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

[Min Si]

Hi Mingzhe,

Thanks for handling this issue. I am using 2-2.2rc1. And I also find the 
same issue in get_accumulate.

Regards,
Min

On 7/13/16 6:40 PM, Mingzhe Li wrote:
> 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 
> <mailto: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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