On 7/19/19 9:31 AM, 'Maxi Miller' via deal.II User Group wrote:
> Based on the stacktrace the problematic access happens within 
> mg_cell_worker():
 > ...
 > which is guarded by the if-condition.

Then we have a miracle :-) You'll have to check in a debugger how you got into 
this place. If you go up to frame #8 (assemble_multigrid) you should be able 
why the function mg_cell_worker() was called and what the condition is that 
you checked/wanted to check.

BTW, I typically use
   cell->is_locally_owned()
in place of the more complicated condition you use.

Best
  W.

-- 
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Wolfgang Bangerth          email:                 bange...@colostate.edu
                            www: http://www.math.colostate.edu/~bangerth/

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