=== 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.TEST.MPI.TRUESDC.ex(+0x18a945) [0x5629ef184945]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:167:39

 1: ./Castro2d.gnu.TEST.MPI.TRUESDC.ex(+0x18c7c3) [0x5629ef1867c3]
    amrex::BLBackTrace::handler(int)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:71:8

 2: ./Castro2d.gnu.TEST.MPI.TRUESDC.ex(+0x49c5c) [0x5629ef043c5c]
    Castro::advance(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:73:21

 3: ./Castro2d.gnu.TEST.MPI.TRUESDC.ex(+0x1d7cc4) [0x5629ef1d1cc4]
    amrex::Amr::timeStep(int, double, int, int, double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2121:36

 4: ./Castro2d.gnu.TEST.MPI.TRUESDC.ex(+0x1cb3da) [0x5629ef1c53da]
    std::vector<double, std::allocator<double> >::operator[](unsigned long) inlined at /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_Vector.H:33:54 in amrex::Amr::coarseTimeStep(double)
/usr/include/c++/9/bits/stl_vector.h:1042:2
amrex::Vector<double, std::allocator<double> >::operator[](unsigned long)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_Vector.H:33:54
amrex::Amr::coarseTimeStep(double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2439:26

 5: ./Castro2d.gnu.TEST.MPI.TRUESDC.ex(+0x27d56) [0x5629ef021d56]
    main
/raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:152:33

 6: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7efdc911d1a3]
    __libc_start_main
??:0

 7: ./Castro2d.gnu.TEST.MPI.TRUESDC.ex(+0x2d12e) [0x5629ef02712e]
    _start
??:0