KlangFalter crashes Ardour 3 (cairocanvas branch)

[prokoudine]

I'm on Fedora 20, 32bit. A3 is from cairocanvas branch, built from clean checkout on July 15.

0 0xb7ffd424 in __kernel_vsyscall ()

1 0xb4eb6b96 in raise () from /lib/libc.so.6

2 0xb4eb83d3 in abort () from /lib/libc.so.6

3 0xb4ef62f8 in __libc_message () from /lib/libc.so.6

4 0xb4efde52 in _int_free () from /lib/libc.so.6

5 0x9a6598a6 in ?? () from /home/alexandre/.lv2/KlangFalter.lv2/KlangFalter.so

6 0x9a62b79a in ?? () from /home/alexandre/.lv2/KlangFalter.lv2/KlangFalter.so

7 0x9a64f213 in ?? () from /home/alexandre/.lv2/KlangFalter.lv2/KlangFalter.so

8 0xb7be2632 in lilv_instance_deactivate (instance=0xba97b58) at /usr/include/lilv-0/lilv/lilv.h:1651

9 0xb7be9214 in ARDOUR::LV2Plugin::deactivate (this=0x12143400) at ../libs/ardour/lv2_plugin.cc:1447

10 0xb7beb9db in ARDOUR::LV2Plugin::latency_compute_run (this=0x12143400) at ../libs/ardour/lv2_plugin.cc:1920

11 0xb7be49d1 in ARDOUR::LV2Plugin::init (this=0x12143400, c_plugin=0x96e5d60, rate=48000) at ../libs/ardour/lv2_plugin.cc:582

12 0xb7be3086 in ARDOUR::LV2Plugin::LV2Plugin (this=0x12143400, engine=..., session=..., c_plugin=0x96e5d60, rate=48000) at ../libs/ardour/lv2_plugin.cc:258

13 0xb7bec419 in ARDOUR::LV2PluginInfo::load (this=0xa7e88e0, session=...) at ../libs/ardour/lv2_plugin.cc:2055

14 0x08f3b85e in PluginSelector::load_plugin (this=0xa99ca00, pi=...) at ../gtk2_ardour/plugin_selector.cc:407

15 0x08f3befa in PluginSelector::run (this=0xa99ca00) at ../gtk2_ardour/plugin_selector.cc:484

16 0x08f3e034 in PluginSelector::show_manager (this=0xa99ca00) at ../gtk2_ardour/plugin_selector.cc:853

17 0x08f41e2a in sigc::bound_mem_functor0<void, PluginSelector>::operator() (this=0xa99ad7c) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787

18 0x08f418ac in sigc::adaptor_functor<sigc::bound_mem_functor0<void, PluginSelector> >::operator() (this=0xa99ad78) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251

19 0x08f41076 in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, PluginSelector>, void>::call_it (rep=0xa99ad60) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103

20 0xb6a45e6e in Glib::SignalProxyNormal::slot0_void_callback(GObject, void_) () from /lib/libglibmm-2.4.so.1

21 0xb69b44d3 in g_cclosure_marshal_VOID__VOID () from /lib/libgobject-2.0.so.0

22 0xb69b27de in g_closure_invoke () from /lib/libgobject-2.0.so.0

23 0xb69c53e0 in signal_emit_unlocked_R () from /lib/libgobject-2.0.so.0

24 0xb69cd3c1 in g_signal_emit_valist () from /lib/libgobject-2.0.so.0

25 0xb69cd654 in g_signal_emit () from /lib/libgobject-2.0.so.0

26 0xb6647e93 in gtk_widget_activate () from /lib/libgtk-x11-2.0.so.0

27 0xb650fc7f in gtk_menu_shell_activate_item () from /lib/libgtk-x11-2.0.so.0

28 0xb651012e in gtk_menu_shell_button_release () from /lib/libgtk-x11-2.0.so.0

29 0xb6501b18 in gtk_menu_button_release () from /lib/libgtk-x11-2.0.so.0

30 0xb5df5f07 in Gtk::Widget_Class::button_release_event_callback(GtkWidget, GdkEventButton) () from /lib/libgtkmm-2.4.so.1

31 0xb64f798e in _gtk_marshal_BOOLEAN__BOXED () from /lib/libgtk-x11-2.0.so.0

32 0xb69b1275 in g_type_class_meta_marshal () from /lib/libgobject-2.0.so.0

33 0xb69b27de in g_closure_invoke () from /lib/libgobject-2.0.so.0

34 0xb69c51ca in signal_emit_unlocked_R () from /lib/libgobject-2.0.so.0

35 0xb69cd0ab in g_signal_emit_valist () from /lib/libgobject-2.0.so.0

36 0xb69cd654 in g_signal_emit () from /lib/libgobject-2.0.so.0

37 0xb6649683 in gtk_widget_event_internal () from /lib/libgtk-x11-2.0.so.0

38 0xb64f5654 in gtk_propagate_event () from /lib/libgtk-x11-2.0.so.0

39 0xb64f5a90 in gtk_main_do_event () from /lib/libgtk-x11-2.0.so.0

40 0xb634a5a9 in gdk_event_dispatch () from /lib/libgdk-x11-2.0.so.0

41 0xb68bc556 in g_main_context_dispatch () from /lib/libglib-2.0.so.0

42 0xb68bc920 in g_main_context_iterate.isra () from /lib/libglib-2.0.so.0

43 0xb68bcdc3 in g_main_loop_run () from /lib/libglib-2.0.so.0

44 0xb64f4700 in gtk_main () from /lib/libgtk-x11-2.0.so.0

45 0xb5d74735 in Gtk::Main::run_impl() () from /lib/libgtkmm-2.4.so.1

46 0xb5d74e80 in Gtk::Main::run() () from /lib/libgtkmm-2.4.so.1

47 0xb6dfa7db in Gtkmm2ext::UI::run (this=0x9956070, old_receiver=...) at ../libs/gtkmm2ext/gtk_ui.cc:278

48 0x08def7ba in main (argc=1, argv=0xbfffe994) at ../gtk2_ardour/main.cc:280

[falkTX]

Is the plugin also built from source, or are you using the pre-built binaries?

I'm looking into this. It appeared that it was crashing due to KlangFalter deactivate, but after I comment out that part ardour crashes on "Gtkmm2ext::pixbuf_from_string". There's probably some memory corruption going on here...

[prokoudine]

Ah, sorry — this is a pre-built LV2. Simply adding it to the mixer strip crashes the host. Haven't tried with Qtractor yet, though.

[falkTX]

ok, I think I found the issue.

after adding some prints to relevant parts of the code I get this: prepareToPlay 512 releaseResources processBlock 1024

this means ardour is calling process after deactivating the plugin. this is seriously wrong, and a very bad bug in ardour3. I'll report to the devs.

[falkTX]

btw, the fact that the vst version works fine is another indication that ardour3 is the culprit here

[x42]

should be fixed in Ardour 3.5-2793-gac9219a

[falkTX]

thanks very much, I'll close this now