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Segfault when attempting to open LV2 plugin's native UI #1319

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djiamnot opened this issue Nov 22, 2021 · 16 comments
Closed

Segfault when attempting to open LV2 plugin's native UI #1319

djiamnot opened this issue Nov 22, 2021 · 16 comments
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@jcelerier
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bug Linux / BSD
Milestone
release/3.5

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@djiamnot
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Platform:

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.3 LTS"

On a freshly compiled score from master (as of 2021-11-21), I can see a list of LV2 plugins and use them until I try to open the native interface. It segfaults. I observed the same behaviour on several plugins. Below you will find score's output:

./run.sh 
QVariant::load: unknown user type with name TimeVal.
Using highest available OpenGL version: 4.6
Warning: plugin "/home/mis/src/_externs/score/build/plugins/libscore_lib_base.so" is not a correct score plugin.
Warning: plugin "/home/mis/src/_externs/score/build/plugins/libscore_lib_device.so" is not a correct score plugin.
Warning: plugin "/home/mis/src/_externs/score/build/plugins/libscore_lib_inspector.so" is not a correct score plugin.
Warning: plugin "/home/mis/src/_externs/score/build/plugins/libscore_lib_localtree.so" is not a correct score plugin.
Warning: plugin "/home/mis/src/_externs/score/build/plugins/libscore_lib_state.so" is not a correct score plugin.
pd 0.51.4
bonk version 1.5
fiddle version 1.1 TEST4
pd~ version 0.54
pique 0.1 for PD version 23
sigmund~ version 0.07
error: failed to open file /usr/lib/lv2/gx_colwah.lv2/manifest.ttl (No such file or directory)
lilv_world_load_file(): error: Error loading file `file:///usr/lib/lv2/gx_colwah.lv2/manifest.ttl'
lilv_world_load_bundle(): error: Error reading file:///usr/lib/lv2/gx_colwah.lv2/manifest.ttl
D: ../../../src/asound/bluealsa-pcm.c:1002: Getting BlueALSA PCM: CAPTURE 74:D8:3E:60:9A:04 a2dp
D: ../../../src/asound/bluealsa-pcm.c:1002: Getting BlueALSA PCM: PLAYBACK 74:D8:3E:60:9A:04 a2dp
D: ../../../src/asound/bluealsa-pcm.c:1002: Getting BlueALSA PCM: CAPTURE 74:D8:3E:60:9A:04 a2dp
D: ../../../src/asound/bluealsa-pcm.c:1002: Getting BlueALSA PCM: PLAYBACK 74:D8:3E:60:9A:04 a2dp
D: ../../../src/asound/bluealsa-pcm.c:1002: Getting BlueALSA PCM: PLAYBACK 74:D8:3E:60:9A:04 a2dp
D: ../../../src/asound/bluealsa-pcm.c:1002: Getting BlueALSA PCM: PLAYBACK 74:D8:3E:60:9A:04 a2dp
error: failed to open file /usr/lib/lv2/gx_wah.lv2/gx_colwah.ttl (No such file or directory)
lilv_world_load_file(): error: Error loading file `file:///usr/lib/lv2/gx_wah.lv2/gx_colwah.ttl'
lilv_plugin_get_name(): warning: Plugin <http://guitarix.sourceforge.net/plugins/gx_colwah_#_colwah_> has no (mandatory) doap:name
lilv_plugin_get_name(): warning: Plugin <http://guitarix.sourceforge.net/plugins/gx_colwah_#_colwah_> has no (mandatory) doap:name
lilv_plugin_get_name(): warning: Plugin <http://guitarix.sourceforge.net/plugins/gx_colwah_#_colwah_> has no (mandatory) doap:name
Debug: Audio device emits changed: Dataflow::AudioDevice(0x560fc0ae51c0) (:0)
Debug: Could not save device (:0)
lilv_plugin_get_name(): warning: Plugin <http://guitarix.sourceforge.net/plugins/gx_colwah_#_colwah_> has no (mandatory) doap:name
Calf Monosynth requires 
Required uri: http://lv2plug.in/ns/ext/urid#map

Calf Monosynth requires 
Required uri: http://lv2plug.in/ns/ext/port-props#supportsStrictBounds
Required uri: http://lv2plug.in/ns/lv2core#hardRTCapable

lilv_plugin_get_name(): warning: Plugin <http://guitarix.sourceforge.net/plugins/gx_colwah_#_colwah_> has no (mandatory) doap:name
Warning: QObject::connect: signal not found in color_widgets::Swatch (:0)
lilv_plugin_get_name(): warning: Plugin <http://guitarix.sourceforge.net/plugins/gx_colwah_#_colwah_> has no (mandatory) doap:name
lilv_plugin_get_name(): warning: Plugin <http://guitarix.sourceforge.net/plugins/gx_colwah_#_colwah_> has no (mandatory) doap:name

(ossia-score:332466): GLib-GObject-WARNING **: 14:44:42.335: cannot register existing type 'GdkDisplayManager'

(ossia-score:332466): GLib-CRITICAL **: 14:44:42.335: g_once_init_leave: assertion 'result != 0' failed

(ossia-score:332466): GLib-GObject-CRITICAL **: 14:44:42.335: g_object_new_with_properties: assertion 'G_TYPE_IS_OBJECT (object_type)' failed

(ossia-score:332466): GLib-GObject-WARNING **: 14:44:42.335: invalid (NULL) pointer instance

(ossia-score:332466): GLib-GObject-CRITICAL **: 14:44:42.335: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

(ossia-score:332466): GLib-GObject-WARNING **: 14:44:42.335: invalid (NULL) pointer instance

(ossia-score:332466): GLib-GObject-CRITICAL **: 14:44:42.335: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

(ossia-score:332466): GLib-GObject-WARNING **: 14:44:42.339: cannot register existing type 'GdkDisplay'

(ossia-score:332466): GLib-CRITICAL **: 14:44:42.339: g_once_init_leave: assertion 'result != 0' failed

(ossia-score:332466): GLib-GObject-CRITICAL **: 14:44:42.339: g_type_register_static: assertion 'parent_type > 0' failed

(ossia-score:332466): GLib-CRITICAL **: 14:44:42.339: g_once_init_leave: assertion 'result != 0' failed

(ossia-score:332466): GLib-GObject-CRITICAL **: 14:44:42.339: g_object_new_with_properties: assertion 'G_TYPE_IS_OBJECT (object_type)' failed
Segmentation fault

and a gdb stacktrace:

#0  0x00007fff91b57aa5 in gdk_display_open () at /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#1  0x00007fff91b2616a in gdk_display_open_default_libgtk_only () at /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#2  0x00007fffb4194f4d in gtk_init () at /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#3  0x00007fffb77827ee in suil_wrapper_new () at /usr/lib/x86_64-linux-gnu/suil-0/libsuil_gtk2_in_qt5.so
#4  0x00007fffbbf6505c in suil_instance_new () at /usr/lib/x86_64-linux-gnu/libsuil-0.so.0
#5  0x00007fffbbfc0f4b in LV2::Window::Window(LV2::Model const&, score::DocumentContext const&, QWidget*) ()
    at /home/mis/src/_externs/score/build/plugins/libscore_plugin_lv2.so
#6  0x00007fffbbfc2d96 in Process::EffectLayerFactory_T<LV2::Model, Process::DefaultEffectItem, LV2::Window>::makeExternalUI(Process::ProcessModel const&, score::DocumentContext const&, QWidget*) const ()
    at /home/mis/src/_externs/score/build/plugins/libscore_plugin_lv2.so
#7  0x00007fffcff9d9b6 in Process::setupExternalUI(Process::ProcessModel const&, Process::LayerFactory const&, score::DocumentContext const&, bool) () at /home/mis/src/_externs/score/build/plugins/libscore_lib_process.so
#8  0x00007ffff5c1c458 in QMetaObject::activate(QObject*, int, int, void**) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ffff79c1cc6 in non-virtual thunk to score::QGraphicsPixmapToggle::mousePressEvent(QGraphicsSceneMouseEvent*) () at /home/mis/src/_externs/score/build/plugins/libscore_lib_base.so
#10 0x00007ffff6911b4a in QGraphicsItem::sceneEvent(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x00007ffff6935627 in  () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007ffff693dacb in  () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007ffff693dcff in QGraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent*) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#14 0x00007ffff694727a in QGraphicsScene::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007ffff660aa66 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007ffff66140f0 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007ffff79d84d5 in SafeQApplication::notify(QObject*, QEvent*) ()
    at /home/mis/src/_externs/score/build/plugins/libscore_lib_base.so
#18 0x00007ffff5bf093a in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#0  0x00007fff91b57aa5 in gdk_display_open () at /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#1  0x00007fff91b2616a in gdk_display_open_default_libgtk_only () at /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#2  0x00007fffb4194f4d in gtk_init () at /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#3  0x00007fffb77827ee in suil_wrapper_new () at /usr/lib/x86_64-linux-gnu/suil-0/libsuil_gtk2_in_qt5.so
#4  0x00007fffbbf6505c in suil_instance_new () at /usr/lib/x86_64-linux-gnu/libsuil-0.so.0
#5  0x00007fffbbfc0f4b in LV2::Window::Window(LV2::Model const&, score::DocumentContext const&, QWidget*) ()
    at /home/mis/src/_externs/score/build/plugins/libscore_plugin_lv2.so
#6  0x00007fffbbfc2d96 in Process::EffectLayerFactory_T<LV2::Model, Process::DefaultEffectItem, LV2::Window>::makeExternalUI(Process::ProcessModel const&, score::DocumentContext const&, QWidget*) const ()
    at /home/mis/src/_externs/score/build/plugins/libscore_plugin_lv2.so
#7  0x00007fffcff9d9b6 in Process::setupExternalUI(Process::ProcessModel const&, Process::LayerFactory const&, score::DocumentContext const&, bool) () at /home/mis/src/_externs/score/build/plugins/libscore_lib_process.so
#8  0x00007ffff5c1c458 in QMetaObject::activate(QObject*, int, int, void**) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ffff79c1cc6 in non-virtual thunk to score::QGraphicsPixmapToggle::mousePressEvent(QGraphicsSceneMouseEvent*) () at /home/mis/src/_externs/score/build/plugins/libscore_lib_base.so
#10 0x00007ffff6911b4a in QGraphicsItem::sceneEvent(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x00007ffff6935627 in  () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007ffff693dacb in  () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007ffff693dcff in QGraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent*) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#14 0x00007ffff694727a in QGraphicsScene::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007ffff660aa66 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007ffff66140f0 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007ffff79d84d5 in SafeQApplication::notify(QObject*, QEvent*) ()
    at /home/mis/src/_externs/score/build/plugins/libscore_lib_base.so
#18 0x00007ffff5bf093a in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#37 0x00007ffff5fdb10b in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#38 0x00007ffff5fb535b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#39 0x00007ffff144432e in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#40 0x00007ffff421417d in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#41 0x00007ffff4214400 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#42 0x00007ffff42144a3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007ffff5c48565 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#44 0x00007ffff5bef4db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#45 0x00007ffff5bf7246 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#46 0x0000555555569b40 in main ()
@jcelerier
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Thanks, what are the offending plug-ins ?

jcelerier added a commit that referenced this issue Nov 23, 2021
@jcelerier
[linux] Tentative fix for #1319
c798143
@jcelerier
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Tried something according to what I could read on the internets, if you can pull and try the above

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ah I can reproduce with the Calf plug-ins indeed... :|

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hmmm... I tried to check other hosts: Qtractor and LMMS but it seems that neither try to show the native UI for Calf plugs, so I'm wondering if there's a deeper incompatibility here ? I thought the suil library was used to make this work but maybe not... @rncbc any idea if that is just not a tractable problem ? (or did I just miss the open GUI button in Qtractor :x)

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rncbc commented Nov 23, 2021 •
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qtractor does open both ways: a generic stock GUI (plugin > Properties...) and the plugin's native GUI if it has one (plugin > Edit...).

only qtractor builds of yore Qt5 may use libSUIL; on Qt6, qtractor uses its own LV2UI wrappers to X11 and Gtk2 LV2 GUIs (nb. calf is the later kind); of course, qtractor has to be built with all the necessary support for Gtk2+ development libraries and headers, for it to work or show the Calf GUIs.

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okay, when trying here, Plugin > [Edit...] does not open anything so I guess it's my distro's build (which uses Qt6) which lacks the relevant things

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jcelerier commented Nov 23, 2021 •
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I think I got it @djiamnot ! To check that it was the same issue than you have, can you try to open the GUI while the score is playing and has reached the LV2 execution ?

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djiamnot commented Nov 23, 2021 •
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after a pull and rebuild, score seems to hang after displaying this in the terminal:

QVariant::load: unknown user type with name TimeVal.

(ossia-score:378853): GLib-GObject-WARNING **: 10:54:03.978: cannot register existing type 'GdkDisplayManager'

(ossia-score:378853): GLib-CRITICAL **: 10:54:03.978: g_once_init_leave: assertion 'result != 0' failed

(ossia-score:378853): GLib-GObject-CRITICAL **: 10:54:03.978: g_object_new_with_properties: assertion 'G_TYPE_IS_OBJECT (object_type)' failed

it does nothing after that, does not open its window, either.

But for the record, the noted issue was with Calf and Gx (guitarix) plugins. Just before the pull I tried with some LSP plugins and Nekobi which appeared to work fine.

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jcelerier commented Nov 23, 2021 •
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hummm, could you try using a gtk2 theme like it says here ?
https://bugs.launchpad.net/ubuntu/+source/qtstyleplugins-src/+bug/1874102

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jcelerier commented Nov 23, 2021 •
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see also https://bbs.archlinux.org/viewtopic.php?id=214147&p=2

@jcelerier jcelerier reopened this Nov 23, 2021
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hum, so after trying on an ubuntu VM, it turns out that just this code:

#include <QApplication>
#include <QLabel>
#include <dlfcn.h>

int main(int argc, char** argv)
{
  using gdk_init_check_ptr = void *(*)(int*, char***);
  auto gdk = dlopen("libgdk-x11-2.0.so.0", RTLD_LAZY | RTLD_LOCAL);
  auto gdk_init_check = (gdk_init_check_ptr)dlsym(gdk, "gdk_init_check");

  gdk_init_check(nullptr, nullptr);

  QApplication app{argc, argv};

  QLabel label{"foo"};
  label.show();

  return app.exec();
}

fails, because by default on Ubuntu the theme is qgtk3 which already calls gdk_init and calling it twice either hangs or crashes. -_-

@jcelerier
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in the meantime @djiamnot what you can do is :

sudo apt install qt5-style-plugins
QT_QPA_PLATFORMTHEME=gtk2 ./ossia-score

with that, it seems to work here on a 20.04 VM...

@djiamnot
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That's so funny! I confirm that it works, however yesterday it was not. It may have been user error, I run fish as default shell and there may be some detail in handling environment variables interaction that escapes me. It now runs correctly in both bash and fish and I can open LV2 native interfaces, including Calf and Gx. Thank you for your patience and sorry for the noise.

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no worries, it's not noise, the problem still exists (but I don't see an easy way out of it right now..)

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(reported lv2/suil#16 on suil, maybe some answer will come out of it..)

@jcelerier jcelerier self-assigned this Nov 24, 2021
@jcelerier jcelerier added this to the release/3.5 milestone Nov 24, 2021
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upstream LV2 / Suil has removed support for displaying GTK2 UIs altogether so this is no longer relevant

@jcelerier jcelerier moved this to Done in Platform support Jul 16, 2024
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