Re: EXC_BAD_ACCESS [was: persistent listeners]

[logari81]

On Thu, 2011-03-10 at 21:20 +0000, bpabbott wrote:
> On Mar 10, 2011, at 02:34 PM, Konstantinos Poulios
> <address@hidden> wrote:
> 
> 
> > On Wed, Mar 9, 2011 at 12:16 PM, Konstantinos Poulios
> > <address@hidden> wrote:
> > > In the new implementation of subplot we have the problem that the
> > > listeners that we use for the synchronization of subplots are
> > deleted
> > > once something is plotted on a subplot.
> > >
> > > The attached patches implement persistent listeners, i.e.:
> > >
> > > 1. listeners added with:
> > > addlistener (handle, propertyname, cbfunction, "persistent")
> > > will not be removed by the c++ method "remove_all_listeners", nor
> > by a
> > > call to delete_listener() with empty arguments list.
> > >
> > > 2. however, explicitly removing a persistent listener from the
> > frontend with:
> > > dellistener (handle, propertyname, cbfunction)
> > > should still work.
> > >
> > > Please take a look at the patches so that I can push them if it is
> > ok,
> > > so that we can make some progress with the subplot fixes.
> > >
> > > Kostas
> > >
> > 
> > I have just pushed a modified/fixed version of these patches.
> > Actually
> > with a bit modified policy than the one described in my previous
> > mail:
> > 
> > 1. One can add a persistent listener with
> > addlistener (handle, propertyname, cbfunction, "persistent")
> > 
> > 2 One can delete all persistent listeners on a property with
> > dellistener (handle, propertyname, "persistent")
> > 
> > This change will allow us to fix the known issues with subplot.
> > 
> > Regards
> > 
> > Kostas
>  
> With this in place, Octave crashes for me when I try to create a plot
> with fltk active.
> 
> 
> octave:1> graphics_toolkit fltk
> 
> Reading symbols for shared libraries . done
> 
> Reading symbols for shared libraries . done
> 
> octave:2> plot (1:10)
> 
> Reading symbols for shared libraries . done
> 
> 
> Program received signal EXC_BAD_ACCESS, Could not access memory.
> 
> Reason: KERN_PROTECTION_FAILURE at address: 0x00000000
> 
> 0x927d725e in glMatrixMode ()
> 
> (gdb) bt
> 
> #0  0x927d725e in glMatrixMode ()
> 
> #1  0x03705dbe in OpenGL_fltk::setup_viewport ()
> at 
> /Users/bpabbott/Development/mercurial/octave/src/DLD-FUNCTIONS/__init_fltk__.cc:146
> 
> #2  0x03705dbe in OpenGL_fltk::resize (this=0x3609a50, xx=0, yy=20,
> ww=640, hh=440) at DLD-FUNCTIONS/__init_fltk__.cc:129
> 
> #3  0x037155d6 in fltk_uimenu::show ()
> at 
> /Users/bpabbott/Development/mercurial/octave/src/DLD-FUNCTIONS/__init_fltk__.cc:788
> 
> #4  0x037155d6 in plot_window::show_menubar ()
> at 
> /Users/bpabbott/Development/mercurial/octave/src/DLD-FUNCTIONS/__init_fltk__.cc:789
> 
> #5  0x037155d6 in plot_window::plot_window (this=0x36094d0, xx=0,
> yy=0, ww=640, hh=480, address@hidden) at
> DLD-FUNCTIONS/__init_fltk__.cc:737
> 
> #6  0x03715caa in plot_window [inlined] ()
> at 
> /Users/bpabbott/Development/mercurial/octave/src/DLD-FUNCTIONS/__init_fltk__.cc:755
> 
> #7  0x03715caa in figure_manager::do_new_window (this=0x33b8870,
> address@hidden) at DLD-FUNCTIONS/__init_fltk__.cc:1572
> 
> #8  0x037042bb in figure_manager::new_window ()
> at 
> /Users/bpabbott/Development/mercurial/octave/src/DLD-FUNCTIONS/__init_fltk__.cc:1450
> 
> #9  0x037042bb in __fltk_redraw__ () at
> DLD-FUNCTIONS/__init_fltk__.cc:1767
> 
> #10 0x03715f77 in fltk_graphics_toolkit::redraw_figure
> (this=0x3606c40, address@hidden) at
> DLD-FUNCTIONS/__init_fltk__.cc:1865
> 
> #11 0x001fdef4 in graphics_toolkit::redraw_figure ()
> at /Users/bpabbott/Development/mercurial/octave/src/graphics.h:7618
> 
> #12 0x001fdef4 in Fdrawnow (address@hidden) at graphics.cc:7618
> 
> #13 0x00498fad in octave_builtin::do_multi_index_op (this=0x3864140,
> nargout=0, address@hidden, lvalue_list=0x0) at ov-builtin.cc:128
> 
> #14 0x00499377 in octave_builtin::do_multi_index_op (this=0x3864140,
> nargout=0, address@hidden) at ov-builtin.cc:98
> 
> #15 0x0007e578 in octave_value::do_multi_index_op (this=0xbfffb518,
> nargout=0, address@hidden) at ov.cc:1266
> 
> #16 0x0005d5f1 in feval (address@hidden, address@hidden,
> nargout=0) at oct-parse.yy:4140
> 
> #17 0x0003af99 in interactive_input (address@hidden,
> force_readline=false) at input.cc:237
> 
> #18 0x0003ba25 in std::string::operator= () at /usr/include/c
> ++/4.2.1/bits/basic_string.h:280
> 
> #19 0x0003ba25 in octave_gets [inlined] ()
> at /Users/bpabbott/Development/mercurial/octave/src/input.cc:280
> 
> #20 get_user_input [inlined] ()
> at /Users/bpabbott/Development/mercurial/octave/src/input.cc:351
> 
> #21 0x0003ba25 in octave_read (buf=0x3a50600 "", max_size=8192) at
> input.cc:373
> 
> #22 0x0003ccd3 in yy_get_next_buffer () at lex.cc:3097
> 
> #23 0x0004df11 in octave_lex () at lex.cc:2939
> 
> #24 0x00063a9d in octave_parse () at oct-parse.cc:2395
> 
> #25 0x0041a5c9 in main_loop () at toplev.cc:567
> 
> #26 0x003b591d in octave_main (argc=6, argv=0xbfffc354, embedded=0) at
> octave.cc:935
> 
> #27 0x00001f80 in main (argc=6, argv=0xbfffc354) at main.c:35
> 
> 
> Occasionally, I see some strange results on MacOS. Can someone else
> confirm this behavior?
> 
> 
> Ben
> 
> 

Hmm, this is very strange because normal plotting shouldn't involve any
listeners at all, should it? I couldn't reproduce this issue on two
different computers but I cannot try it on a Mac.

Have you tried rebuilding everything from scratch?

Kostas