=== 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() [0x555c69]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:108

 1: ./Castro2d.gnu.TEST.MPI.ex() [0x556829]
    amrex::BLBackTrace::handler(int)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:55

 2: /lib64/libc.so.6(+0x385c0) [0x7f2147b7e5c0]
    ??
    ??:0

 3: ./Castro2d.gnu.TEST.MPI.ex() [0x456e61]
    Castro::construct_hydro_source(double, double)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_FabArray.H:824
    ??
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_FabArray.H:924
    Castro::construct_hydro_source(double, double)
    /raid/testing/castro-gfortran/Castro//Source/hydro/Castro_hydro.cpp:1150

 4: ./Castro2d.gnu.TEST.MPI.ex() [0x430a2a]
    Castro::do_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:272

 5: ./Castro2d.gnu.TEST.MPI.ex() [0x430dc2]
    Castro::subcycle_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:1245

 6: ./Castro2d.gnu.TEST.MPI.ex() [0x43332a]
    Castro::advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:102

 7: ./Castro2d.gnu.TEST.MPI.ex() [0x597f25]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2099

 8: ./Castro2d.gnu.TEST.MPI.ex() [0x58d726]
    amrex::Amr::coarseTimeStep(double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2386

 9: ./Castro2d.gnu.TEST.MPI.ex() [0x41bffa]
    main
    /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:133

10: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7f2147b6a413]
    ??
    ??:0

11: ./Castro2d.gnu.TEST.MPI.ex() [0x420c0e]
    _start
    ??:?