpi/ompi#14342 · Filter by author vterzi opened on Aug 21, 2026

• Performance regression with cuda drivers 580+

  open-mpi/ompi#14337 · Filter by author angainor opened on Aug 20, 2026

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

  open-mpi/ompi#14336 · Filter by author dalcinl opened on Aug 20, 2026
  

• CUDA-aware MPI: inter-node MPI_Irecv into a CUDA IPC-imported device buffer fails

  open-mpi/ompi#14305 · Filter by author hppritcha opened on Aug 10, 2026
  2

  

• Stale plugins allowed to load

  open-mpi/ompi#14299 · Filter by author rhc54 opened on Aug 9, 2026
  

• A fresh window has a name ("rdma window 3")

  open-mpi/ompi#14298 · Filter by author eschnett opened on Aug 9, 2026
  3

  

• ABI: need to add in some plumbing for MPI T event callback object types

  Target: mainTarget: v6.0.x
  open-mpi/ompi#14291 · Filter by author hppritcha opened on Aug 6, 2026
  1

  

• What is the expected timeline for MPI 5.0 / OpenMPI 6 ?

  questionState-Awaiting user informationTarget: v6.0.x
  open-mpi/ompi#14223 · Filter by author amckinstry opened on Jul 29, 2026
  19

• Open MPI osc/rdma over OFI crashes after MPI_Win_allocate with multiple local ranks

  open-mpi/ompi#14203 · Filter by author jeffhammond opened on Jul 23, 2026

• MPI_Accumulate loses updates with a one-element indexed datatype over UCX/InfiniBand

  open-mpi/ompi#14181 · Filter by author jeffhammond opened on Jul 20, 2026

• osc/ucx: MPI_Accumulate with derived datatypes SIGSEGVs (NULL deref in the reduction) on the short-message path

  open-mpi/ompi#14175 · Filter by author jeffhammond opened on Jul 18, 2026

• 4.x bug: MPI_Get_accumulate / MPI_Rget_accumulate with MPI_REPLACE hang across nodes on IB

  open-mpi/ompi#14173 · Filter by author jeffhammond opened on Jul 17, 2026

• --map-by dist not working (anymore) / --map-by device=gpu wanted

  open-mpi/ompi#14169 · Filter by author christgau opened on Jul 14, 2026
  16

• Open MPI program stops to work due to ptrace linux kernel vulnerability CVE-2026-46333

  open-mpi/ompi#14160 · Filter by author jfikar opened on Jul 13, 2026
  2

• A compilation error occurs when Making all in mca/base

  open-mpi/ompi#14153 · Filter by author Jaden-Anderson opened on Jul 12, 2026
  2

• ABI: Performance Concern: ABI Datatype Converter Uses Linear Search in Hot Path

  open-mpi/ompi#14142 · Filter by author hppritcha opened on Jul 9, 2026