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

Status: Open.

#14173 In open-mpi/ompi;

· jeffhammond opened on Jul 17, 2026

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

Status: Open.

#14169 In open-mpi/ompi;

· christgau opened on Jul 14, 2026

oll/han: deadlock in MPI_Intercomm_merge / MPI_Comm_split at multi-node scale

Status: Open.

#14165 In open-mpi/ompi;

· yinliaws opened on Jul 13, 2026

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

Status: Open.

#14160 In open-mpi/ompi;

· jfikar opened on Jul 13, 2026

Partitioned communication fixes on main that were never back-ported to v5.0.x

Target: v5.0.x

Status: Open.

#14157 In open-mpi/ompi;

· jsquyres opened on Jul 12, 2026

A compilation error occurs when Making all in mca/base

Status: Open.

#14153 In open-mpi/ompi;

· Jaden-Anderson opened on Jul 12, 2026

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

Status: Open.

#14142 In open-mpi/ompi;

· hppritcha opened on Jul 9, 2026

MPI Sessions: repeated MPI_Session_init after full finalize deadlocks on macOS (shmem backing-file ENOENT + PMIx fence hang)

Status: Open.

#14125 In open-mpi/ompi;

· jsquyres opened on Jul 5, 2026

Bogus UCX error message

Target: v6.0.x

Status: Open.

#14086 In open-mpi/ompi;

· rhc54 opened on Jun 21, 2026

opal/mca/if: posix_ipv4 ignores if_base_retain_loopback (#if 0 since 2010); loopback enumeration differs across Linux/macOS vs the BSDs

Status: Open.

#14029 In open-mpi/ompi;

· jsquyres opened on Jun 16, 2026

MPI-5.0 standard ABI (Chapter 20)

enhancement

MPI-5.0MPI-5.0 standard conformanceMPI-5.0 standard conformance

Target: main

Status: Open.

#14021 In open-mpi/ompi;

· jsquyres opened on Jun 15, 2026

The MPI_T events interface is inert (symbols present but no mca_base_event framework; no source/event ever registered)

enhancement

MPI-5.0MPI-5.0 standard conformanceMPI-5.0 standard conformance

Target: main

Status: Open.

#14019 In open-mpi/ompi;

· jsquyres opened on Jun 15, 2026