=== 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() [0x4f9b51]
    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() [0x4fb999]
    amrex::BLBackTrace::handler(int)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:71:8

 2: /lib64/libc.so.6(+0x38600) [0x7f34466f2600]
    __restore_rt
??:0

 3: ./Castro1d.gnu.TEST.MPI.ex() [0x5cdc66]
    __trace_ppm_module_MOD_trace_ppm_temp
/raid/testing/castro-gfortran/Castro//Source/hydro/trace_ppm.F90:1899

 4: ./Castro1d.gnu.TEST.MPI.ex() [0x5d2b2d]
    __trace_ppm_module_MOD_trace_ppm
/raid/testing/castro-gfortran/Castro//Source/hydro/trace_ppm.F90:144

 5: ./Castro1d.gnu.TEST.MPI.ex() [0x5d4a13]
    ctu_ppm_states
/raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_nd.F90:207

 6: ./Castro1d.gnu.TEST.MPI.ex() [0x44ee56]
    Castro::construct_ctu_hydro_source(double, double)
/raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_hydro.cpp:259:23

 7: ./Castro1d.gnu.TEST.MPI.ex() [0x430a32]
    Castro::do_advance_ctu(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance_ctu.cpp:130:28

 8: ./Castro1d.gnu.TEST.MPI.ex() [0x4315f0]
    Castro::subcycle_advance_ctu(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance_ctu.cpp:482:21

 9: ./Castro1d.gnu.TEST.MPI.ex() [0x42f4cb]
    Castro::advance(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:55:55

10: ./Castro1d.gnu.TEST.MPI.ex() [0x536eb5]
    amrex::Amr::timeStep(int, double, int, int, double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2112:44

11: ./Castro1d.gnu.TEST.MPI.ex() [0x52c786]
    amrex::Amr::coarseTimeStep(double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2439:13

12: ./Castro1d.gnu.TEST.MPI.ex() [0x41962a]
    main
/raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:133:33

13: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7f34466de413]
    __libc_start_main
??:0

14: ./Castro1d.gnu.TEST.MPI.ex() [0x41d86e]
    _start
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_ParallelDescriptor.H:48:23