Doing 

MPI_Isend()

followed by a

MPI_Cancel()

fails on my PSM based system with 1.8.4 like this:

n040108:0.1.Cannot cancel send requests (req=0x2b6279787f80)
n040108:0.0.Cannot cancel send requests (req=0x2b3a3dc92f80)
-------------------------------------------------------
Primary job  terminated normally, but 1 process returned
a non-zero exit code.. Per user-direction, the job has been aborted.
-------------------------------------------------------
--------------------------------------------------------------------------
mpirun detected that one or more processes exited with non-zero status,
thus causing
the job to be terminated. The first process to do so was:

  Process name: [[58364,1],1]
  Exit code:    255
--------------------------------------------------------------------------

Is this something PSM actually cannot do or an Open MPI error?

                Adrian

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