=== 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() [0x4f40e9]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*) at /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:108

 1: ./Castro1d.gnu.TEST.MPI.ex() [0x4f5179]
    amrex::BLBackTrace::handler(int) at /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:55

 2: /lib64/libc.so.6(+0x38600) [0x7f2498a4e600]
    ?? ??:0

 3: ./Castro1d.gnu.TEST.MPI.ex() [0x5c4636]
    __trace_ppm_module_MOD_trace_ppm_temp at /raid/testing/castro-gfortran/Castro//Source/hydro/trace_ppm.F90:1899 (discriminator 3)

 4: ./Castro1d.gnu.TEST.MPI.ex() [0x5c953d]
    __trace_ppm_module_MOD_trace_ppm at /raid/testing/castro-gfortran/Castro//Source/hydro/trace_ppm.F90:144

 5: ./Castro1d.gnu.TEST.MPI.ex() [0x5cb813]
    ctu_ppm_states at /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_nd.F90:235

 6: ./Castro1d.gnu.TEST.MPI.ex() [0x44c370]
    Castro::construct_ctu_hydro_source(double, double) at /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_hydro.cpp:225

 7: ./Castro1d.gnu.TEST.MPI.ex() [0x42e2d2]
    Castro::do_advance_ctu(double, double, int, int) at /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance_ctu.cpp:130

 8: ./Castro1d.gnu.TEST.MPI.ex() [0x42ee90]
    Castro::subcycle_advance_ctu(double, double, int, int) at /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance_ctu.cpp:482

 9: ./Castro1d.gnu.TEST.MPI.ex() [0x42d33a]
    Castro::advance(double, double, int, int) at /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:53

10: ./Castro1d.gnu.TEST.MPI.ex() [0x530855]
    amrex::Amr::timeStep(int, double, int, int, double) at /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2110

11: ./Castro1d.gnu.TEST.MPI.ex() [0x52643b]
    amrex::Amr::coarseTimeStep(double) at /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2437

12: ./Castro1d.gnu.TEST.MPI.ex() [0x417c3a]
    main at /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:133

13: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7f2498a3a413]
    ?? ??:0

14: ./Castro1d.gnu.TEST.MPI.ex() [0x41bdee]
    _start at ??:?