=== 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.DEBUG.MPI.ex() [0x5fc7cc]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:107

 1: ./Castro3d.gnu.DEBUG.MPI.ex() [0x5fc5d4]
    amrex::BLBackTrace::handler(int)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:55

 2: /lib64/libc.so.6(+0x385c0) [0x7f0a5c7865c0]
    ??
    ??:0

 3: ./Castro3d.gnu.DEBUG.MPI.ex() [0xad61e8]
    __ctu_module_MOD_consup
    /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_nd.F90:592

 4: ./Castro3d.gnu.DEBUG.MPI.ex() [0xaf4a7d]
    __ctu_module_MOD_ctu_clean_fluxes
    /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_nd.F90:547

 5: ./Castro3d.gnu.DEBUG.MPI.ex() [0xad4ece]
    ca_ctu_update
    /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_nd.F90:2499 (discriminator 10)

 6: ./Castro3d.gnu.DEBUG.MPI.ex() [0x45da9b]
    Castro::construct_hydro_source(double, double)
    /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_hydro.cpp:114 (discriminator 1)

 7: ./Castro3d.gnu.DEBUG.MPI.ex() [0x42a14d]
    Castro::do_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:274

 8: ./Castro3d.gnu.DEBUG.MPI.ex() [0x42d492]
    Castro::subcycle_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:1238

 9: ./Castro3d.gnu.DEBUG.MPI.ex() [0x429d8a]
    Castro::advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:103

10: ./Castro3d.gnu.DEBUG.MPI.ex() [0x658df1]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2079

11: ./Castro3d.gnu.DEBUG.MPI.ex() [0x659589]
    amrex::Amr::coarseTimeStep(double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2366

12: ./Castro3d.gnu.DEBUG.MPI.ex() [0x4571b3]
    main
    /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:133

13: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7f0a5c772413]
    ??
    ??:0

14: ./Castro3d.gnu.DEBUG.MPI.ex() [0x40b7ee]
    _start
    ??:?