=== 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() [0x544849]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:108

 1: ./Castro2d.gnu.TEST.MPI.ex() [0x545e63]
    amrex::BLBackTrace::handler(int)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_BLBackTrace.cpp:55

 2: /lib64/libc.so.6(+0x346e0) [0x7f68d89a96e0]
    ??
    ??:0

 3: /lib64/libc.so.6(gsignal+0x110) [0x7f68d89a9660]
    ??
    ??:0

 4: /lib64/libc.so.6(abort+0x151) [0x7f68d89aac41]
    ??
    ??:0

 5: /lib64/libc.so.6(+0x76f17) [0x7f68d89ebf17]
    ??
    ??:0

 6: /lib64/libc.so.6(+0x7d21a) [0x7f68d89f221a]
    ??
    ??:0

 7: /lib64/libc.so.6(+0x7ed5c) [0x7f68d89f3d5c]
    ??
    ??:0

 8: ./Castro2d.gnu.TEST.MPI.ex() [0x526123]
    std::_Rb_tree_iterator<std::pair<amrex::FabArrayBase::BDKey const, amrex::FabArrayBase::CPC*> >::operator++()
    /usr/include/c++/7/bits/stl_tree.h:287
    amrex::FabArrayBase::flushCPC(bool) const
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_FabArrayBase.cpp:522

 9: ./Castro2d.gnu.TEST.MPI.ex() [0x52e4ae]
    amrex::FabArrayBase::clearThisBD(bool)
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_FabArrayBase.cpp:1657

10: ./Castro2d.gnu.TEST.MPI.ex() [0x4eca16]
    amrex::FabArray<amrex::FArrayBox>::clear()
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_FabArray.H:857
    amrex::FabArray<amrex::FArrayBox>::~FabArray()
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_FabArray.H:1029

11: ./Castro2d.gnu.TEST.MPI.ex() [0x54cb93]
    amrex::FillPatchTwoLevels(amrex::MultiFab&, double, amrex::Vector<amrex::MultiFab*, std::allocator<amrex::MultiFab*> > const&, amrex::Vector<double, std::allocator<double> > const&, amrex::Vector<amrex::MultiFab*, std::allocator<amrex::MultiFab*> > const&, amrex::Vector<double, std::allocator<double> > const&, int, int, int, amrex::Geometry const&, amrex::Geometry const&, amrex::PhysBCFunctBase&, amrex::PhysBCFunctBase&, amrex::IntVect const&, amrex::Interpolater*, amrex::Vector<amrex::BCRec, std::allocato    r<amrex::BCRec> > const&, amrex::InterpHook const&, amrex::InterpHook const&)
    /raid/testing/castro-gfortran/AMReX//Src/AmrCore/AMReX_FillPatchUtil.cpp:172

12: ./Castro2d.gnu.TEST.MPI.ex() [0x57552c]
    std::vector<double, std::allocator<double> >::~vector()
    /usr/include/c++/7/bits/stl_vector.h:434 (discriminator 4)
    amrex::Vector<double, std::allocator<double> >::~Vector()
    /raid/testing/castro-gfortran/AMReX//Src/Base/AMReX_Vector.H:20 (discriminator 4)
    amrex::FillPatchIterator::FillFromTwoLevels(double, int, int, int, int)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_AmrLevel.cpp:1070 (discriminator 4)

13: ./Castro2d.gnu.TEST.MPI.ex() [0x57cfa2]
    amrex::FillPatchIterator::Initialize(int, double, int, int, int)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_AmrLevel.cpp:962

14: ./Castro2d.gnu.TEST.MPI.ex() [0x57d743]
    amrex::FillPatchIterator::FillPatchIterator(amrex::AmrLevel&, amrex::MultiFab&, int, double, int, int, int)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_AmrLevel.cpp:660

15: ./Castro2d.gnu.TEST.MPI.ex() [0x57d7b5]
    amrex::AmrLevel::FillPatch(amrex::AmrLevel&, amrex::MultiFab&, int, double, int, int, int, int)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_AmrLevel.cpp:2106

16: ./Castro2d.gnu.TEST.MPI.ex() [0x418e7e]
    Castro::expand_state(amrex::MultiFab&, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro.cpp:3523

17: ./Castro2d.gnu.TEST.MPI.ex() [0x41f3b6]
    Castro::do_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:287

18: ./Castro2d.gnu.TEST.MPI.ex() [0x41f5b4]
    Castro::subcycle_advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:1242

19: ./Castro2d.gnu.TEST.MPI.ex() [0x42242a]
    Castro::advance(double, double, int, int)
    /raid/testing/castro-gfortran/Castro//Source/driver/Castro_advance.cpp:103

20: ./Castro2d.gnu.TEST.MPI.ex() [0x5733c8]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:1948

21: ./Castro2d.gnu.TEST.MPI.ex() [0x5734be]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2005

22: ./Castro2d.gnu.TEST.MPI.ex() [0x5734be]
    amrex::Amr::timeStep(int, double, int, int, double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2005

23: ./Castro2d.gnu.TEST.MPI.ex() [0x567dab]
    amrex::Amr::coarseTimeStep(double)
    /raid/testing/castro-gfortran/AMReX//Src/Amr/AMReX_Amr.cpp:2162

24: ./Castro2d.gnu.TEST.MPI.ex() [0x40951a]
    main
    /raid/testing/castro-gfortran/Castro//Source/driver/main.cpp:132

25: /lib64/libc.so.6(__libc_start_main+0xea) [0x7f68d8995f2a]
    ??
    ??:0

26: ./Castro2d.gnu.TEST.MPI.ex() [0x40e53a]
    _start
    ??:?