Memory Leak in MPI_Get_elements_x

[ax3l]

Background information

What version of Open MPI are you using? (e.g., v1.10.3, v2.1.0, git branch name and hash, etc.)

master as of 352b667

Describe how Open MPI was installed (e.g., from a source/distribution tarball, from a git clone, from an operating system distribution package, etc.)

From source via spack.

Please describe the system on which you are running

• Operating system/version: Debian 9
• Computer hardware: ThinkPad
• Network type: Local

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Details of the problem

The function opal_datatype_compute_ptypes in

ompi/ompi/datatype/ompi_datatype_get_elements.c

Line 52 in 352b667

opal_datatype_compute_ptypes(&datatype->super);

allocates datatypes in

ompi/opal/datatype/opal_datatype_get_count.c

Line 161 in 98afc83

datatype->ptypes = (size_t*)calloc(OPAL_DATATYPE_MAX_SUPPORTED, sizeof(size_t));

that don't seem to be freed.

Seen while running a small MPI-I/O example with HDF5 develop: https://forum.hdfgroup.org/t/hdf5bug-h5fd-mpio-collective-chunking/5279

[ggouaillardet]

@ax3l thanks for the report !

Meanwhile, feel free to manually download and apply the patch at https://github.com/open-mpi/ompi/pull/6292.patch

[ggouaillardet]

The fix has landed into both master and v4.0.x branch, so I am now closing this issue.

[ax3l]

Thanks a lot!