Good spot :o) Best guess it is dereferencing the exposure time array: os << " exposure time: " << s.exposure_times_.const_ref()[0] << "\n"; Markus added a test which currently fails… taking a look now Cheers Graeme

On 4 Apr 2018, at 22:04, James Holton wrote:

The following sequence of commands:

% source build/setpaths.csh % libtbx.python

...

...

...

import dxtbx from dxtbx import model print dxtbx.model.Scan()

seems to cause Python itself to core dump. Is this expected?

show_stack(1): <stdin>(1) <module> libc backtrace (25 frames, most recent call last): /home/jamesh/projects/cctbx-dev/build/../base/bin/python2.7() [0x400659] /lib64/libc.so.6(__libc_start_main+0xfd) [0x34e961ed1d] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(Py_Main+0xc74) [0x7f93eb5c2b74] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(PyRun_AnyFileExFlags+0x4c) [0x7f93eb5ad78c] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(PyRun_InteractiveLoopFlags+0x4e) [0x7f93eb5ad04e] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(PyRun_InteractiveOneFlags+0x195) [0x7f93eb5ace35] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(PyEval_EvalCode+0x32) [0x7f93eb58d4e2] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x88e) [0x7f93eb58d3ce] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x3ef0) [0x7f93eb589de0] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(PyFile_WriteObject+0x78) [0x7f93eb503b58] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(+0x958f2) [0x7f93eb5288f2] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(PyObject_Str+0xa) [0x7f93eb52879a] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(_PyObject_Str+0x7b) [0x7f93eb5286ab] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(+0xb5a1e) [0x7f93eb548a1e] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(PyEval_CallObjectWithKeywords+0x43) [0x7f93eb584fd3] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(PyObject_Call+0x53) [0x7f93eb4dc093] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(+0x5b6cf) [0x7f93eb4ee6cf] /home/jamesh/projects/cctbx-dev/base/bin/../lib/libpython2.7.so.1.0(PyObject_Call+0x53) [0x7f93eb4dc093] /home/jamesh/projects/cctbx-dev/build/lib/libboost_python.so(+0x2d088) [0x7f93e3f23088] /home/jamesh/projects/cctbx-dev/build/lib/libboost_python.so(boost::python::handle_exception_impl(boost::function0<void>)+0x43) [0x7f93e3f34013] /home/jamesh/projects/cctbx-dev/build/lib/libboost_python.so(+0x2fe08) [0x7f93e3f25e08] /home/jamesh/projects/cctbx-dev/build/lib/libboost_python.so(boost::python::objects::function::call(_object*, _object*) const+0xef) [0x7f93e3f251ff] /home/jamesh/projects/cctbx-dev/build/lib/dxtbx_model_ext.so(boost::python::objects::caller_py_function_impl > >::operator()(_object*, _object*)+0x83) [0x7f93db88a7a3] /home/jamesh/projects/cctbx-dev/build/lib/dxtbx_model_ext.so(dxtbx::model::boost_python::scan_to_string(dxtbx::model::Scan const&)+0x319) [0x7f93db871929] /lib64/libc.so.6() [0x34e9632510] Segmentation fault (Python and libc call stacks above)

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