[mpich-devel] segfault calling neighbor collectives in communicator with no topology

[Lisandro Dalcin]

On 2 May 2013 18:58, Dave Goodell <goodell at mcs.anl.gov> wrote:
> Thanks for letting us know.  I've created a ticket to track this and commented on your suggestions there:
>
> https://trac.mpich.org/projects/mpich/ticket/1833#comment:1
>

Thanks. BTW, you are right. This was indeed bad API usage from the
user. All neighbor collectives should check that the communicator is
an INTRAcommunicator with cart|graph|distgraph topology attached and
otherwise generate a proper error (of class MPI_ERR_COMM?)


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Lisandro Dalcin
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