[SOLVED] Ardour 9: Some LV2 plugins GUI fail to be opened again once closed

Installation & Configuration Linux
#1

The first time you open a LV2 plugin UI it works fine. If you then close the GUI and open it again, you get something like this:

suil error: Failed to instantiate UI <http://gareus.org/oss/lv2/avldrums#ui_gl> in /usr/lib/lv2/avldrums.lv2/avldrumsUI_gl.so

For ZynAddSubFx, it’s even worse, as you get a SIGSEGV:

#0  DGL::puglGetNativeWindow (view=0x0) at /usr/src/debug/zynaddsubfx/zynaddsubfx-3.0.6/DPF/dgl/src/pugl-upstream/src/x11.c:1287
1287	  return (PuglNativeView)view->impl->win;
[Current thread is 1 (Thread 0x7f7083fbcb00 (LWP 12))]

I’m on Arch Linux, Ardour 9.2, and suil 0.10.26.
I’ve posted on suil bug tracker too: Fail to reopen LV2 plugins GUI for the second time on Ardour 9.2 (#12) · Issues · LV2 / suil · GitLab

Backtrace → https://gitlab.com/-/project/11853208/uploads/e104b7abe8abb392497d8f78772db8e5/backtrace.txt

#2

There were other posts on this forum which determined that Arch had broken mesa packages for some period of time. I don’t have a link at the moment, but you could search for those earlier posts and compare against the versions you have.

#3

This is a bug in Ardour’s mesa package. updating to Arch’s mesa-git should help.

See

#4

Indeed, using mesa-git from AUR fixed it. I’ll look into the proper way to report this to Arch Linux maintainers, if it’s not been done already.

Thank you very much for the prompt anwser!