=== If no file names and line numbers are shown below, one can run
            addr2line -Cfie my_exefile my_line_address
    to convert `my_line_address` (e.g., 0x4a6b) into file name and line number.

=== 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: ./Castro3d.gnu.TEST.MPI.ex() [0x541c1a]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:105

 1: ./Castro3d.gnu.TEST.MPI.ex() [0x542a58]
    amrex::BLBackTrace::handler(int)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:51

 2: ./Castro3d.gnu.TEST.MPI.ex() [0x416453]
    Castro::check_for_nan(amrex::MultiFab&, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:3429

 3: ./Castro3d.gnu.TEST.MPI.ex() [0x423faa]
    Castro::do_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:326

 4: ./Castro3d.gnu.TEST.MPI.ex() [0x426fb5]
    Castro::advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:108

 5: ./Castro3d.gnu.TEST.MPI.ex() [0x5739a9]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:1953

 6: ./Castro3d.gnu.TEST.MPI.ex() [0x56725b]
    amrex::Amr::coarseTimeStep(double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2063

 7: ./Castro3d.gnu.TEST.MPI.ex() [0x40b21e]
    main
    /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:132

 8: /lib64/libc.so.6(__libc_start_main+0xea) [0x7f23dd7ec00a]
    ??
    ??:0

 9: ./Castro3d.gnu.TEST.MPI.ex() [0x413cba]
    _start
    ??:?