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Gtkmm-forge Digest, Vol 11, Issue 3

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Today's Topics:

   1. [Bug 419923] No key press events signals for some	keys
      (gtkmm (bugzilla.gnome.org))
   2. [Bug 425644] Gtk::ComboBox::append_text()
      (gtkmm (bugzilla.gnome.org))
   3. [Bug 422955] The application crashes with SIGSEGV	in
      ComboBoxText destructor (gtkmm (bugzilla.gnome.org))
   4. [Bug 422955] The application crashes with SIGSEGV	in
      ComboBoxText destructor (gtkmm (bugzilla.gnome.org))
   5. [Bug 422955] The application crashes with SIGSEGV	in
      ComboBoxText destructor (gtkmm (bugzilla.gnome.org))
   6. [Bug 422955] The application crashes with SIGSEGV	in
      ComboBoxText destructor (gtkmm (bugzilla.gnome.org))
   7. [Bug 422955] The application crashes with SIGSEGV	in
      ComboBoxText destructor (gtkmm (bugzilla.gnome.org))


----------------------------------------------------------------------

Message: 1
Date: Thu,  5 Apr 2007 12:44:32 +0000 (UTC)
From: "gtkmm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 419923] No key press events signals for
	some	keys
To: gtkmm-forge lists sourceforge net
Message-ID: <20070405124432 11E6F6C4129 box gnome org>
Content-Type: text/plain; charset=utf-8

If you have any questions why you received this email, please see the text at
the end of this email. Replies to this email are NOT read, please see the text
at the end of this email. You can add comments to this bug at:
  http://bugzilla.gnome.org/show_bug.cgi?id=419923

  gtkmm | general | Ver: 2.4




------- Comment #3 from Murray Cumming  2007-04-05 12:44 UTC -------
Hey. This is intruiging. How about a C test case?


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Message: 2
Date: Thu,  5 Apr 2007 13:15:38 +0000 (UTC)
From: "gtkmm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 425644] Gtk::ComboBox::append_text()
To: gtkmm-forge lists sourceforge net
Message-ID: <20070405131538 41C926C4129 box gnome org>
Content-Type: text/plain; charset=utf-8

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  gtkmm | build | Ver: 2.8.x

Murray Cumming changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |murrayc murrayc com




------- Comment #2 from Murray Cumming  2007-04-05 13:15 UTC -------
The reference documentation says 
"See also ComboBoxText, which is specialised for a single text column."

I don't know how to make it clearer, particularly because ComboBoxText will
rarely be good enough, because you will often need a second ID column.


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------------------------------

Message: 3
Date: Thu,  5 Apr 2007 20:54:16 +0000 (UTC)
From: "gtkmm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 422955] The application crashes with
	SIGSEGV	in ComboBoxText destructor
To: gtkmm-forge lists sourceforge net
Message-ID: <20070405205416 A37216C46A8 box gnome org>
Content-Type: text/plain; charset=utf-8

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  gtkmm | general | Ver: 2.8.x




------- Comment #3 from Slava Gorbunov  2007-04-05 20:54 UTC -------
(In reply to comment #2)
> I can't reproduce this, and valgrind doesn't show any problems when doing this
> either.
When application crashes, valgrind doesn't show any errors, too (except for the
segfault itself, of course). I suppose that it doesn't relate to incorrect
memory access, but it is concerned with reference counting. Probably it is
related to focus handling. I have found that there is two requirements for
crash:
1. during the lifetime of window, first combobox gets focus at some moment
2. when the window is being destroyed, the second combobox (on the second page)
has focus

> Do you have similar problems with the gtkmm examples? I suspect a
> gentoo-related problem.
I can't find suitable example (two comboboxes on different pages of
Gtk::Notebook). Other gtkmm programs (inkscape for example) work well - the
problem appears only under very special conditions, such as described above. I
don't think that this bug is gentoo-related. As I have noticed above, the same
behavior (crash) is observed on SuSe 10.2 (x86).

Maybe your architecture is different from mine? I'm using x86 (p3m and p4-based
celeron). If you are not, please, try to test it on x86.

I can post the core dumps if required.


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------------------------------

Message: 4
Date: Fri,  6 Apr 2007 07:03:47 +0000 (UTC)
From: "gtkmm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 422955] The application crashes with
	SIGSEGV	in ComboBoxText destructor
To: gtkmm-forge lists sourceforge net
Message-ID: <20070406070347 C9FC46C417C box gnome org>
Content-Type: text/plain; charset=utf-8

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the end of this email. Replies to this email are NOT read, please see the text
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  gtkmm | general | Ver: 2.8.x




------- Comment #4 from Murray Cumming  2007-04-06 07:03 UTC -------
OK. Please post a gdb backtrace, with debugging symbols.

Maybe I am not reproducing the steps correctly. For instance, "On the first
page of Gtk::Notebook (which is currently opened) click the ComboBoxText, and
select the sole item" is odd, because the sole item is already selected.


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------------------------------

Message: 5
Date: Fri,  6 Apr 2007 09:58:41 +0000 (UTC)
From: "gtkmm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 422955] The application crashes with
	SIGSEGV	in ComboBoxText destructor
To: gtkmm-forge lists sourceforge net
Message-ID: <20070406095841 C30416C4184 box gnome org>
Content-Type: text/plain; charset=utf-8

If you have any questions why you received this email, please see the text at
the end of this email. Replies to this email are NOT read, please see the text
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  gtkmm | general | Ver: 2.8.x




------- Comment #5 from Slava Gorbunov  2007-04-06 09:58 UTC -------
(In reply to comment #4)
> OK. Please post a gdb backtrace, with debugging symbols.
OK, I'll do it during the time. I need to recompile gtkmm with debugging
symbols enabled to do this.

> Maybe I am not reproducing the steps correctly. For instance, "On the first
> page of Gtk::Notebook (which is currently opened) click the ComboBoxText, and
> select the sole item" is odd, because the sole item is already selected.
Yes, apparently, you didn't understand me correctly. It isn't important what
item is selected in combobox; but it is important that combobox receives input
focus. To reproduce the crash, you need to move focus to the first combobox (no
matter how - by keyboard or by mouse), then switch to the second page, move
focus to the second combobox (if it isn't there already), then close the
window. At the moment of the destruction of the window, the second combobox
should have focus.


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------------------------------

Message: 6
Date: Fri,  6 Apr 2007 10:51:29 +0000 (UTC)
From: "gtkmm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 422955] The application crashes with
	SIGSEGV	in ComboBoxText destructor
To: gtkmm-forge lists sourceforge net
Message-ID: <20070406105129 18D176C417F box gnome org>
Content-Type: text/plain; charset=utf-8

If you have any questions why you received this email, please see the text at
the end of this email. Replies to this email are NOT read, please see the text
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  http://bugzilla.gnome.org/show_bug.cgi?id=422955

  gtkmm | general | Ver: 2.8.x




------- Comment #6 from Murray Cumming  2007-04-06 10:51 UTC -------
Yes, I can now reproduce it on both Ubuntu Edgy and Ubuntu Feisty. I have to
click twice on each combo box and then close the window.

I get:
murrayc murrayc-desktop:~$ ./a.out 

(a.out:10439): GLib-GObject-CRITICAL **: g_object_ref: assertion
`object->ref_count > 0' failed
Segmentation fault (core dumped)

valgrind shows me:
(a.out:10496): GLib-GObject-CRITICAL **: g_object_ref: assertion
`object->ref_count > 0' failed
==10496== 
==10496== Invalid read of size 4
==10496==    at 0x490F00A: g_type_class_meta_marshal (gclosure.c:565)
==10496==    by 0x491081A: g_closure_invoke (gclosure.c:490)
==10496==    by 0x4921789: signal_emit_unlocked_R (gsignal.c:2370)
==10496==    by 0x4922816: g_signal_emit_valist (gsignal.c:2199)
==10496==    by 0x49229D8: g_signal_emit (gsignal.c:2243)
==10496==    by 0x44686B3: gtk_container_set_focus_child (gtkcontainer.c:1356)
==10496==    by 0x461E274: gtk_widget_unparent (gtkwidget.c:2091)
==10496==    by 0x445E9AE: gtk_combo_box_menu_destroy (gtkcombobox.c:2680)
==10496==    by 0x4464B2D: gtk_combo_box_finalize (gtkcombobox.c:5011)
==10496==    by 0x4912B6B: g_object_unref (gobject.c:1788)
==10496==    by 0x4912EB7: g_object_run_dispose (gobject.c:574)
==10496==    by 0x451E09D: gtk_object_destroy (gtkobject.c:403)
==10496==    by 0x41F1A48: Gtk::Object::_destroy_c_instance() (object.cc:166)
==10496==    by 0x41F1B6E: Gtk::Object::destroy_() (object.cc:264)
==10496==    by 0x41B5120: Gtk::ComboBox::~ComboBox() (combobox.cc:230)
==10496==    by 0x804D8D1: Gtk::ComboBoxText::~ComboBoxText() (in
/home/murrayc/a.out)
==10496==    by 0x804DEDE: page::~page() (in /home/murrayc/a.out)
==10496==    by 0x804E532: nb::~nb() (in /home/murrayc/a.out)
==10496==    by 0x804D795: main (in /home/murrayc/a.out)
==10496==  Address 0x0 is not stack'd, malloc'd or (recently) free'd


We really need a a C test case to confirm that this is not a gtkmm bug.


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------------------------------

Message: 7
Date: Fri,  6 Apr 2007 11:10:40 +0000 (UTC)
From: "gtkmm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 422955] The application crashes with
	SIGSEGV	in ComboBoxText destructor
To: gtkmm-forge lists sourceforge net
Message-ID: <20070406111040 481AF6C4181 box gnome org>
Content-Type: text/plain; charset=utf-8

If you have any questions why you received this email, please see the text at
the end of this email. Replies to this email are NOT read, please see the text
at the end of this email. You can add comments to this bug at:
  http://bugzilla.gnome.org/show_bug.cgi?id=422955

  gtkmm | general | Ver: 2.8.x




------- Comment #7 from Slava Gorbunov  2007-04-06 11:10 UTC -------
(In reply to comment #6)
> We really need a a C test case to confirm that this is not a gtkmm bug.
I also suspect that it may be a GTK+ (not gtkmm) bug. But, unfortunately, I
don't know GTK+ well enough to write an equivalent program in pure GTK+.


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