Dear DuMuX experts,
Please advise what can cause the following bizarre error: the code compiled with debug options runs smoothly but the same code compiled with release options crashes in the linear solver with the following message: Solve: M deltax^k = rNewton: Caught exception: "SolverAbort [apply:/home/nikolai/dumux/dune-istl/dune/istl/solvers.hh:628]: breakdown in BiCGSTAB - rho 0 <= EPSILON 1e-80 after 87.5 iterations" This error pops up when working on a modified version of the exercise-fractures test cases from dumux-course. Apart from modifying the -problem.hh and -spatialparams.hh files, I have also corrected darcyslaw.hh and switched the formulation to p1s0 (as described in my previous post). Compilation .opts files are attached. May thanks, Nikolai
debug.opts
Description: debug.opts
cmake_O3.opts
Description: cmake_O3.opts
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