=== 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() [0x56fb99]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:108

 1: ./Castro2d.gnu.TEST.MPI.ex() [0x570759]
    amrex::BLBackTrace::handler(int)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:55

 2: /lib64/libc.so.6(+0x385c0) [0x7f4805bd35c0]
    ??
    ??:0

 3: /lib64/libc.so.6(gsignal+0x10f) [0x7f4805bd353f]
    ??
    ??:0

 4: /lib64/libc.so.6(abort+0x127) [0x7f4805bbd895]
    ??
    ??:0

 5: /lib64/libc.so.6(+0x7b927) [0x7f4805c16927]
    ??
    ??:0

 6: /lib64/libc.so.6(+0x8225c) [0x7f4805c1d25c]
    ??
    ??:0

 7: /lib64/libc.so.6(+0x827c4) [0x7f4805c1d7c4]
    ??
    ??:0

 8: ./Castro2d.gnu.TEST.MPI.ex() [0x518071]
    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() [0x655675]
    __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() [0x70d613]
    __ctu_module_MOD_umeth
    /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_nd.F90:1404

11: ./Castro2d.gnu.TEST.MPI.ex() [0x70e7e3]
    ca_ctu_update
    /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_ctu_nd.F90:2601

12: ./Castro2d.gnu.TEST.MPI.ex() [0x45ae0c]
    Castro::construct_hydro_source(double, double)
    /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_hydro.cpp:114

13: ./Castro2d.gnu.TEST.MPI.ex() [0x437e0e]
    Castro::do_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:275

14: ./Castro2d.gnu.TEST.MPI.ex() [0x438252]
    Castro::subcycle_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:1238

15: ./Castro2d.gnu.TEST.MPI.ex() [0x43a9d2]
    Castro::advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:103

16: ./Castro2d.gnu.TEST.MPI.ex() [0x59d415]
    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() [0x592b46]
    amrex::Amr::coarseTimeStep(double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2310

18: ./Castro2d.gnu.TEST.MPI.ex() [0x41e61a]
    main
    /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:133

19: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7f4805bbf413]
    ??
    ??:0

20: ./Castro2d.gnu.TEST.MPI.ex() [0x423d4e]
    _start
    ??:?