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:
https://svn.open-mpi.org/trac/ompi/ticket/2752
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
>
> Thanks!
>
> dom
>
>
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Jeff Squyres
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