[mvapich-discuss] Segfault in RMA fetch_and_op with sub communicator

[Mingzhe Li]

Hi Min,

Thank you for your reproducer. Could you let us know which version of MV2
you were using?

Thanks,
Mingzhe

On Wed, Jul 13, 2016 at 6:42 PM, Min Si <msi at anl.gov> wrote:

> Hi,
>
> I have got a segfault error in the attached RMA program. It does following
> two steps:
> 1) Create a sub communicator from MPI_COMM_WORLD which only contains
> processes inter-connected with rank 0. For example, suppose 4 processes in
> comm world (-np 4 -ppn 2),  and rank 0, 1 are on node 0, rank 2, 3 are on
> node 1, then the sub communicator includes rank 0, 2, 3.
> 2) Allocate window on the sub communicator, and perform all to one
> fetch_and_op with flush.
>
> The segfault error is reported at the first fetch_and_op operation. If I
> use only inter-connected processes (e.g., -np 2 -ppn 1) or only
> intra-connected processes (e.g., -np 2 -ppn 2), no error happens.
>
> Could you please help me figure out this issue ? Thanks.
>
> Min
>
>
>
>
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