=== 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() [0x550949]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:108

 1: ./Castro2d.gnu.TEST.MPI.ex() [0x551509]
    amrex::BLBackTrace::handler(int)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:55

 2: /lib64/libc.so.6(+0x385c0) [0x7fb7f0c395c0]
    ??
    ??:0

 3: /lib64/libc.so.6(gsignal+0x10f) [0x7fb7f0c3953f]
    ??
    ??:0

 4: /lib64/libc.so.6(abort+0x127) [0x7fb7f0c23895]
    ??
    ??:0

 5: /lib64/libc.so.6(+0x7b927) [0x7fb7f0c7c927]
    ??
    ??:0

 6: /lib64/libc.so.6(+0x8225c) [0x7fb7f0c8325c]
    ??
    ??:0

 7: /lib64/libc.so.6(+0x83a6c) [0x7fb7f0c84a6c]
    ??
    ??:0

 8: ./Castro2d.gnu.TEST.MPI.ex() [0x4f8e21]
    amrex::CArena::free(void*)
    /usr/include/c++/8/bits/stl_tree.h:2494
    ??
    /usr/include/c++/8/bits/stl_tree.h:1129
    ??
    /usr/include/c++/8/bits/stl_set.h:655
    amrex::CArena::free(void*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_CArena.cpp:167

 9: ./Castro2d.gnu.TEST.MPI.ex() [0x5f8005]
    __amrex_mempool_module_MOD_bl_deallocate_r4
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_mempool_mod.F90:463

10: ./Castro2d.gnu.TEST.MPI.ex() [0x697d0c]
    __ctu_module_MOD_umeth
    /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_nd.F90:1404

11: ./Castro2d.gnu.TEST.MPI.ex() [0x698ed3]
    ca_ctu_update
    /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_nd.F90:2601

12: ./Castro2d.gnu.TEST.MPI.ex() [0x450a3c]
    Castro::construct_hydro_source(double, double)
    /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_hydro.cpp:114

13: ./Castro2d.gnu.TEST.MPI.ex() [0x42f84a]
    Castro::do_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:275

14: ./Castro2d.gnu.TEST.MPI.ex() [0x42fbe2]
    Castro::subcycle_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:1238

15: ./Castro2d.gnu.TEST.MPI.ex() [0x43216a]
    Castro::advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:103

16: ./Castro2d.gnu.TEST.MPI.ex() [0x57e1d5]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2058

17: ./Castro2d.gnu.TEST.MPI.ex() [0x573906]
    amrex::Amr::coarseTimeStep(double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2310

18: ./Castro2d.gnu.TEST.MPI.ex() [0x41a97a]
    main
    /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:133

19: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7fb7f0c25413]
    ??
    ??:0

20: ./Castro2d.gnu.TEST.MPI.ex() [0x41f60e]
    _start
    ??:?