Hi, 
I am writing a basic particle tracking code with an existing periodic DMDA. All 
velocity calculations and position updates work fine but migration throws 
segfault. I have checked and particles are within the periodic box as well. 

I discovered that there is an internal field for coordinates which has to be 
defined using its identifier instead of explicitly registering a field. I am 
not registering any velocity field (using external vectors).

 Is there something I am missing?

Thanks, 
Prateek

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