[Octave-bug-tracker] [bug #31931] figure (1, "visible", "off") -> Bus error

[John W. Eaton]

Follow-up Comment #2, bug #31931 (project octave):

I'm not seeing the crash immediately after the call to figure, but if I do
see a segfault if I do


octave:1> backend ("fltk"); figure (1, "visible", "off")
octave:2> sombrero


The beginning of the backtrace is:


(gdb) where
#0  0x00007ffff3d744c1 in fl_set_gl_context(Fl_Window*, __GLXcontextRec*) ()
   from /usr/lib/libfltk_gl.so.1.1
#1  0x00007ffff3d74bc8 in Fl_Gl_Window::make_current() ()
   from /usr/lib/libfltk_gl.so.1.1
#2  0x00007fffeaeac3f3 in figure_manager::do_update_canvas (this=0x7e5c80, 
    go=<value optimized out>, id=2004)
    at /home/jwe/src/octave/src/DLD-FUNCTIONS/fltk_backend.cc:1639
#3  figure_manager::update_canvas (this=0x7e5c80, go=<value optimized out>, 
    id=2004) at /home/jwe/src/octave/src/DLD-FUNCTIONS/fltk_backend.cc:1491
#4  fltk_backend::update (this=0x7e5c80, go=<value optimized out>, id=2004)
    at /home/jwe/src/octave/src/DLD-FUNCTIONS/fltk_backend.cc:1811
#5  0x00007ffff7249d7b in graphics_backend::update (this=0x7fffffff7fa0, 
    go=..., id=2004) at ./graphics.h:1912
#6  0x00007ffff7142451 in base_property::set (this=0xd06538, v=..., 
    do_run=true) at /home/jwe/src/octave/src/graphics.cc:776
#7  0x00007ffff7248067 in handle_property::operator= (this=0xd06538, h=...)
    at ./graphics.h:1325
#8  0x00007ffff7219f6e in figure::properties::set_currentaxes (this=0xd05950,

    v=...) at /home/jwe/src/octave/src/graphics.cc:2706
#9  0x00007ffff716c9b0 in figure::properties::set (this=0xd05950, 
    pname_arg=..., val=...) at ./graphics-props.cc:742
#10 0x00007ffff72535fd in figure::set (this=0xd05940, name=..., value=...)
    at ./graphics.h:4205
---Type <return> to continue, or q <return> to quit---
#11 0x00007ffff714ae6f in graphics_object::set_value_or_default (
    this=0x7fffffff85d0, name=..., val=...)
    at /home/jwe/src/octave/src/graphics.cc:1788
#12 0x00007ffff714a6ac in graphics_object::set (this=0x7fffffff85d0,
args=...)
    at /home/jwe/src/octave/src/graphics.cc:1644
#13 0x00007ffff723c038 in Fset (args=..., nargout=0)
    at /home/jwe/src/octave/src/graphics.cc:6043
#14 0x00007ffff743c465 in octave_builtin::do_multi_index_op (this=0x6a7290, 
    nargout=0, args=..., lvalue_list=0x0)
    at /home/jwe/src/octave/src/ov-builtin.cc:129
#15 0x00007ffff743c139 in octave_builtin::subsref (this=0x6a7290, type=..., 
    idx=..., nargout=0, lvalue_list=0x0)
    at /home/jwe/src/octave/src/ov-builtin.cc:64
#16 0x00007ffff743c025 in octave_builtin::subsref (this=0x6a7290, type=..., 
    idx=..., nargout=0) at /home/jwe/src/octave/src/ov-builtin.cc:47
#17 0x00007ffff74dec6a in octave_value::subsref (this=0x7fffffff8c60, 
    type=..., idx=..., nargout=0) at /home/jwe/src/octave/src/ov.cc:1202
#18 0x00007ffff74decf8 in octave_value::subsref (this=0x7fffffff8c60, 
    type=..., idx=..., nargout=0, lvalue_list=0x0)
    at /home/jwe/src/octave/src/ov.cc:1213
#19 0x00007ffff756fa6e in tree_index_expression::rvalue (this=0xe0d6b0, 
    nargout=0, lvalue_list=0x0) at /home/jwe/src/octave/src/pt-idx.cc:408
#20 0x00007ffff756f024 in tree_index_expression::rvalue (this=0xe0d6b0, 
---Type <return> to continue, or q <return> to quit---
    nargout=0) at /home/jwe/src/octave/src/pt-idx.cc:278
#21 0x00007ffff756fc0e in tree_index_expression::rvalue1 (this=0xe0d6b0, 
    nargout=0) at /home/jwe/src/octave/src/pt-idx.cc:419
#22 0x00007ffff7569259 in tree_evaluator::visit_statement (
    this=0x7ffff7dddd38, stmt=...) at
/home/jwe/src/octave/src/pt-eval.cc:737
#23 0x00007ffff75876f0 in tree_statement::accept (this=0xe0d480, tw=...)
    at /home/jwe/src/octave/src/pt-stmt.cc:152
#24 0x00007ffff7569446 in tree_evaluator::visit_statement_list (
    this=0x7ffff7dddd38, lst=...) at /home/jwe/src/octave/src/pt-eval.cc:773
#25 0x00007ffff7587aa2 in tree_statement_list::accept (this=0xe036d0,
tw=...)
    at /home/jwe/src/octave/src/pt-stmt.cc:216
#26 0x00007ffff7568cd2 in tree_evaluator::visit_if_command_list (
    this=0x7ffff7dddd38, lst=...) at /home/jwe/src/octave/src/pt-eval.cc:574
#27 0x00007ffff7585d68 in tree_if_command_list::accept (this=0xe0d1a0,
tw=...)
    at /home/jwe/src/octave/src/pt-select.cc:84
#28 0x00007ffff7568bba in tree_evaluator::visit_if_command (
    this=0x7ffff7dddd38, cmd=...) at /home/jwe/src/octave/src/pt-eval.cc:552
#29 0x00007ffff75860ee in tree_if_command::accept (this=0xe11500, tw=...)
    at /home/jwe/src/octave/src/pt-select.cc:109



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