Sorry for the late reply, but many thanks for the bug report and reliable reproducer.
I've confirmed the problem and filed a bug about this:
On Mar 6, 2011, at 6:12 PM, Dominik Goeddeke wrote:
> The attached example code (stripped down from a bigger app) demonstrates a way to trigger a severe crash in all recent ompi releases but not in a bunch of latest MPICH2 releases. The code is minimalistic and boils down to the call
> MPI_Comm_create(MPI_COMM_WORLD, MPI_GROUP_EMPTY, &dummy_comm);
> which isn't supposed to be illegal. Please refer to the (well-documented) code for details on the high-dimensional cross product I tested (on ubuntu 10.04 LTS), a potential workaround (which isn't supposed to be necessary I think) and an exemplary stack trace.
> Instructions: mpicc test.c -Wall -O0 && mpirun -np 2 ./a.out
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