SIGSEGV signal (forbidden memory area access) intercepted!

Call stack:
   1: 0x7f0fcbb22aa3 <+0x360aa3>                      (libsaturne.so.5)
   2: 0x7f0fcbb21dba <cs_matrix_set_coefficients+0xea> (libsaturne.so.5)
   3: 0x7f0fcbb15ce7 <cs_grid_coarsen+0x7f7>          (libsaturne.so.5)
   4: 0x7f0fcbb44ca6 <cs_multigrid_setup_conv_diff+0x3e6> (libsaturne.so.5)
   5: 0x7f0fcbb45ee1 <+0x383ee1>                      (libsaturne.so.5)
   6: 0x7f0fcbb51fa0 <+0x38ffa0>                      (libsaturne.so.5)
   7: 0x7f0fcbb59474 <cs_sles_it_solve+0xf64>         (libsaturne.so.5)
   8: 0x7f0fcbb4be18 <cs_sles_solve+0x278>            (libsaturne.so.5)
   9: 0x7f0fcbed4f08 <__cs_c_bindings_MOD_sles_solve_native+0x1ed> (libsaturne.so.5)
  10: 0x7f0fcb9bd332 <resopv_+0x70b2>                 (libsaturne.so.5)
  11: 0x7f0fcb9a13c0 <navstv_+0x3ffc>                 (libsaturne.so.5)
  12: 0x7f0fcb9ce711 <tridim_+0x4a31>                 (libsaturne.so.5)
  13: 0x7f0fcb865ab4 <caltri_+0x1e94>                 (libsaturne.so.5)
  14: 0x7f0fcb837c2a <cs_run+0x55a>                   (libsaturne.so.5)
  15: 0x7f0fcb837da5 <main+0x135>                     (libsaturne.so.5)
  16: 0x7f0fc9800b45 <__libc_start_main+0xf5>         (libc.so.6)
  17: 0x400959     <>                               (cs_solver)
End of stack

