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Re: EXC_BAD_ACCESS [was: persistent listeners]

From: bpabbott
Subject: Re: EXC_BAD_ACCESS [was: persistent listeners]
Date: Thu, 10 Mar 2011 21:20:00 +0000 (GMT)

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.


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?


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