Many thanks for your help, it was not clear to me whether it was opal,
my application or the standard C libs that were causing the segfault. It
is already good news that the problem is not at the level of OpenMPI,
since this would have meant upgrading that library. My first reaction
would be to
Absolutely :) The last few entries on the stack are from OPAL (one of
the Open MPI libraries) that trap the segfault. Everything else
indicates where the segfault happened. What I can tell from this stack
trace is the following: the problem started in your function
wait_thread which called
