=== 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: ./Castro1d.gnu.TEST.MPI.ex() [0x508b91]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:167:39

 1: ./Castro1d.gnu.TEST.MPI.ex() [0x50a9d9]
    amrex::BLBackTrace::handler(int)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:71:8

 2: /lib64/libc.so.6(+0x38600) [0x7f7f147f2600]
    __restore_rt
??:0

 3: ./Castro1d.gnu.TEST.MPI.ex() [0x657f4a]
    ca_enforce_minimum_density
/raid/testing/castro-gfortran/Castro//Source/hydro/advection_util_nd.F90:45

 4: ./Castro1d.gnu.TEST.MPI.ex() [0x42a085]
    Castro::enforce_min_density(amrex::MultiFab&, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:2926:13

 5: ./Castro1d.gnu.TEST.MPI.ex() [0x42b51c]
    Castro::clean_state(amrex::MultiFab&, double, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:3946:22

 6: ./Castro1d.gnu.TEST.MPI.ex() [0x42c647]
    Castro::post_timestep(int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:1831:16

 7: ./Castro1d.gnu.TEST.MPI.ex() [0x5426d2]
    amrex::Amr::timeStep(int, double, int, int, double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2195:32

 8: ./Castro1d.gnu.TEST.MPI.ex() [0x537d46]
    amrex::Amr::coarseTimeStep(double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2439:13

 9: ./Castro1d.gnu.TEST.MPI.ex() [0x41da42]
    main
/raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:143:33

10: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7f7f147de413]
    __libc_start_main
??:0

11: ./Castro1d.gnu.TEST.MPI.ex() [0x42291e]
    _start
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_ParallelDescriptor.H:48:23