=== 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() [0x556a39]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:108

 1: ./Castro2d.gnu.TEST.MPI.ex() [0x5575f9]
    amrex::BLBackTrace::handler(int)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:55

 2: ./Castro2d.gnu.TEST.MPI.ex() [0x422c71]
    Castro::check_for_nan(amrex::MultiFab&, int)
    /usr/include/c++/8/bits/basic_string.h:211
    ??
    /usr/include/c++/8/bits/basic_string.h:220
    ??
    /usr/include/c++/8/bits/basic_string.h:657
    Castro::check_for_nan(amrex::MultiFab&, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:3624

 3: ./Castro2d.gnu.TEST.MPI.ex() [0x430ac8]
    Castro::do_advance(double, double, int, int)
    /usr/include/c++/8/bits/unique_ptr.h:150
    ??
    /usr/include/c++/8/bits/unique_ptr.h:343
    ??
    /usr/include/c++/8/bits/unique_ptr.h:329
    ??
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_StateData.H:330
    ??
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_AmrLevel.H:320
    Castro::do_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:321

 4: ./Castro2d.gnu.TEST.MPI.ex() [0x430df2]
    Castro::subcycle_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:1244

 5: ./Castro2d.gnu.TEST.MPI.ex() [0x43335a]
    Castro::advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:102

 6: ./Castro2d.gnu.TEST.MPI.ex() [0x598d55]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2099

 7: ./Castro2d.gnu.TEST.MPI.ex() [0x58e4f6]
    amrex::Amr::coarseTimeStep(double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2386

 8: ./Castro2d.gnu.TEST.MPI.ex() [0x41bffa]
    main
    /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:133

 9: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7fb7131e4413]
    ??
    ??:0

10: ./Castro2d.gnu.TEST.MPI.ex() [0x420c0e]
    _start
    ??:?