=== 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() [0x5038f9]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:108

 1: ./Castro3d.gnu.TEST.MPI.ex() [0x5044b9]
    amrex::BLBackTrace::handler(int)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:55

 2: ./Castro3d.gnu.TEST.MPI.ex() [0x41cee1]
    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:3603

 3: ./Castro3d.gnu.TEST.MPI.ex() [0x42920b]
    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:322

 4: ./Castro3d.gnu.TEST.MPI.ex() [0x429542]
    Castro::subcycle_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:1238

 5: ./Castro3d.gnu.TEST.MPI.ex() [0x42b71a]
    Castro::advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:103

 6: ./Castro3d.gnu.TEST.MPI.ex() [0x5503c5]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2099

 7: ./Castro3d.gnu.TEST.MPI.ex() [0x5505fd]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2160

 8: ./Castro3d.gnu.TEST.MPI.ex() [0x5505fd]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2160

 9: ./Castro3d.gnu.TEST.MPI.ex() [0x5505fd]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2160

10: ./Castro3d.gnu.TEST.MPI.ex() [0x5456d6]
    amrex::Amr::coarseTimeStep(double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2386

11: ./Castro3d.gnu.TEST.MPI.ex() [0x4174ea]
    main
    /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:133

12: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7febe60e0413]
    ??
    ??:0

13: ./Castro3d.gnu.TEST.MPI.ex() [0x41b33e]
    _start
    ??:?