=== 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.OMP.ex() [0x5940c6]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:104

 1: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x593f19]
    amrex::BLBackTrace::handler(int)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:51

 2: /lib64/libc.so.6(+0x376f0) [0x7f9e7e7656f0]
    ??
    ??:0

 3: /lib64/libc.so.6(gsignal+0xcb) [0x7f9e7e76566b]
    ??
    ??:0

 4: /lib64/libc.so.6(abort+0x141) [0x7f9e7e767381]
    ??
    ??:0

 5: /lib64/libgcc_s.so.1(+0x340d) [0x7f9e7ed3340d]
    ??
    ??:0

 6: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x159b48a]
    set_problem_tags
    /raid/testing/castro-gfortran/Castro//Exec/science/wdmerger/problem_tagging_nd.F90:10

 7: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x42e333]
    Castro::apply_problem_tags(amrex::TagBoxArray&, int, int, double) [clone ._omp_fn.8]
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:2775 (discriminator 2)

 8: /lib64/libgomp.so.1(GOMP_parallel+0x3f) [0x7f9e7ef54cdf]
    ??
    ??:0

 9: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x429c5e]
    Castro::apply_problem_tags(amrex::TagBoxArray&, int, int, double)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:2795

10: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x429b0e]
    Castro::errorEst(amrex::TagBoxArray&, int, int, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:2733

11: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x5c43a1]
    amrex::Amr::ErrorEst(int, amrex::TagBoxArray&, double, int)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2812

12: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x5b473f]
    amrex::AmrMesh::MakeNewGrids(int, double, int&, amrex::Vector<amrex::BoxArray, std::allocator<amrex::BoxArray> >&)
    /raid/testing/castro-gfortran/AMReX//Src/AmrCore/AMReX_AmrMesh.cpp:523

13: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x5c4199]
    amrex::Amr::grid_places(int, double, int&, amrex::Vector<amrex::BoxArray, std::allocator<amrex::BoxArray> >&)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2793

14: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x5c1b5d]
    amrex::Amr::regrid(int, double, bool)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2367

15: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x5bfa96]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:1893

16: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x5c07be]
    amrex::Amr::coarseTimeStep(double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2063

17: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x455339]
    main
    /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:132

18: /lib64/libc.so.6(__libc_start_main+0xea) [0x7f9e7e74f00a]
    ??
    ??:0

19: ./Castro3d.gnu.DEBUG.MPI.OMP.ex() [0x40b73a]
    _start
    ??:?