FV + MPI crashes

Application: GRMHD_FV with current grid as in repository, start with

$ mpirun -np 4 ./ExaHyPE-GRMHD ../GRMHD_FV.exahype

and you get

assertion in file /media/storage/numrel/exahype/ExaHyPE-Engine/./ExaHyPE/exahype/mappings/TimeStepSizeComputation.cpp, line 229 failed: solver->getNextMaxCellSize()>0
parameter solver->getNextMaxCellSize(): -1.00000000000000000000e+00
parameter _maxCellSizes[solverNumber]: -1.79769313486231570815e+308
parameter _minCellSizes[solverNumber]:  5.3047       [sveinn],rank:1 info         peano::parallel::SendReceiveBufferAbstractImplementation::releaseSentMessages() sent all messages belonging to node 3 (199 message(s))
 5.30473      [sveinn],rank:1 info         peano::parallel::SendReceiveBufferAbstractImplementation::releaseSentMessages() sent all messages belonging to node 2 (78 message(s))
 5.30475      [sveinn],rank:1 info         peano::parallel::SendReceiveBufferAbstractImplementation::releaseSentMessages() sent all messages belonging to node 0 (42 message(s))
1.79769313486231570815e+308
ExaHyPE-GRMHD: /media/storage/numrel/exahype/ExaHyPE-Engine/./ExaHyPE/exahype/mappings/TimeStepSizeComputation.cpp:229: void exahype::mappings::TimeStepSizeComputation::endIteration(exahype::State&): Assertion `false' failed.

• Voller Log: mpi.log
• Gepackter Coredump: core.gz
• Version information: exa.version (MPI, kein TBB, GCC)