SNESLineSearch CP makes invalid use of atol
If the initial residual is small, we end up converging due to atol
even though no norm of that size is computed. This issue goes away if one switches to -snes_linesearch_type bt
.
0 SNES Function norm 1.500673018756e-10
Linear solve converged due to CONVERGED_RTOL iterations 5
Nonlinear solve converged due to CONVERGED_FNORM_ABS iterations 0