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Public bug reported:

Neumman boundary conditions (exterior facet integrals) don't seem to be
working in parallel. To reproduce this error, go to test/system
/parallel-assembly-solve/ and run

  mpirun -n 2 python solver.py

I get the following output:

(unitsquare.xml.gz, 1):	*** ERROR (norm = 25.19288137326567, reference = 9.547454087327344, diff = 15.64542728593833)
(unitsquare.xml.gz, 2):	OK (norm = 18.42366670418566, reference = 18.42366670418527, diff = 3.872457909892546e-13)
(unitsquare.xml.gz, 3):	OK (norm = 27.29583104741751, reference = 27.29583104741712, diff = 3.907985046680551e-13)
(unitsquare.xml.gz, 4):	OK (norm = 36.16867128090711, reference = 36.1686712809094, diff = 2.295053036505124e-12)
(unitcube.xml.gz, 1):	*** ERROR (norm = 14.62062082718494, reference = 8.876490653853809, diff = 5.744130173331129)
(unitcube.xml.gz, 2):	*** ERROR (norm = 32.93811914105483, reference = 19.99081167299566, diff = 12.94730746805917)
(unitcube.xml.gz, 3):	OK (norm = 33.85477561286864, reference = 33.85477561286852, diff = 1.20792265079217e-13)
(unitcube.xml.gz, 4):	OK (norm = 49.97357666762994, reference = 49.97357666762962, diff = 3.197442310920451e-13)

Strangely enough, it works for q = 2, 3, 4 in 2D but not q = 1, and
works for q = 3, 4 in 3D but not q = 1, 2.

** Affects: dolfin
     Importance: High
         Status: New

** Changed in: dolfin
   Importance: Undecided => High

** Changed in: dolfin
    Milestone: None => 0.93

-- 
Neumann boundary conditions not working in parallel
https://bugs.launchpad.net/bugs/426473
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Status in DOLFIN: New

Bug description:
Neumman boundary conditions (exterior facet integrals) don't seem to be working in parallel. To reproduce this error, go to test/system/parallel-assembly-solve/ and run

  mpirun -n 2 python solver.py

I get the following output:

(unitsquare.xml.gz, 1):	*** ERROR (norm = 25.19288137326567, reference = 9.547454087327344, diff = 15.64542728593833)
(unitsquare.xml.gz, 2):	OK (norm = 18.42366670418566, reference = 18.42366670418527, diff = 3.872457909892546e-13)
(unitsquare.xml.gz, 3):	OK (norm = 27.29583104741751, reference = 27.29583104741712, diff = 3.907985046680551e-13)
(unitsquare.xml.gz, 4):	OK (norm = 36.16867128090711, reference = 36.1686712809094, diff = 2.295053036505124e-12)
(unitcube.xml.gz, 1):	*** ERROR (norm = 14.62062082718494, reference = 8.876490653853809, diff = 5.744130173331129)
(unitcube.xml.gz, 2):	*** ERROR (norm = 32.93811914105483, reference = 19.99081167299566, diff = 12.94730746805917)
(unitcube.xml.gz, 3):	OK (norm = 33.85477561286864, reference = 33.85477561286852, diff = 1.20792265079217e-13)
(unitcube.xml.gz, 4):	OK (norm = 49.97357666762994, reference = 49.97357666762962, diff = 3.197442310920451e-13)

Strangely enough, it works for q = 2, 3, 4 in 2D but not q = 1, and works for q = 3, 4 in 3D but not q = 1, 2.