[mpich-discuss] Hanging behavior with derived types in a 'user-defined gatherv'

[Latham, Robert J.]

On Fri, 2017-04-21 at 15:26 -0700, Jeff Hammond wrote:
> MPIR_CVAR_NOLOCAL=1.

OK, thanks Jeff that was indeed the difference.

I can confirm that with NOLOCAL, some processes are stuck in BARRIER
while one process is stuck in MPI_Waitsome

valgrind doesn't give any help here.  

I hope someone more familiar with the collectives can suggest a fix. 
For now, I've triaged this in issue #2609


https://github.com/pmodels/mpich/issues/2609

==rob
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