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config-cache broken on at least main and v6.0.x

backport: v6.0.x

bug

Severity: critical

Target: main

Status: Open.

#14200 In open-mpi/ompi;

· bwbarrett opened on Jul 22, 2026

·  

v6.0.0

MPI_Rput aborts at 255 outstanding requests with Open MPI 5 and UCX

Status: Open.

#14192 In open-mpi/ompi;

· jeffhammond opened on Jul 21, 2026

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

Status: Open.

#14181 In open-mpi/ompi;

· jeffhammond opened on Jul 20, 2026

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

Status: Open.

#14175 In open-mpi/ompi;

· jeffhammond opened on Jul 18, 2026

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

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