=== 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.DEBUG.TPROF.MPI.ex() [0x889a0e]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
/raid/testing/castro-gfortran/amrex//Src/Base/AMReX_BLBackTrace.cpp:175:29

 1: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x889542]
    amrex::BLBackTrace::handler(int)
/raid/testing/castro-gfortran/amrex//Src/Base/AMReX_BLBackTrace.cpp:85:15

 2: /lib64/libc.so.6(+0x3da60) [0x7f8c08a52a60]
    __restore_rt
??:0

 3: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x852d44]
    amrex::amrex_avg_fc_to_cc(amrex::Box const&, amrex::Array4<double> const&, amrex::Array4<double const> const&, amrex::Array4<double const> const&, int)
/raid/testing/castro-gfortran/amrex//Src/Base/AMReX_MultiFabUtil_2D_C.H:65:54

 4: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x84ba5b]
    amrex::average_face_to_cellcenter(amrex::MultiFab&, std::array<amrex::MultiFab const*, 2ul> const&, amrex::Geometry const&)
/raid/testing/castro-gfortran/amrex//Src/Base/AMReX_MultiFabUtil.cpp:176:13

 5: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x84b519]
    amrex::average_face_to_cellcenter(amrex::MultiFab&, amrex::Vector<amrex::MultiFab const*, std::allocator<amrex::MultiFab const*> > const&, amrex::Geometry const&)
/raid/testing/castro-gfortran/amrex//Src/Base/AMReX_MultiFabUtil.cpp:116:5

 6: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x66515e]
    Gravity::get_old_grav_vector(int, amrex::MultiFab&, double)
/raid/testing/castro-gfortran/Castro//Source/gravity/Gravity.cpp:884:72

 7: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x68a175]
    Castro::construct_old_gravity(int, int, double)
/raid/testing/castro-gfortran/Castro//Source/gravity/Castro_gravity.cpp:111:33

 8: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x480429]
    Castro::do_advance_ctu(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance_ctu.cpp:125:10

 9: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x481b29]
    Castro::subcycle_advance_ctu(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance_ctu.cpp:645:90

10: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x47e137]
    Castro::advance(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:55:55

11: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x949d52]
    amrex::Amr::timeStep(int, double, int, int, double)
/raid/testing/castro-gfortran/amrex//Src/Amr/AMReX_Amr.cpp:2015:44

12: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x94a564]
    amrex::Amr::coarseTimeStep(double)
/raid/testing/castro-gfortran/amrex//Src/Amr/AMReX_Amr.cpp:2125:26

13: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x49bac9]
    main
/raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:148:5

14: /lib64/libc.so.6(__libc_start_main+0xf2) [0x7f8c08a3d1e2]
    __libc_start_main
??:0

15: ./Castro2d.gnu.DEBUG.TPROF.MPI.ex() [0x40a6fe]
    _start
??:0


===== TinyProfilers ======
main()
Amr::coarseTimeStep()
Amr::timeStep()
Castro::advance()
Castro::subcycle_advance_ctu()
Castro::do_advance_ctu()
Castro::construct_old_gravity()
Gravity::get_old_grav_vector()