=== 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: ./Castro2d.gnu.TEST.MPI.ex() [0x517139]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:108

 1: ./Castro2d.gnu.TEST.MPI.ex() [0x518ba3]
    amrex::BLBackTrace::handler(int)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:55

 2: ./Castro2d.gnu.TEST.MPI.ex() [0x411d43]
    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_is_local() const
    /usr/include/c++/7/bits/basic_string.h:211
    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_dispose()
    /usr/include/c++/7/bits/basic_string.h:220
    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()
    /usr/include/c++/7/bits/basic_string.h:647
    Castro::check_for_nan(amrex::MultiFab&, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:3567

 3: ./Castro2d.gnu.TEST.MPI.ex() [0x42170d]
    Castro::do_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:201

 4: ./Castro2d.gnu.TEST.MPI.ex() [0x421e34]
    Castro::subcycle_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:1240

 5: ./Castro2d.gnu.TEST.MPI.ex() [0x42501a]
    Castro::advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:103

 6: ./Castro2d.gnu.TEST.MPI.ex() [0x546868]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:1948

 7: ./Castro2d.gnu.TEST.MPI.ex() [0x54695e]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2005

 8: ./Castro2d.gnu.TEST.MPI.ex() [0x53b1fb]
    amrex::Amr::coarseTimeStep(double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2162

 9: ./Castro2d.gnu.TEST.MPI.ex() [0x408d1a]
    main
    /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:132

10: /lib64/libc.so.6(__libc_start_main+0xea) [0x7fcb4fffbf2a]
    ??
    ??:0

11: ./Castro2d.gnu.TEST.MPI.ex() [0x40dc6a]
    _start
    ??:?