---- Reported by miguel@ximian.com 2005-09-02 08:44:03 MST ----

I tried debugging a problem with aspnetedit, when I click on a button in
aspnetedit, I get the following stack trace on the command line:

free(): invalid pointer 0x8958138!

Unhandled Exception: System.NullReferenceException: Object reference not
set to an instance of an object
in <0x00000> <unknown method>
in (wrapper managed-to-native)
Gtk.FileChooserDialog:gtk_file_chooser_dialog_new (intptr,intptr,int,intptr)
in <0x000fa> Gtk.FileChooserDialog:.ctor (System.String title, Gtk.Window
parent, FileChooserAction action, System.Object[] button_data)in <0x0009d>
AspNetEdit.SampleHost.SampleHost:toolboxAddButton_Clicked (System.Object
sender, System.EventArgs e)
in (wrapper delegate-invoke)
System.MulticastDelegate:invoke_void_object_EventArgs (object,System.EventArgs)
in <0x00093> GLib.Signal:voidObjectCallback (IntPtr handle, IntPtr gch)
in (wrapper native-to-managed) GLib.Signal:voidObjectCallback (intptr,intptr)
in <0x00000> <unknown method>
in (wrapper managed-to-native) Gtk.Application:gtk_main ()
in <0x00007> Gtk.Application:Run ()
in <0x00c9e> AspNetEdit.SampleHost.SampleHost:Main ()

So about 11 levels deep.  If I run this with mdb, I get:

free(): invalid pointer 0x89affa8!
Process @4 received signal 11 at #0: 0x40315ded.
0x40315ded	mov    0x4(%eax),%edx
(mdb) where
(*) #0: 0x40315ded
    #1: 0x4031622b
    #2: 0x447c20db
    #3: 0x447c2702
    #4: 0x447c5389
    #5: 0x447cb05f
    #6: 0x43b4e9b7
    #7: 0x43b57dd9
    #8: 0x447c90a3
    #9: 0x447c87be
    #10: 0x4474bcdc
    #11: 0x41b2aac1
    #12: 0x4191710b
    #13: 0x41917254
    #14: 0x4191760f
    #15: 0x419158a8
    #16: 0x443dab68
    #17: 0x443db506
    #18: 0x418f9875
    #19: 0x418e6bc4
    #20: 0x418e7271
    #21: 0x418e77e4
    #22: 0x418ea66f
    #23: 0x41d1feac
    #24: 0x41d20414
    #25: 0x41d2054a
    #26: 0x418ee9a5
    #27: 0x418efcb9
    #28: 0x41d1feac
    #29: 0x41d203b8
    #30: 0x41d2054a
    #31: 0x418e3a10
    #32: 0x41d1feac
    #33: 0x41d20414
    #34: 0x41d2054a
    #35: 0x418e3cc0
    #36: 0x418e3d45
    #37: 0x431d459e
    #38: 0x431d42e9
    #39: 0x431d3a76 in
AspNetEdit.SampleHost.SampleHost.toolboxAddButton_Clicked(System.Object,System.EventArgs)+0xc6
at /home/cvs/aspeditor/src/aspnetedit/SampleHost.cs:306
    #40: 0x41e823ba in <(wrapper delegate-invoke)
System.MulticastDelegate:invoke_void_object_EventArgs
(object,System.EventArgs)>+0x52 at 46
    #41: 0x4305c4f8 in
GLib.Signal.voidObjectCallback(System.IntPtr,System.IntPtr)+0xc0 at
/home/cvs/gtk-sharp/glib/Signal.cs:175
    #42: 0x41e71abe in <(wrapper native-to-managed)
GLib.Signal:voidObjectCallback (intptr,intptr)>+0x36 at 13
    #43: 0x41d287b1
    #44: 0x41d19d9b
    #45: 0x41d2b286
    #46: 0x41d2c371
    #47: 0x41d2c575
    #48: 0x41a061bd
    #49: 0x41d287b1
    #50: 0x41d19d9b
    #51: 0x41d2aca0
    #52: 0x41d2c371
    #53: 0x41d2c6a2
    #54: 0x418714af
    #55: 0x418726d7
    #56: 0x41d287b1
    #57: 0x41d19a87
    #58: 0x41d19d9b
    #59: 0x41d2aae2
    #60: 0x41d2c371
    #61: 0x41d2c6a2
    #62: 0x418713fc
    #63: 0x4187251d
    #64: 0x41941c8c
    #65: 0x41d19a87
    #66: 0x41d19d9b
    #67: 0x41d2b0d6
    #68: 0x41d2c0cc
    #69: 0x41d2c6a2
    #70: 0x41a5f89e
    #71: 0x41a5f3d6
    #72: 0x41940061
    #73: 0x4193eb9d
    #74: 0x41b7f1e1
    #75: 0x40257e87
    #76: 0x4025a5c7
    #77: 0x4025b7b7
    #78: 0x4193e25d
    #79: 0x431d2289 in <(wrapper managed-to-native)
Gtk.Application:gtk_main ()>+0x29 at 9
    #80: 0x431d2248 in Gtk.Application.Run()+0x8 at
/home/cvs/gtk-sharp/gtk/Application.cs:100
    #81: 0x40d9dc1e in AspNetEdit.SampleHost.SampleHost.Main()+0x13ae at
/home/cvs/aspeditor/src/aspnetedit/SampleHost.cs:197

So 81 frames, so my feeling is that there is something wrong on that stack
trace



---- Additional Comments From miguel@ximian.com 2005-09-05 13:52:34 MST ----

reassigning to new debugger owner.



---- Additional Comments From martin@ximian.com 2005-09-05 13:55:02 MST ----

The stack trace is from an application called `aspnetedit' which is in
trunk/aspnetedit in SVN.



---- Additional Comments From martin@ximian.com 2005-09-07 13:45:37 MST ----

Closing as INVALID, give me a real application with real dependencies
with actually builds.



---- Additional Comments From miguel@ximian.com 2005-09-07 15:02:15 MST ----

I just built it, it works.

If you have problems building it, find me on irc, and we can discuss it.



---- Additional Comments From miguel@ximian.com 2005-09-08 10:52:00 MST ----

Here is a small test case:

1. Compile: mcs a.cs -pkg:gtk-sharp
2. Run inside mdb: mdb a.exe
    (mdb) cont
3. Click on button.
4. Issue the "where" command

using Gtk;
using System;

class D {
	D val;

	static void Main ()
	{
		Application.Init ();
		Window w = new Window ("XX");
		Button b = new Button ("Hola");
		w.Add (b);
		b.Clicked += delegate {
			D d = new D ();
			D x = d.val.val;
		};
		w.ShowAll ();
		Application.Run ();
	}
}





---- Additional Comments From martin@ximian.com 2005-09-08 11:50:45 MST ----

After fixing a small issue, I'm getting this:

(mdb) c
Process @4 received signal 11 at #0: 0x40de61d4.
0x40de61d4      mov    0x8(%eax),%eax
(mdb) bt
(*) #0: 0x40de61d4
    #1: 0x40de618a
    #2: 0x40de5310 in
GLib.Signal.voidObjectCallback(System.IntPtr,System.IntPtr)+0xc0 at
/home/martin/monocvs/gtk-sharp/glib/Signal.cs:181
    #3: 0x40de514e in <(wrapper native-to-managed)
GLib.Signal:voidObjectCallback (intptr,intptr)>+0x36 at 13
    #4: 0x4188e7b1 in g_cclosure_marshal_VOID__VOID+0xa1
    #5: 0x4187fd9b in g_closure_invoke+0x10b
    #6: 0x41891286 in g_signal_chain_from_overridden+0x1506
    #7: 0x41892371 in g_signal_emit_valist+0x941
    #8: 0x418926a2 in g_signal_emit+0x32
    #9: 0x41427101 in gtk_button_clicked+0x51
    #10: 0x41428185 in gtk_button_new+0xd85
    #11: 0x4188e7b1 in g_cclosure_marshal_VOID__VOID+0xa1
    #12: 0x4187fa87 in g_closure_ref+0x137
    #13: 0x4187fd9b in g_closure_invoke+0x10b
    #14: 0x41890ae2 in g_signal_chain_from_overridden+0xd62
    #15: 0x41892371 in g_signal_emit_valist+0x941
    #16: 0x418926a2 in g_signal_emit+0x32
    #17: 0x414271b1 in gtk_button_released+0x51
    #18: 0x4142723f in gtk_button_released+0xdf
    #19: 0x414e9024 in gtk_marshal_BOOLEAN__VOID+0x38b4
    #20: 0x4187fa87 in g_closure_ref+0x137
    #21: 0x4187fd9b in g_closure_invoke+0x10b
    #22: 0x418910d6 in g_signal_chain_from_overridden+0x1356
    #23: 0x418920cc in g_signal_emit_valist+0x69c
    #24: 0x418926a2 in g_signal_emit+0x32
    #25: 0x415e0e64 in gtk_widget_get_default_style+0x364
    #26: 0x414e14e9 in gtk_propagate_event+0xc9
    #27: 0x414e2a11 in gtk_main_do_event+0x371
    #28: 0x416ebc22 in gdk_add_client_message_filter+0x1b2
    #29: 0x40294e87 in g_main_context_dispatch+0x1d7
    #30: 0x402975c7 in g_main_context_acquire+0x5a7
    #31: 0x402987b7 in g_main_loop_run+0x207
    #32: 0x414e2ec3 in gtk_main+0xb3
    #33: 0x40de5231 in <(wrapper managed-to-native)
Gtk.Application:gtk_main ()>+0x29 at 9
    #34: 0x40de51f0 in Gtk.Application.Run()+0x8 at
/home/martin/monocvs/gtk-sharp/gtk/Application.cs:100
    #35: 0x40ddc89d in D.Main()+0xd5 at
/home/martin/monocvs/debugger/test/A.cs:19
(mdb)




---- Additional Comments From martin@ximian.com 2005-09-08 12:52:17 MST ----

This should now be fixed as of r49715.



---- Additional Comments From martin@ximian.com 2006-04-18 13:04:09 MST ----

Old.



---- Additional Comments From miguel@ximian.com 2006-04-18 13:31:59 MST ----

Wow, the stack trace looks beautiful now.


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