On Mon, Jul 20, 2020 at 2:36 PM Fande Kong <fdkong...@gmail.com> wrote:

> Hi Mark,
>
> Just to be clear, I do not think it is related to GAMG or PtAP. It is a
> communication issue:
>

Youe stack trace was from PtAP, but Chris's problem is not.


>
> Reran the same code, and I just got :
>
> [252]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [252]PETSC ERROR: Petsc has generated inconsistent data
> [252]PETSC ERROR: Received vector entry 4469094877509280860 out of local
> range [255426072,256718616)]
>

OK, now this (4469094877509280860) is clearly garbage. THat is the
important thing.  I have to think your MPI is buggy.

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