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Gilles Gouaillardet c9e4240e70 mpi: retain operation and datatype in non blocking collectives
MPI standard states a user MPI_Op and/or user MPI_Datatype can be free'd
after a call to a non blocking collective and before the non-blocking
collective completes.
Retain user (only) MPI_Op and MPI_Datatype when the non blocking call is
invoked, and set a request callback so they are free'd when the MPI_Request
completes.

Thanks Thomas Ponweiser for reporting this

Fixes open-mpi/ompi#2151
Fixes open-mpi/ompi#1304

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>

(cherry picked from commit open-mpi/ompi@0fe756d416)
2019-07-12 10:27:04 +09:00
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