Freeze bug

[make-your-soft-better]

If you close the application and have time to click with right mouse button on the control panel on its window in the lxpanel list, the entire panel freezes, without the possibility of recovery. It is required to restart X11 via killall -u $USER.

I think the problem is that there is an attempt to address already released data, something like a "segmentation fault".

This action can happen by accident, I've accidentally done it several times, and it's terribly annoying because it requires restarting X11. Just try to open any application, close it (for example, using ALT+F4) and immediately click on its disappearing element in the list with RMB. The whole panel will die.

[kurokawachan]

I am able to see this issue on debian stable
debian version 0.10.1-2

[kurokawachan]

Hello @make-your-soft-better

Just to make sure we are talking the same issue. Are you able to see this issue using the following way.

How to reproduce the issue

Ths issue seems to be the app been closed while the manu list is still open.

• Open lxterminal and keep only one window open.
• type the command sleep 5 && exit;
• within 5 seconds, move your mouse to the task bar and right click to open the menu
• wait for the window to close.
• There should be a blank window where the menu is
• All the button freezes
• This issue is not required to restart X11 just restart lxpanel

[make-your-soft-better]

@kurokawachan Yes, that's this issue. I repeated it, the result is the same - lxpanel freezes. Will I have to write a script for restarting lxpanel? Or how to get through to the developers?

[kurokawachan]

The issue is because inside task_button_update_windows_list
We did not gtk_menu_popdown the menu before gtk_menu_detach

            GtkMenu *menu = GTK_MENU(l->data);
            gtk_menu_popdown(menu);
            gtk_menu_detach(menu);

lxpanel/plugins/task-button.c

Lines 1543 to 1549 in ffd815f

	menu_list = g_list_copy(menu_list);
	for (l = menu_list; l; l = l->next)
	{
	GtkMenu *menu = GTK_MENU(l->data);
	gtk_menu_detach(menu);
	}
	g_list_free(menu_list);

I don't know how to get through to the developers, I have many pull requests not replied.