Segmentation fault in QuadMeshGenerator on ppc64 #7501
Description
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the information below.
- Matplotlib version, Python version and Platform (Windows, OSX, Linux ...)
python2-matplotlib-2.0.0-0.3.b4.fc26.ppc64
python-2.7.12-8.fc26.ppc64
Fedora Rawhide ppc64
- How did you install Matplotlib and Python (pip, anaconda, from source ...)
RPMs
- If possible please supply a Short, Self Contained, Correct, Example
that demonstrates the issue i.e a small piece of code which reproduces the issue
and can be run with out any other (or as few as possible) external dependencies.
I'm afraid this is a random crash when trying to build the sphinx documentation for the python-astropy package. See also https://bugzilla.redhat.com/show_bug.cgi?id=1394975
- If this is a regression (Used to work in an earlier version of Matplotlib), please
note where it used to work.
Hard to say
gdb:
Core was generated by `/usr/bin/python2 '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00003fff7b1bca14 in QuadMeshGenerator<numpy::array_view<double const, 3> >::QuadMeshPathIterator::vertex (y=0x3ffffa94a360, x=0x3ffffa94a358, idx=<optimized out>, this=0x3ffffa94ab78)
at src/_backend_agg.h:1099
1099 *x = (*m_coordinates)(n, m, 0);
(gdb) list
1094 private:
1095 inline unsigned vertex(unsigned idx, double *x, double *y)
1096 {
1097 size_t m = m_m + ((idx & 0x2) >> 1);
1098 size_t n = m_n + (((idx + 1) & 0x2) >> 1);
1099 *x = (*m_coordinates)(n, m, 0);
1100 *y = (*m_coordinates)(n, m, 1);
1101 return (idx) ? agg::path_cmd_line_to : agg::path_cmd_move_to;
1102 }
1103
(gdb) print m_coordinates
$1 = (const numpy::array_view<double const, 3> *) 0x3ffffa94ac18
(gdb) print *m_coordinates
$2 = {<numpy::detail::array_view_accessors<numpy::array_view, double const, 3>> = {<No data fields>}, m_arr = 0x3fff76c77a30, m_shape = 0x10013542510, m_strides = 0x10013542528,
m_data = 0x10013817f90 ""}
(gdb) print x
$3 = (double *) 0x3ffffa94a358
(gdb) print *x
$4 = 501.59999999999997
(gdb) print n
$5 = 986115
(gdb) print m
$6 = <optimized out>
(gdb) print m_m
$7 = 0
#1 QuadMeshGenerator<numpy::array_view<double const, 3> >::QuadMeshPathIterator::vertex (
y=0x3ffffa94a360, x=0x3ffffa94a358, this=0x3ffffa94ab78) at src/_backend_agg.h:1110
1110 return vertex(m_iterator++, x, y);
(gdb) print m_iterator
$1 = 3
(gdb) print *this
$6 = {m_iterator = 3, m_m = 0, m_n = 986114, m_coordinates = 0x3ffffa94ac18}
(gdb) print m_m + ((3 & 0x2) >> 1)
$7 = 1
(gdb) print m_n + (((3 + 1) & 0x2) >> 1)
$8 = 986114
(gdb) print *m_coordinates
$10 = {<numpy::detail::array_view_accessors<numpy::array_view, double const, 3>> = {<No data fields>}, m_arr = 0x3fff76c77a30, m_shape = 0x10013542510, m_strides = 0x10013542528,
m_data = 0x10013817f90 ""}
(gdb) print *m_coordinates->m_shape
$11 = 257
(gdb) print *m_coordinates->m_arr
$12 = {ob_refcnt = 5, ob_type = 0x3fff7e460000}
(gdb) print *m_coordinates->m_strides
$13 = 32
(gdb) print *m_coordinates->m_data
$14 = 0 '\000'
(gdb) bt
#0 0x00003fff766eca14 in QuadMeshGenerator<numpy::array_view<double const, 3> >::QuadMeshPathIterator::vertex (y=0x3fffe7591400, x=0x3fffe75913f8, idx=<optimized out>, this=0x3fffe7591c18)
at src/_backend_agg.h:1099
#1 QuadMeshGenerator<numpy::array_view<double const, 3> >::QuadMeshPathIterator::vertex (
y=0x3fffe7591400, x=0x3fffe75913f8, this=0x3fffe7591c18) at src/_backend_agg.h:1110
#2 agg::conv_transform<QuadMeshGenerator<numpy::array_view<double const, 3> >::QuadMeshPathIterator, agg::trans_affine>::vertex (this=0x3fffe7591bf0, x=0x3fffe75913f8, y=0x3fffe7591400)
at extern/agg24-svn/include/agg_conv_transform.h:43
#3 0x00003fff766ecd98 in PathNanRemover<agg::conv_transform<QuadMeshGenerator<numpy::array_view<double const, 3> >::QuadMeshPathIterator, agg::trans_affine> >::vertex (this=0x3fffe7591f80,
x=<optimized out>, y=<optimized out>) at src/path_converters.h:251
#4 0x00003fff766ed0f8 in PathClipper<PathNanRemover<agg::conv_transform<QuadMeshGenerator<numpy::array_view<double const, 3> >::QuadMeshPathIterator, agg::trans_affine> > >::vertex (
this=0x3fffe7591ff8, x=<optimized out>, y=<optimized out>) at src/path_converters.h:416
#5 0x00003fff766ed4f4 in agg::rasterizer_scanline_aa<agg::rasterizer_sl_clip<agg::ras_conv_dbl> >::add_path<PathClipper<PathNanRemover<agg::conv_transform<QuadMeshGenerator<numpy::array_view<double const, 3> >::QuadMeshPathIterator, agg::trans_affine> > > > (this=0x100413ba780,
vs=..., path_id=<optimized out>)
at extern/agg24-svn/include/agg_rasterizer_scanline_aa.h:167
#6 0x00003fff766ef604 in RendererAgg::_draw_path<PathClipper<PathNanRemover<agg::conv_transform<QuadMeshGenerator<numpy::array_view<double const, 3> >::QuadMeshPathIterator, agg::trans_affine> > > > (this=0x100413ba5f0, path=..., has_clippath=<optimized out>, face=..., gc=...)
at src/_backend_agg.h:319
#7 0x00003fff766d5894 in RendererAgg::_draw_path_collection_generic<py::PathIterator, QuadMeshGenerator<numpy::array_view<double const, 3> >, array::empty<double>, numpy::array_view<double const, 2>, numpy::array_view<double const, 2>, array::scalar<double, 1>, array::scalar<unsigned char, 1> > (has_curves=0, check_snap=0, offset_position=OFFSET_POSITION_FIGURE,
antialiaseds=<synthetic pointer>...,
linestyles=std::vector of length 11, capacity -2199010330848 = {...},
linewidths=<synthetic pointer>..., edgecolors=..., facecolors=..., offset_trans=...,
offsets=..., transforms=<synthetic pointer>..., path_generator=..., clippath_trans=...,
clippath=..., cliprect=..., master_transform=..., gc=..., this=0x100413ba5f0)
at src/_backend_agg.h:1031
#8 RendererAgg::draw_quad_mesh<numpy::array_view<double const, 3>, numpy::array_view<double const, 2>, numpy::array_view<double const, 2> > (edgecolors=..., antialiased=<optimized out>,
facecolors=..., offset_trans=..., offsets=..., coordinates=...,
mesh_height=<optimized out>, mesh_width=<optimized out>, master_transform=..., gc=...,
this=0x100413ba5f0) at src/_backend_agg.h:1174
#9 PyRendererAgg_draw_quad_mesh (self=<optimized out>, args=<optimized out>,
kwds=<optimized out>) at src/_backend_agg_wrapper.cpp:424
#10 0x00003fff7b886740 in PyCFunction_Call (
func=<built-in method draw_quad_mesh of matplotlib.backends._backend_agg.RendererAgg object at remote 0x3fff722e8bd0>, arg=<optimized out>, kw=<optimized out>)
at /usr/src/debug/Python-2.7.12/Objects/methodobject.c:116
#11 0x00003fff7b909ab0 in call_function (oparg=<optimized out>, pp_stack=0x3fffe7592318)
at /usr/src/debug/Python-2.7.12/Python/ceval.c:4427
#12 PyEval_EvalFrameEx (f=
Frame 0x1003f62c6c0, for file /usr/lib64/python2.7/site-packages/matplotlib/collections.py, line 1937, in draw (self=<QuadMesh(_label=u'_collection0', _transform=<CompositeGenericTransform(_invalid=0, input_dims=2, _b=<CompositeGenericTransform(_invalid=0, input_dims=2, _b=<BboxTransformTo(_invalid=0, _inverted=<Affine2D(_invalid=0, _inverted=None, _mtx=<numpy.ndarray at remote 0x3fff725054e0>, _shorthand_name=u'', _parents=<WeakValueDictionary(_remove=<function at remote 0x3fff7240ac08>, _pending_removals=[], _iterating=set([]), data={}) at remote 0x3fff722087a0>) at remote 0x3fff70ac7ad0>, _boxout=<TransformedBbox(_invalid=0, _transform=<BboxTransformTo(_invalid=0, _inverted=None, _boxout=<TransformedBbox(_invalid=0, _transform=<Affine2D(_invalid=0, _inverted=None, _mtx=<numpy.ndarray at remote 0x3fff721f0b20>, _shorthand_name=u'', _parents=<WeakValueDictionary(_remove=<function at remote 0x3fff72268c80>, _pending_removals=[], _iterating=set([]), data={70366364464016: <KeyedRef at remote 0x3fff71f75590>, 70...(truncated),
throwflag=<optimized out>) at /usr/src/debug/Python-2.7.12/Python/ceval.c:3061
#13 0x00003fff7b90dd98 in PyEval_EvalCodeEx (co=0x3fff77404db0, globals=<optimized out>,
locals=<optimized out>, args=<optimized out>, argcount=<optimized out>,
kws=0x3fff7b390068, kwcount=<optimized out>, defs=<optimized out>, defcount=0, closure=0x0)
at /usr/src/debug/Python-2.7.12/Python/ceval.c:3659
...
Attempted workaround with:
export MPLBACKEND=cairo
But that does not remove this completely.