I just confirmed that git tag v1.10.4 runs this program without error.
Unfortunately I gave up on git bisection due to the highly nonlinear nature of the github.com/open-mpi/ompi repository and the failure of several commits to even configure. I also recorded this as github issue #2402: https://github.com/open-mpi/ompi/issues/2402 ________________________________ From: devel <devel-boun...@lists.open-mpi.org> on behalf of Ibanez, Daniel Alejandro <daib...@sandia.gov> Sent: Saturday, November 12, 2016 9:40 AM To: devel@lists.open-mpi.org Cc: Roberts, Nathan V; Thomas E. Voth Subject: [EXTERNAL] [OMPI devel] regression: MPI_Neighbor_alltoall with empty graph Hello, I'd like to report a bug with OpenMPI version 2.0.1. Attached to this email is a C program that runs with only one MPI rank, uses MPI_Dist_graph_create to create a graph topology with no communication edges, and then uses MPI_Neighbor_alltoall with that graph topology. This results in an error similar to the following: [Dans-MacBook-Air:52159] *** An error occurred in MPI_Neighbor_alltoall [Dans-MacBook-Air:52159] *** reported by process [2935488513,0] [Dans-MacBook-Air:52159] *** on communicator MPI COMMUNICATOR 3 CREATE FROM 0 [Dans-MacBook-Air:52159] *** MPI_ERR_INTERN: internal error [Dans-MacBook-Air:52159] *** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort, [Dans-MacBook-Air:52159] *** and potentially your MPI job) This symptom is exhibited by OpenMPI at git tag v2.0.1 and git hash a49422f (latest commit to master). Note that MPICH 3.3a1 runs this program without error. I have a report that OpenMPI v1.10.4 also runs this program without error, hence I'm labeling it a regression. I am confirming this now and will try git bisect to find the point of regression.
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