to find out the offset for that line.

 0: ./Castro3d.gnu.DEBUG.ex() [0x8a4e58]
    amrex::BLBackTrace::print_backtrace_info(_IO_FILE*)
/home/zingale/development/amrex//Src/Base/AMReX_BLBackTrace.cpp:175:29

 1: ./Castro3d.gnu.DEBUG.ex() [0x8a4a3c]
    amrex::BLBackTrace::handler(int)
/home/zingale/development/amrex//Src/Base/AMReX_BLBackTrace.cpp:85:15

 2: /lib64/libc.so.6(+0x3ea70) [0x7f6a9da3ea70]

 3: ./Castro3d.gnu.DEBUG.ex() [0x4513c5]
    void amrex::Copy<amrex::FArrayBox, void>(amrex::FabArray<amrex::FArrayBox>&, amrex::FabArray<amr
ex::FArrayBox> const&, int, int, int, amrex::IntVect const&)
/home/zingale/development/amrex//Src/Base/AMReX_FabArray.H:250:17

 4: ./Castro3d.gnu.DEBUG.ex() [0x7545be]
    amrex::MultiFab::Copy(amrex::MultiFab&, amrex::MultiFab const&, int, int, int, int)
/home/zingale/development/amrex//Src/Base/AMReX_MultiFab.cpp:218:1

 5: ./Castro3d.gnu.DEBUG.ex() [0x9e4312]
    amrex::AmrLevel::FillPatch(amrex::AmrLevel&, amrex::MultiFab&, int, double, int, int, int, int)
/home/zingale/development/amrex//Src/Amr/AMReX_AmrLevel.cpp:2114:1

 6: ./Castro3d.gnu.DEBUG.ex() [0x424360]
    Castro::expand_state(amrex::MultiFab&, double, int)
/home/zingale/development/Castro/Exec/gravity_tests/evrard_collapse/../../../Source/driver/Castro.cp
p:4394:22

 7: ./Castro3d.gnu.DEBUG.ex() [0x45b58d]
    Castro::initialize_do_advance(double)
/home/zingale/development/Castro/Exec/gravity_tests/evrard_collapse/../../../Source/driver/Castro_ad
vance.cpp:188:18

 8: ./Castro3d.gnu.DEBUG.ex() [0x45ed4c]
    Castro::do_advance_ctu(double, double, int, int)
/home/zingale/development/Castro/Exec/gravity_tests/evrard_collapse/../../../Source/driver/Castro_ad
vance_ctu.cpp:63:10

 9: ./Castro3d.gnu.DEBUG.ex() [0x45ffb3]
    Castro::subcycle_advance_ctu(double, double, int, int)
/home/zingale/development/Castro/Exec/gravity_tests/evrard_collapse/../../../Source/driver/Castro_ad
vance_ctu.cpp:715:90

10: ./Castro3d.gnu.DEBUG.ex() [0x45b25b]
    Castro::advance(double, double, int, int)
/home/zingale/development/Castro/Exec/gravity_tests/evrard_collapse/../../../Source/driver/Castro_ad
vance.cpp:57:55

11: ./Castro3d.gnu.DEBUG.ex() [0x9cc7c4]
    amrex::Amr::timeStep(int, double, int, int, double)
/home/zingale/development/amrex//Src/Amr/AMReX_Amr.cpp:2017:44

12: ./Castro3d.gnu.DEBUG.ex() [0x9ccfaa]
    amrex::Amr::coarseTimeStep(double)
/home/zingale/development/amrex//Src/Amr/AMReX_Amr.cpp:2127:26

13: ./Castro3d.gnu.DEBUG.ex() [0x477537]
    main
/home/zingale/development/Castro/Exec/gravity_tests/evrard_collapse/../../../Source/driver/main.cpp:
163:33

14: /lib64/libc.so.6(+0x29550) [0x7f6a9da29550]
    __libc_start_call_main
/usr/src/debug/glibc-2.35-15.fc36.x86_64/csu/../sysdeps/nptl/libc_start_call_main.h:74:3

15: /lib64/libc.so.6(__libc_start_main+0x89) [0x7f6a9da29609]
    call_init inlined at /usr/src/debug/glibc-2.35-15.fc36.x86_64/csu/../csu/libc-start.c:376:5 in _
_libc_start_main@@GLIBC_2.34
/usr/src/debug/glibc-2.35-15.fc36.x86_64/csu/../csu/libc-start.c:128:20
__libc_start_main_impl
/usr/src/debug/glibc-2.35-15.fc36.x86_64/csu/../csu/libc-start.c:376:5

16: ./Castro3d.gnu.DEBUG.ex() [0x409445]
    _start at ??:?