MembraneSynth crash on Linux running Renoise

[powerjungle]

Renoise LOG> Vst3Plugs: Instantiating: /home/music-plugins/vst3/MembraneSynth.vst3...
Renoise LOG> Vst3Plugs: Failed to suggest speaker arrangement (not critical)
"/home/renoise/.config/UhhyouPlugins/style/style.json" is not regular file or doesn't exist.
Renoise LOG> Vst3Window: Creating a new main window...
Renoise LOG> Vst3Window: Setting window properties...
Renoise LOG> Vst3Window: Creating plugin parent window...
Renoise LOG> Vst3Window: Mapping the window...
Renoise LOG> Vst3Window: Attaching the plugin to the plugin parent window...
Renoise LOG> Vst3Window: Plugin requested new Windowsize 710, 480
Renoise LOG> Vst3Window: Plugin window attached via _XEMBED_INFO
Renoise LOG> Vst3Window: Closing the Editor...
Renoise LOG> Vst3Window: Editor was closed
Renoise LOG> Vst3Window: Creating a new main window...
Renoise LOG> Vst3Window: Setting window properties...
Renoise LOG> Vst3Window: Creating plugin parent window...
Renoise LOG> Vst3Window: Mapping the window...
Renoise LOG> Vst3Window: Attaching the plugin to the plugin parent window...
Renoise LOG> Vst3Window: Plugin requested new Windowsize 710, 480
Renoise LOG> Vst3Window: Plugin window attached via _XEMBED_INFO
Renoise LOG> Vst3Window: Closing the Editor...
Renoise LOG> Vst3Window: Editor was closed
Renoise LOG> Vst3Window: Creating a new main window...
Renoise LOG> Vst3Window: Setting window properties...
Renoise LOG> Vst3Window: Creating plugin parent window...
Renoise LOG> Vst3Window: Mapping the window...
Renoise LOG> Vst3Window: Attaching the plugin to the plugin parent window...
Renoise LOG> CrashLog: Caught signal: SIGSEGV (11) ...
Renoise LOG> Vst3Plugs: Plugin 'Uhhyou: MembraneSynth' crashed while calling one of its plugin view functions!
Renoise LOG> Vst3Window: FAILED to attach plugin editor (4)
Renoise LOG> Vst3Window: Closing the Editor...
Renoise LOG> Vst3Window: Editor was closed
Renoise LOG> Warning Message: Ouch. The VST3 plugin 'Uhhyou: MembraneSynth (from Uhhyou)' crashed in event, function or class: 'IPluginView', Thread: 'GUI'
Renoise LOG> Warning Message: IMPORTANT: This is a fatal error. Please save the current document under a !new! name to prevent losing important data. Renoise will silently ignore any following errors from this plug-in.
Renoise LOG> Warning Message: DO NOT IGNORE THIS ERROR; DO NOT CONTINUE USING THE PLUGIN. THIS CAN DESTROY YOUR SONG OR CAUSE OTHER RANDOM CRASHES AND PROBLEMS!
Renoise LOG> Warning Message: It's most likely that this is a bug in the VST3 plugin, so please also report this problem to the authors of this plugin in order to get the problem fixed!

I am running:

• Gentoo Linux
• Renoise v3.4.2
• MembraneSynth 0.1.1

[powerjungle]

MaybeSnare and BasicLimiter crash as well for me. I suspect that all of them will. The weird thing is that the GUI loads properly, but after opening it 2-3 times, then the crash happens. The plugins work properly until then as well.

[ryukau]

Hi, @powerjungle. Thanks for the report.

If you are using VSTGUI 4.11.0 or earlier, following issue might be the cause.

• [Linux] Close/reopen editor several times crashes the host steinbergmedia/vstgui#249

If you are already on VSTGUI 4.11.1 or later, then I'd suggest to build VST 3 SDK example plugins, and see if they also crash on Renoise or not.

If the issue is specific to my plugins, I probably can't fix the bug by myself, because of the lack of X.Org knowledge and my faulty Linux environment. I need help here.

In case the crash is specific to my plugins, Following parts of code are probably related.

• VSTPlugins/common/gui/plugeditor.hpp
• VSTPlugins/common/gui/x11runloop.hpp

RunLoop is copied from VSTGUI.

• vstgui/vstgui/plugin-bindings/vst3editor.cpp

---

For reference, this comment is mostly same as the following one.

• Package uhhyou-plugins osam-cologne/archlinux-proaudio#162 (comment)

[powerjungle]

Okay so I cloned: https://github.com/steinbergmedia/vst3sdk.git
I checked out: HEAD detached at v3.7.7_build_19
Meaning VSTGUI should be v4.12.0, gotten from: vst3sdk/vstgui4/vstgui/lib/vstguibase.h
I ran: git submodule update --init --checkout --recursive
After which I created the "build" directory, cd to it and ran: cmake ../ && cmake --build . --config Release
I fixed the "limits" problem from here: steinbergmedia/vst3sdk#99
After which it built correctly, then I grabbed "hostchecker.vst3" and ran it in my DAW. It had the same problem as your plugins, meaning it's either something from my OS or from Renoise.

This is the log:

Renoise LOG> Vst3Window: Creating a new main window...
Renoise LOG> Vst3Window: Setting window properties...
Renoise LOG> Vst3Window: Creating plugin parent window...
Renoise LOG> Vst3Window: Mapping the window...
Renoise LOG> Vst3Window: Attaching the plugin to the plugin parent window...
Renoise LOG> Vst3Window: Plugin requested new Windowsize 600, 400
Renoise LOG> Vst3Window: Plugin window attached via _XEMBED_INFO
Renoise LOG> Vst3Window: Closing the Editor...
/home/programming/Development/git-repos/vst3sdk/vstgui4/vstgui/lib/platform/linux/x11timer.cpp:38: Assertion 'runLoop' failed. Timer only works of run loop was set
renoise: /home/programming/Development/git-repos/vst3sdk/vstgui4/vstgui/lib/vstguidebug.cpp:124: void VSTGUI::doAssert(const char*, const char*, const char*, const char*): Assertion `false' failed.
Renoise LOG> CrashLog: Caught signal: SIGABRT (6) ...
Renoise LOG> Vst3Plugs: Plugin 'Steinberg Media Technologies: VST3 Host Checker' crashed while calling one of its plugin view functions!
Renoise LOG> Vst3Window: Editor was closed

[powerjungle]

I couldn't test in Reaper, because "hostchecker.vst3" doesn't even show up there for some reason.

[ryukau]

For makeshift mitigation, it's possible to turn off GUI by commenting out following part of code.

• VSTPlugins/common/plugcontroller.hpp

  Lines 123 to 128 in 8ddc204

  	if (name && strcmp(name, "editor") == 0) {
  	auto plugEditor = new EditorType(this);
  	plugEditor->remember();
  	editor.push_back(plugEditor);
  	return plugEditor;
  	}

The number of parameters is relatively small for MembraneSynth. So it might be usable with fallback GUI provided by host.

[powerjungle]

That's a good idea, but I would like to investigate the GUI problem further. If I find anything, I will add it to this issue. I will close it now, since it's not a problem from your code probably.

[ryukau]

To @powerjungle,

It appears that there are 2 different bugs that crash VST 3 plugins on Renoise. I found this while investigating issue #28.

One is specific to Uhhyou Plugins, and fixed at aa58b94 on develop branch. This commit might solve the issue on your environment.

Other is a bug on VSTGUI, and it's probably related to the use of bitmap. This one is causing the crash of VST 3 SDK example plugins, but it's not related to Uhhyou Plugins.

Sorry for inconvenience.