=== 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.ex(+0x1eda05) [0x55d9db7e0a05]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:167:39

 1: ./Castro2d.gnu.TEST.MPI.ex(+0x1ef883) [0x55d9db7e2883]
    amrex::BLBackTrace::handler(int)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:71:8

 2: ./Castro2d.gnu.TEST.MPI.ex(+0x33696f) [0x55d9db92996f]
    __amrex_error_module_MOD_amrex_error0
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_error_mod.F90:41

 3: ./Castro2d.gnu.TEST.MPI.ex(+0x3f1dc2) [0x55d9db9e4dc2]
    hmmat3
/raid/testing/castro-gfortran/Castro//Source/radiation/HABEC_nd.F90:778

 4: ./Castro2d.gnu.TEST.MPI.ex(+0xd2d26) [0x55d9db6c5d26]
    HypreMultiABec::loadMatrix()
/raid/testing/castro-gfortran/Castro//Source/radiation/HypreMultiABec.cpp:1452:19

 5: ./Castro2d.gnu.TEST.MPI.ex(+0xf4a42) [0x55d9db6e7a42]
    RadSolve::levelSolve(int, amrex::MultiFab&, int, amrex::MultiFab&, double)
/raid/testing/castro-gfortran/Castro//Source/radiation/RadSolve.cpp:438:23

 6: ./Castro2d.gnu.TEST.MPI.ex(+0x108208) [0x55d9db6fb208]
    void amrex::FabArray<amrex::FArrayBox>::setVal<amrex::FArrayBox, void>(double) inlined at /raid/testing/castro-gfortran/Castro//Source/radiation/SGRadSolver.cpp:221:23 in Radiation::single_group_update(int, int, int)
/raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_FabArray.H:1612:5
Radiation::single_group_update(int, int, int)
/raid/testing/castro-gfortran/Castro//Source/radiation/SGRadSolver.cpp:221:23

 7: ./Castro2d.gnu.TEST.MPI.ex(+0x11a8c3) [0x55d9db70d8c3]
    Castro::final_radiation_call(amrex::MultiFab&, int, int)
/raid/testing/castro-gfortran/Castro//Source/radiation/Castro_radiation.cpp:53:36

 8: ./Castro2d.gnu.TEST.MPI.ex(+0x4ce98) [0x55d9db63fe98]
    Castro::advance(double, double, int, int)
/raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:111:21

 9: ./Castro2d.gnu.TEST.MPI.ex(+0x23ab34) [0x55d9db82db34]
    amrex::Amr::timeStep(int, double, int, int, double)
/raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2121:36

10: ./Castro2d.gnu.TEST.MPI.ex(+0x22e24a) [0x55d9db82124a]
    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

11: ./Castro2d.gnu.TEST.MPI.ex(+0x2ae16) [0x55d9db61de16]
    main
/raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:152:33

12: /lib64/libc.so.6(__libc_start_main+0xf3) [0x7f0e20b371a3]
    __libc_start_main
??:0

13: ./Castro2d.gnu.TEST.MPI.ex(+0x30b3e) [0x55d9db623b3e]
    _start
??:0