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

[Sewall, Jason]

> From: Latham, Robert J. [mailto:robl at mcs.anl.gov]
> Sent: Monday, April 24, 2017 3:35 PM

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

Dear Robert,

That barrier is likely a subordinate call inside the top-level Bcast, no? I don't have any Barriers in the code, as I recall. 

The Waitsome issue is indeed what I saw with my printf debugging, although it really only clarified the symptom.
 
> 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

Let me know if there is something else I can do to help here. 

Cheers,
Jason

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