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MPICH 5.0.1 / MVAPICH 4.1 (ch4:ucx, UCX InfiniBand rc_mlx5 only): MPI_Accumulate with a large irregular datatype fails — packed datatype exceeds the UCX IB active-message header limit

Status: Open.

#7886 In pmodels/mpich;

· jeffhammond opened on Jul 18, 2026

Sigsegv in in mpidig_rma_callbacks.c for MPI_Get with "MPIR_CVAR_CH4_OFI_ENABLE_RMA=0" and a lot of traffic

aurora

Status: Open.

#7884 In pmodels/mpich;

· colleeneb opened on Jul 17, 2026

Assertion failed in ofi_am_impl.h for MPI_Get with "MPIR_CVAR_CH4_OFI_ENABLE_RMA=0"

aurora

Status: Open.

#7881 In pmodels/mpich;

· colleeneb opened on Jul 15, 2026

AURORA - MPI_THREAD_MULTIPLE - Random hangs encountered?

aurora

Status: Open.

#7880 In pmodels/mpich;

· brianhol42 opened on Jul 15, 2026

Adding GitHub Actions workflows for MPICH build and mpi4py tests

Status: Open.

#7865 In pmodels/mpich;

· dalcinl opened on Jul 3, 2026

ch4/ofi: MPICH hangs when VPN interface is selected by libfabric provider

Status: Open.

#7863 In pmodels/mpich;

· raffenet opened on Jul 1, 2026

MPI_Session fail when running concurently with a MPI program

aurora

Status: Open.

#7852 In pmodels/mpich;

· TApplencourt opened on Jun 24, 2026

Possibly unbounded memory growth in GPU-aware MPI code on Aurora

aurora

Status: Open.

#7849 In pmodels/mpich;

· colleeneb opened on Jun 23, 2026

MPI ABI fix for test/mpi/f77/pt2pt/bsendf.f

Status: Open.

#7846 In pmodels/mpich;

· jeffhammond opened on Jun 19, 2026

MPI Forum ABI wrapper for MPI_Type_create_f90_integer returns success with MPI_DATATYPE_NULL

Status: Open.

#7833 In pmodels/mpich;

· jsquyres opened on Jun 10, 2026

Possible bug due to failing cudaMemcpyAsync

Status: Open.

#7819 In pmodels/mpich;

· nmnobre opened on May 27, 2026

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

Status: Open.

#7805 In pmodels/mpich;

· eellis-mw opened on May 12, 2026