I have investigated this a bit. Based on stack traces the crash happens
here:
void
gtk_widget_show (GtkWidget *widget)
{
g_return_if_fail (GTK_IS_WIDGET (widget)); <==== line 3005
I'm assuming that the signal for this is attached here in gnome-panel
/panel-toplevel.c (line 2740):
signals [i++] = g_signal_connect_swapped (
toplevel->priv->attach_widget, "show",
G_CALLBACK (gtk_widget_show), toplevel);
And before the "show" signal is emitted, panel_applet_destroy() is
called from gnome-panel/applet.c. I'm guessing there's a race condition
which makes it possible to destroy PanelToplevel object and after that
send a show signal to the destroyed object.
I haven't been able to reproduce the problem myself, all tips how to do
it would help.
--
gnome-panel crashed with SIGSEGV in gtk_widget_show()
https://bugs.launchpad.net/bugs/448084
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