Issues

• ULFM: failure queries on an intercommunicator report only the local group

  open-mpi/ompi#14747 · Filter by author rhc54 opened on Oct 30, 2026

• ompi_dpm_dyn_finalize: sides holding different numbers of dynamic communicators hang in MPI_Finalize

  open-mpi/ompi#14746 · Filter by author rhc54 opened on Oct 30, 2026

• Disconnected child job aborts with "Socket closed" when parents exit with MPI_T still initialized

  open-mpi/ompi#14740 · Filter by author Petter-Programs opened on Oct 28, 2026
  4

• part/persist never releases its two MPI_COMM_WORLD duplicates

  bugmemory leakSeverity: criticalTarget: main
  open-mpi/ompi#14726 · Filter by author bosilca opened on Oct 26, 2026

• btl uct + osc/rdma: memory returned to the kernel by glibc (malloc_trim) is read through the old registration on two nodes (silently wrong data), 6.0.0rc2

  open-mpi/ompi#14720 · Filter by author qclo opened on Oct 24, 2026
  2

• osc/ucx: MPI_Accumulate aborts with "rc_verbs ... send completion with error: remote access error" between two nodes (5.0.10 and 6.0.0rc2)

  open-mpi/ompi#14719 · Filter by author qclo opened on Oct 24, 2026

• osc/rdma + btl/uct: MPI_Accumulate updates are lost with 3 or more ranks on one node (MPI_Win_create, pml ob1) — 5.0.10 and 6.0.0rc2

  open-mpi/ompi#14718 · Filter by author qclo opened on Oct 24, 2026

• Request: backport the btl/uct completion-status initialisation (#13032) to v5.0.x

  open-mpi/ompi#14717 · Filter by author qclo opened on Oct 24, 2026
  

• btl/uct: MPI_Sendrecv of more than ~10 MiB between two nodes never completes with MPI_THREAD_MULTIPLE and btl_uct_bind_threads_to_contexts=0 (6.0.0rc2)

  open-mpi/ompi#14716 · Filter by author qclo opened on Oct 24, 2026

• OPAL doesn't close libfabric fabric object when using layered core+hook provider stack

  open-mpi/ompi#14708 · Filter by author philippfriese opened on Oct 23, 2026

• mpicc links with -lopen_mpi

  open-mpi/ompi#14660 · Filter by author dalcinl opened on Oct 19, 2026
  9

  

• How to compile 6.0.0rc2 with NAG without mpi_f08 support?

  open-mpi/ompi#14655 · Filter by author mathomp4 opened on Oct 16, 2026
  3

• Fortran sentinels (MPI_IN_PLACE etc.) in .bss are duplicated into shared libraries that use mpif.h; wrong results under RTLD_DEEPBIND

  open-mpi/ompi#14646 · Filter by author eschnett opened on Oct 14, 2026
  2

• Fortran ABI breakage with OpenMPI 6

  NEWS
  open-mpi/ompi#14605 · Filter by author amckinstry opened on Oct 10, 2026
  1

• flang: make check dies using flang-23

  open-mpi/ompi#14588 · Filter by author hppritcha opened on Oct 7, 2026
  

• 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
  8

  

• 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