=== 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: ./Castro2d.gnu.TEST.MPI.ex(+0x1fcad5) [0x55ae22610ad5]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:167:39

 1: ./Castro2d.gnu.TEST.MPI.ex(+0x1fe953) [0x55ae22612953]
    amrex::BLBackTrace::handler(int)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:71:8

 2: ./Castro2d.gnu.TEST.MPI.ex(+0x34e12) [0x55ae22448e12]
    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: ./Castro2d.gnu.TEST.MPI.ex(+0x4e2eb) [0x55ae224622eb]
    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: ./Castro2d.gnu.TEST.MPI.ex(+0x4f4fe) [0x55ae224634fe]
    Castro::subcycle_advance_ctu(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance_ctu.cpp:574:13

 5: ./Castro2d.gnu.TEST.MPI.ex(+0x46802) [0x55ae2245a802]
    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: ./Castro2d.gnu.TEST.MPI.ex(+0x24bcf0) [0x55ae2265fcf0]
    amrex::Amr::timeStep(int, double, int, int, double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2121:36

 7: ./Castro2d.gnu.TEST.MPI.ex(+0x23ec1d) [0x55ae22652c1d]
    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: ./Castro2d.gnu.TEST.MPI.ex(+0x25b56) [0x55ae22439b56]
    main
/raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:143:33

 9: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7ff2aa20a1a3]
    __libc_start_main
??:0

10: ./Castro2d.gnu.TEST.MPI.ex(+0x2ec6e) [0x55ae22442c6e]
    _start
??:0