=== 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.DEBUG.MPI.ex() [0x5fdfae]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:107

 1: ./Castro2d.gnu.DEBUG.MPI.ex() [0x5fddb6]
    amrex::BLBackTrace::handler(int)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:55

 2: ./Castro2d.gnu.DEBUG.MPI.ex() [0x543512]
    amrex::ParallelDescriptor::Abort(int, bool)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_ParallelDescriptor.cpp:224

 3: ./Castro2d.gnu.DEBUG.MPI.ex() [0x5052db]
    amrex::Abort(char const*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX.cpp:263

 4: ./Castro2d.gnu.DEBUG.MPI.ex() [0x417d9f]
    Castro::check_for_nan(amrex::MultiFab&, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:3624

 5: ./Castro2d.gnu.DEBUG.MPI.ex() [0x42a434]
    Castro::do_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:321

 6: ./Castro2d.gnu.DEBUG.MPI.ex() [0x42dc7a]
    Castro::subcycle_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:1244

 7: ./Castro2d.gnu.DEBUG.MPI.ex() [0x429f9c]
    Castro::advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:102

 8: ./Castro2d.gnu.DEBUG.MPI.ex() [0x6500d1]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2099

 9: ./Castro2d.gnu.DEBUG.MPI.ex() [0x650869]
    amrex::Amr::coarseTimeStep(double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2386

10: ./Castro2d.gnu.DEBUG.MPI.ex() [0x456aa5]
    main
    /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:133

11: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7f1f8ac44413]
    ??
    ??:0

12: ./Castro2d.gnu.DEBUG.MPI.ex() [0x40b7ee]
    _start
    ??:?