=== If no file names and line numbers are shown below, one can run
            addr2line -Cfie my_exefile my_line_address
    to convert `my_line_address` (e.g., 0x4a6b) into file name and line number.

=== Please note that the line number reported by addr2line may not be accurate.
    One can use
            readelf -wl my_exefile | grep my_line_address'
    to find out the offset for that line.

 0: ./Castro2d.gnu.DEBUG.MPI.ex() [0x5b1f22]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:103

 1: ./Castro2d.gnu.DEBUG.MPI.ex() [0x5b1d86]
    amrex::BLBackTrace::handler(int)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:51

 2: ./Castro2d.gnu.DEBUG.MPI.ex() [0x5141fe]
    amrex::ParallelDescriptor::Abort(int, bool)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_ParallelDescriptor.cpp:225

 3: ./Castro2d.gnu.DEBUG.MPI.ex() [0x4db194]
    amrex::Error(char const*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX.cpp:127

 4: ./Castro2d.gnu.DEBUG.MPI.ex() [0x4db3d4]
    bl_error_cpp_
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX.cpp:172

 5: ./Castro2d.gnu.DEBUG.MPI.ex() [0xa3ba24]
    bl_error_
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBoxLib_F.F90:14

 6: ./Castro2d.gnu.DEBUG.MPI.ex() [0xbc215c]
    __advection_util_module_MOD_enforce_minimum_density
    /raid/testing/castro-gfortran/Castro//Source/hydro/advection_util_nd.F90:74

 7: ./Castro2d.gnu.DEBUG.MPI.ex() [0xb43e31]
    ca_enforce_minimum_density
    /raid/testing/castro-gfortran/Castro//Source/driver/castro_c_interfaces_nd.F90:133

 8: ./Castro2d.gnu.DEBUG.MPI.ex() [0x41553a]
    Castro::enforce_min_density(amrex::MultiFab&, amrex::MultiFab&)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:2660 (discriminator 3)

 9: ./Castro2d.gnu.DEBUG.MPI.ex() [0x417f34]
    Castro::clean_state(int, amrex::MultiFab&)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:3583 (discriminator 4)

10: ./Castro2d.gnu.DEBUG.MPI.ex() [0x417e6b]
    Castro::clean_state(int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:3570

11: ./Castro2d.gnu.DEBUG.MPI.ex() [0x417818]
    Castro::expand_state(amrex::MultiFab&, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:3455

12: ./Castro2d.gnu.DEBUG.MPI.ex() [0x426173]
    Castro::initialize_do_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:654

13: ./Castro2d.gnu.DEBUG.MPI.ex() [0x424c6c]
    Castro::do_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:202

14: ./Castro2d.gnu.DEBUG.MPI.ex() [0x424a1b]
    Castro::advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:109

15: ./Castro2d.gnu.DEBUG.MPI.ex() [0x5dd24d]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:1926

16: ./Castro2d.gnu.DEBUG.MPI.ex() [0x5dda3e]
    amrex::Amr::coarseTimeStep(double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2036

17: ./Castro2d.gnu.DEBUG.MPI.ex() [0x445075]
    main
    /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:132

18: /lib64/libc.so.6(__libc_start_main+0xea) [0x7f8e17037f2a]
    ??
    ??:0

19: ./Castro2d.gnu.DEBUG.MPI.ex() [0x40bb9a]
    _start
    ??:?