topic Bug in Intel MPI when combining MPI_Intercomm_create and an async progress thread in Intel® MPI Library

Bug in Intel MPI when combining MPI_Intercomm_create and an async progress thread

Donners__John — Fri, 02 Jun 2023 08:13:09 GMT

Hello,

The Intel MPI library (version 2021.9.0) fails when creating an intercommunicator with an asynchronous progress thread. I included a test program which shows the following error:

$ I_MPI_ASYNC_PROGRESS=1 mpirun -n 10 ./a.out Abort(204053775) on node 4 (rank 4 in comm 0): Fatal error in PMPI_Intercomm_create: Other MPI error, error stack: PMPI_Intercomm_create(317)...........: MPI_Intercomm_create(comm=0x84000002, local_leader=0, MPI_COMM_WORLD, remote_leader=0, tag=1, newintercomm=0x7fff23cc61e4) failed MPIR_Intercomm_create_impl(49).......: MPID_Intercomm_exchange_map(645).....: MPIDIU_Intercomm_map_bcast_intra(112): MPIR_Bcast_intra_auto(85)............: MPIR_Bcast_intra_binomial(131).......: message sizes do not match across processes in the collective routine: Received 4100 but expected 16

The program runs fine without the asynchronous progress thread.

Note that this does not happen every time and the probability increases with higher number of MPI ranks. Also, the numbers for 'received' and 'expected' both change, so it looks like a race condition.

Re: Bug in Intel MPI when combining MPI_Intercomm_create and an async progress thread

AishwaryaCV_Intel — Wed, 21 Jun 2023 09:23:38 GMT

Hi,

Thank you for posting in intel communities.

We are able to reproduce the issue, we are working on it and will get back to you soon.

Thanks And Regards,

Aishwarya

Re:Bug in Intel MPI when combining MPI_Intercomm_create and an async progress thread

AishwaryaCV_Intel — Mon, 24 Jul 2023 09:50:37 GMT

Hi,

We have informed the development team about the issue , we will inform you once there is any update on the issue.

Thanks And Regards,

Aishwarya

Re: Bug in Intel MPI when combining MPI_Intercomm_create and an async progress thread

VeenaJ_Intel — Fri, 22 Dec 2023 11:06:52 GMT

Hi,

Thank you for your patience. I wanted to inform you that a fix for the issue you've encountered will be in 2021.12 version

Regards,

Veena