=== If no file names and line numbers are shown below, one can run
            addr2line -Cpfie my_exefile my_line_address
    to convert `my_line_address` (e.g., 0x4a6b) into file name and line number.
    Or one can use amrex/Tools/Backtrace/parse_bt.py.

=== 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: ./Castro1d.gnu.TEST.MPI.ex(+0x12ac35) [0x56413149dc35]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:167:39

 1: ./Castro1d.gnu.TEST.MPI.ex(+0x12cab3) [0x56413149fab3]
    amrex::BLBackTrace::handler(int)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:71:8

 2: ./Castro1d.gnu.TEST.MPI.ex(+0x1a6edf) [0x564131519edf]
    __amrex_error_module_MOD_amrex_error0
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_error_mod.F90:41

 3: ./Castro1d.gnu.TEST.MPI.ex(+0x207807) [0x56413157a807]
    ctu_ppm_states
/raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_nd.F90:207

 4: ./Castro1d.gnu.TEST.MPI.ex(+0x59295) [0x5641313cc295]
    Castro::construct_ctu_hydro_source(double, double)
/raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_hydro.cpp:260:23

 5: ./Castro1d.gnu.TEST.MPI.ex(+0x3949f) [0x5641313ac49f]
    Castro::do_advance_ctu(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance_ctu.cpp:130:28

 6: ./Castro1d.gnu.TEST.MPI.ex(+0x3a540) [0x5641313ad540]
    Castro::subcycle_advance_ctu(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance_ctu.cpp:482:21

 7: ./Castro1d.gnu.TEST.MPI.ex(+0x3870a) [0x5641313ab70a]
    double const& std::min<double>(double const&, double const&) inlined at /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:55:92 in Castro::advance(double, double, int, int)
/usr/include/c++/9/bits/stl_algobase.h:205:14
Castro::advance(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:55:92

 8: ./Castro1d.gnu.TEST.MPI.ex(+0x16c2bd) [0x5641314df2bd]
    amrex::Amr::timeStep(int, double, int, int, double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2121:36

 9: ./Castro1d.gnu.TEST.MPI.ex(+0x15fbfa) [0x5641314d2bfa]
    std::vector<double, std::allocator<double> >::operator[](unsigned long) inlined at /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_Vector.H:32:54 in amrex::Amr::coarseTimeStep(double)
/usr/include/c++/9/bits/stl_vector.h:1042:2
amrex::Vector<double, std::allocator<double> >::operator[](unsigned long)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_Vector.H:32:54
amrex::Amr::coarseTimeStep(double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2439:26

10: ./Castro1d.gnu.TEST.MPI.ex(+0x1ee86) [0x564131391e86]
    main
/raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:143:33

11: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7ffa8206e1a3]
    __libc_start_main
??:0

12: ./Castro1d.gnu.TEST.MPI.ex(+0x234ce) [0x5641313964ce]
    _start
??:0