=== If no file names and line numbers are shown below, one can run
            addr2line -Cpfie my_exefile my_line_address
    to convert `my_line_address` (e.g., 0x4a6b) into file name and line number.
    Or one can use amrex/Tools/Backtrace/parse_bt.py.

=== 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(+0x204695) [0x55648d30a695]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:167:39

 1: ./Castro3d.gnu.TEST.MPI.ex(+0x206513) [0x55648d30c513]
    amrex::BLBackTrace::handler(int)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:71:8

 2: ./Castro3d.gnu.TEST.MPI.ex(+0x34ee2) [0x55648d13aee2]
    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_is_local() const inlined at /usr/include/c++/9/bits/basic_string.h:231:6 in Castro::check_for_nan(amrex::MultiFab&, int)
/usr/include/c++/9/bits/basic_string.h:222:26
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_dispose()
/usr/include/c++/9/bits/basic_string.h:231:6
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()
/usr/include/c++/9/bits/basic_string.h:658:9
Castro::check_for_nan(amrex::MultiFab&, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:3782:154

 3: ./Castro3d.gnu.TEST.MPI.ex(+0x4dc28) [0x55648d153c28]
    std::vector<amrex::StateData, std::allocator<amrex::StateData> >::operator[](unsigned long) inlined at /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_Vector.H:33:54 in Castro::do_advance_ctu(double, double, int, int)
/usr/include/c++/9/bits/stl_vector.h:1042:2
amrex::Vector<amrex::StateData, std::allocator<amrex::StateData> >::operator[](unsigned long)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_Vector.H:33:54
amrex::AmrLevel::get_new_data(int)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_AmrLevel.H:320:79
Castro::do_advance_ctu(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance_ctu.cpp:196:52

 4: ./Castro3d.gnu.TEST.MPI.ex(+0x4eb3e) [0x55648d154b3e]
    Castro::subcycle_advance_ctu(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance_ctu.cpp:574:13

 5: ./Castro3d.gnu.TEST.MPI.ex(+0x458b2) [0x55648d14b8b2]
    double const& std::min<double>(double const&, double const&) inlined at /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:55:92 in Castro::advance(double, double, int, int)
/usr/include/c++/9/bits/stl_algobase.h:205:14
Castro::advance(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:55:92

 6: ./Castro3d.gnu.TEST.MPI.ex(+0x260134) [0x55648d366134]
    amrex::Amr::timeStep(int, double, int, int, double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2112:81

 7: ./Castro3d.gnu.TEST.MPI.ex(+0x252eed) [0x55648d358eed]
    std::vector<double, std::allocator<double> >::operator[](unsigned long) inlined at /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_Vector.H:33:54 in amrex::Amr::coarseTimeStep(double)
/usr/include/c++/9/bits/stl_vector.h:1042:2
amrex::Vector<double, std::allocator<double> >::operator[](unsigned long)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_Vector.H:33:54
amrex::Amr::coarseTimeStep(double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2439:26

 8: ./Castro3d.gnu.TEST.MPI.ex(+0x25d36) [0x55648d12bd36]
    main
/raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:143:33

 9: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7f28d6b601a3]
    __libc_start_main
??:0

10: ./Castro3d.gnu.TEST.MPI.ex(+0x2ee7e) [0x55648d134e7e]
    _start
??:0