Question #149194 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/149194
Chaffra gave more information on the question:
Some extra information: using uBLAS backend I get
Symbolic factorization of a matrix of size 303 x 303 (UMFPACK).
LU factorization of a matrix of size 303 x 303 (UMFPACK).
UMFPACK problem related to call to numeric
*** Warning: UMFPACK reports that the matrix being solved is singular.
Solving linear system of size 303 x 303 (UMFPACK LU solver).
UMFPACK problem related to call to solve
*** Warning: UMFPACK reports that the matrix being solved is singular.
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