Attached is the simplest code that shows problem for me on mac osx 10.13.3 + mpich

Ran in debug mode

without renumbering: runs fine

with cuthill_mckee renumbering 

$ mpirun -np 2 ./step-40

===================================================================================
=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
=   PID 4712 RUNNING AT Praveens-MacBook-Pro.local
=   EXIT CODE: 6
=   CLEANING UP REMAINING PROCESSES
=   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
===================================================================================
YOUR APPLICATION TERMINATED WITH THE EXIT STRING: Abort trap: 6 (signal 6)
This typically refers to a problem with your application.
Please see the FAQ page for debugging suggestions

So the problem seems to occur inside renumbering itself.

Best
praveen

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Attachment: step-40.cc
Description: Binary data

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