I ran gdb --args midori --debug and run the program from there, I tried to do bt but it says "no stack". Although I closed only a tab from several I had open, it closed all of them. gdb says that it had exited normally: Starting program: /usr/bin/midori --debug [Depuración de hilo usando libthread_db enabled] Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1". [Nuevo Thread 0xb363bb40 (LWP 28742)] [Nuevo Thread 0xb2cffb40 (LWP 28743)] (midori:28741): Gtk-WARNING **: Theme parsing error: button.css:98:14: Not using units is deprecated. Assuming 'px'. (midori:28741): Gtk-WARNING **: Theme parsing error: button.css:98:14: Junk at end of value Launching command: '/usr/bin/gdb' --batch -ex 'set print thread-events off' -ex run -ex 'set logging on /tmp/midori-alekhios/gdb.bt' -ex 'bt' --return-child-result --args /usr/bin/midori [Depuración de hilo usando libthread_db enabled] Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1". (midori:28746): Gtk-WARNING **: Theme parsing error: button.css:98:14: Not using units is deprecated. Assuming 'px'. (midori:28746): Gtk-WARNING **: Theme parsing error: button.css:98:14: Junk at end of value (midori4:28746): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.32.4/./gobject/gsignal.c:2459: signal `context-menu' is invalid for instance `0x803b9020' (midori4:28746): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.32.4/./gobject/gsignal.c:2459: signal `context-menu' is invalid for instance `0x803b9170' (midori4:28746): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.32.4/./gobject/gsignal.c:2459: signal `context-menu' is invalid for instance `0x803b92c0' (midori4:28746): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.32.4/./gobject/gsignal.c:2459: signal `context-menu' is invalid for instance `0x803b9410' (midori4:28746): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.32.4/./gobject/gsignal.c:2459: signal `context-menu' is invalid for instance `0x803b9560' (midori4:28746): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.32.4/./gobject/gsignal.c:2459: signal `context-menu' is invalid for instance `0x803b96b0' (midori4:28746): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.32.4/./gobject/gsignal.c:2459: signal `context-menu' is invalid for instance `0x803b9800' ** (midori4:28746): CRITICAL **: midori_browser_get_action_group: assertion `MIDORI_IS_BROWSER (browser)' failed ** (midori4:28746): CRITICAL **: midori_context_action_add_action_group: assertion `action_group != NULL' failed Program received signal SIGSEGV, Segmentation fault. 0x8003276c in midori_browser_get_n_pages () #0 0x8003276c in midori_browser_get_n_pages () #1 0x800582a5 in midori_view_get_tab_menu () #2 0x800585be in ?? () #3 0x80058b90 in ?? () #4 0xb7f861a3 in g_cclosure_marshal_VOID__PARAM () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #5 0xb7f83484 in g_closure_invoke () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #6 0xb7f950d9 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #7 0xb7f9d2cc in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #8 0xb7f9d443 in g_signal_emit () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #9 0xb7f87c5f in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #10 0xb7f89810 in g_object_notify () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #11 0xb614bdc2 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #12 0xb614f717 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #13 0xb66fc33c in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #14 0xb66fb14d in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #15 0xb66ece2e in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #16 0xb673c306 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #17 0xb6732bb3 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #18 0xb6732880 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #19 0xb66ead12 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #20 0xb66eb06c in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #21 0xb66f7093 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #22 0xb66fb303 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #23 0xb617ecee in webkit_web_view_stop_loading () from /usr/lib/libwebkitgtk-3.0.so.0 #24 0xb617f4c8 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0 #25 0xb7f895c7 in g_object_run_dispose () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #26 0xb7c55a31 in gtk_widget_destroy () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #27 0xb7a235af in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #28 0xb7b810bb in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #29 0xb7a74087 in gtk_container_foreach () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #30 0xb7a75309 in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #31 0xb7b80b0d in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #32 0xb7f851ec in g_cclosure_marshal_VOID__VOID () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #33 0xb7f822fd in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #34 0xb7f833d2 in g_closure_invoke () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #35 0xb7f94fa3 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #36 0xb7f9d2cc in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #37 0xb7f9d443 in g_signal_emit () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #38 0xb7c622dc in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #39 0xb7f895c7 in g_object_run_dispose () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #40 0xb7c55a31 in gtk_widget_destroy () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #41 0xb7b44456 in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #42 0xb7a74087 in gtk_container_foreach () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #43 0xb7a75309 in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #44 0xb7f851ec in g_cclosure_marshal_VOID__VOID () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #45 0xb7f822fd in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #46 0xb7f833d2 in g_closure_invoke () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #47 0xb7f94fa3 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #48 0xb7f9d2cc in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #49 0xb7f9d443 in g_signal_emit () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #50 0xb7c622dc in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #51 0xb7f895c7 in g_object_run_dispose () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #52 0xb7c55a31 in gtk_widget_destroy () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #53 0xb7a2741b in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #54 0xb7a74087 in gtk_container_foreach () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #55 0xb7a75309 in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #56 0xb7f851ec in g_cclosure_marshal_VOID__VOID () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #57 0xb7f822fd in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #58 0xb7f83484 in g_closure_invoke () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #59 0xb7f94fa3 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #60 0xb7f9d2cc in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #61 0xb7f9d443 in g_signal_emit () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #62 0xb7c622dc in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #63 0xb7f881a2 in g_object_unref () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #64 0xb7c66d49 in gtk_widget_unparent () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #65 0xb595bcac in granite_widgets_dynamic_notebook_remove_tab () from /usr/lib/libgranite.so.1 #66 0xb595bdb5 in ?? () from /usr/lib/libgranite.so.1 #67 0xb7f85243 in g_cclosure_marshal_VOID__VOIDv () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #68 0xb7f83727 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #69 0xb7f9ca19 in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #70 0xb7f9d89f in g_signal_emit_by_name () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #71 0xb5954eb5 in ?? () from /usr/lib/libgranite.so.1 #72 0xb7f85243 in g_cclosure_marshal_VOID__VOIDv () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #73 0xb7f83727 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #74 0xb7f9ca19 in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #75 0xb7f9d443 in g_signal_emit () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #76 0xb7a332aa in gtk_button_clicked () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #77 0xb7a349a0 in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #78 0xb7f851ec in g_cclosure_marshal_VOID__VOID () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #79 0xb7f822fd in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #80 0xb7f83484 in g_closure_invoke () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #81 0xb7f95535 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #82 0xb7f9d2cc in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #83 0xb7f9d443 in g_signal_emit () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #84 0xb7a32be6 in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #85 0xb7b0d291 in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #86 0xb7f81db7 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #87 0xb7f83727 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #88 0xb7f9ca19 in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #89 0xb7f9d443 in g_signal_emit () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 #90 0xb7c5736b in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #91 0xb7b0ac2f in ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #92 0xb7b0ce50 in gtk_main_do_event () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #93 0xb792963c in ?? () from /usr/lib/i386-linux-gnu/libgdk-3.so.0 #94 0xb7952828 in ?? () from /usr/lib/i386-linux-gnu/libgdk-3.so.0 #95 0xb7ec3d46 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0 #96 0xb7ec40e5 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0 #97 0xb7ec452b in g_main_loop_run () from /lib/i386-linux-gnu/libglib-2.0.so.0 #98 0xb7b0bfe5 in gtk_main () from /usr/lib/i386-linux-gnu/libgtk-3.so.0 #99 0x80021fdd in main () [Thread 0xb2cffb40 (LWP 28743) terminado] [Thread 0xb397b880 (LWP 28741) terminado] [Inferior 1 (process 28741) exited normally] (gdb) bt No stack. (gdb)