SEGFAULT on repeated MPI_Comm_connect|MPI_Comm_accept/MPI_Comm_disconnect

[menno]

A simulation package I'm working on uses repeated communications between participants by connecting, sending data, then disconnecting. This is not something I can change.

When I run this on Intel MPI (I tried versions 2020 Update 1 and 2), this gives a segmentation fault after several connect/send/disconnect cycles. The exact number varies from several tens to a few thousand.

I have created a simple reproduction program (see attached).

This works fine if I use OpenMPI 4.0.2 compiled with GCC 8.3.0 and compile the program with the mpicc from OpenMPI, but segfaults with Intel compiler and MPI.

It would be nice if this can be corroborated. And if so, how to solve the problem.

[Gennady_F_Intel · Accepted solution]

Menno,

I see your example makes the MPI calls only, therefore I would recommend you to ask this question to the MPI forum instead of MKL ones.

[menno]

If you can redirect me to the MPI forum? I couldn't find any MPI-specific fora in the forum lists, and I saw other MPI-related questions being asked here, so I posted here. I'd be happy to use a more suitable forum.

Found it.

[menno]

Re-posted to correct category https://community.intel.com/t5/Intel-oneAPI-HPC-Toolkit/SEGFAULT-on-repeated-MPI-Comm-connect-MPI-Comm-accept-MPI-Comm/m-p/1291702/highlight/true#M8479

[MRajesh_intel]

Hi,

Thanks for posting your query. We are closing this thread as you have moved the thread to another forum. We will no longer respond to this thread and if you require any additional assistance from Intel, please start a new thread.

Any further interaction in this thread will be considered community only.

Have a Good day.

Regards

Rajesh.