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[Anders Logg <logg@xxxxxxxxx>]

Fixed now. The above code now gives

RuntimeError: *** Error: Unable to solve linear system; matrix dimension
(18 columns) does not match dimension of solution vector (9).


** Changed in: dolfin
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/732543

Title:
  No error when attempting to solve using wrong dimensions

Status in DOLFIN:
  Fix Committed

Bug description:
  Calling solve with a vector of non-matching dimensions does not
  produce an error. Something mysterious happens instead. Reproduce with
  below code.

  from dolfin import *

  mesh = UnitSquare(2, 2)

  V = FunctionSpace(mesh, "CG", 1)
  Q = FunctionSpace(mesh, "CG", 1)
  W = V * Q

  y = TrialFunction(W)
  w = TestFunction(W)

  a = inner(y, w)*dx
  L = w[0]*dx

  A = assemble(a)
  b = assemble(L)
  y = Function(W)

  info(A)
  info(b)
  u = Function(V)
  info(u.vector())
  solve(A, u.vector(), b)
  info(u.vector())