=== 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() [0x5197a1]
    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() [0x51b5e9]
    amrex::BLBackTrace::handler(int)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:71:8

 2: ./Castro2d.gnu.TEST.MPI.ex() [0x423b5c]
    Castro::read_params()
/raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:400:21

 3: ./Castro2d.gnu.TEST.MPI.ex() [0x436dcb]
    Castro::variableSetUp()
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_setup.cpp:161:14

 4: ./Castro2d.gnu.TEST.MPI.ex() [0x55c994]
    amrex::Amr::InitAmr()
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:274:28

 5: ./Castro2d.gnu.TEST.MPI.ex() [0x55e8be]
    amrex::Amr::Amr()
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:240:1

 6: ./Castro2d.gnu.TEST.MPI.ex() [0x41a395]
    main
/raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:122:17

 7: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7fdbf646e413]
    __libc_start_main
??:0

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