=== 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: ./Castro2d.gnu.TEST.MPI.ex() [0x519801]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:167:39

 1: ./Castro2d.gnu.TEST.MPI.ex() [0x51b649]
    amrex::BLBackTrace::handler(int)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:71:8

 2: /lib64/libc.so.6(+0x38600) [0x7f729f568600]
    __restore_rt
??:0

 3: ./Castro2d.gnu.TEST.MPI.ex() [0x459810]
    Castro::construct_mol_hydro_source(double, double, amrex::MultiFab&)
/raid/testing/castro-gfortran/Castro//Source/hydro/Castro_mol_hydro.cpp:85:24

 4: ./Castro2d.gnu.TEST.MPI.ex() [0x436261]
    Castro::do_advance_sdc(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance_sdc.cpp:181:5

 5: ./Castro2d.gnu.TEST.MPI.ex() [0x431d7e]
    Castro::advance(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:60:42

 6: ./Castro2d.gnu.TEST.MPI.ex() [0x561e75]
    amrex::Amr::timeStep(int, double, int, int, double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2112:44

 7: ./Castro2d.gnu.TEST.MPI.ex() [0x5571b6]
    amrex::Amr::coarseTimeStep(double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2439:13

 8: ./Castro2d.gnu.TEST.MPI.ex() [0x41a432]
    main
/raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:143:33

 9: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7f729f554413]
    __libc_start_main
??:0

10: ./Castro2d.gnu.TEST.MPI.ex() [0x41e71e]
    _start
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_ParallelDescriptor.H:48:23