I'm sorry, I just noticed that you replied 6 days ago, but I apparently wasn't notified by the Debian bug tracker. :-(
Ok, so this is an MPI_Alltoall issue. Does it use MPI_IN_PLACE? On Wed, 06 Oct 2021 20:15:38 +0200 Drew Parsons <dpars...@debian.org> wrote: > Source: openmpi > Followup-For: Bug #995599 > > Not so simple to make a minimal test case I think. > > all_to_all is defined in cpp/dolfinx/common/MPI.h in dolfinx source, > and calls MPI_Alltoall from openmpi. > > It's designed to use with graph::AdjacencyList<T> from > graph/AdjacencyList.h, and is called from > compute_nonlocal_dual_graph() in mesh/graphbuild.cpp, where T is set > to std::int64_t. > > I tried grabbing dolfinx' all_to_all and use it with a pared down > version of AdjacencyList. But it's not triggering the segfault on an > i386 chroot. Possibly because I haven't populated it with an actual > graph so there's nothing to send with MPI_Alltoall. > > -- Jeff Squyres jsquy...@cisco.com
