Failed to initialize GLArea on XLibre master branch

[fish4terrisa-MSDSM]

Select the version

Git master branch

Describe your issue

GDK programs are unable to create GL context, e.g. localsend

(localsend:170953): Gdk-CRITICAL **: 17:48:53.569: gdk_gl_context_make_current: assertion 'GDK_IS_GL_CONTEXT (context)' failed

** (localsend:170953): WARNING **: 17:48:53.569: Failed to initialize GLArea: Unable to create a GL context

I'm using master branch Xlibre, 25.1.8 works fine. Not sure about the real cause.

Steps to reproduce

Install xlibre-xserver and localsend, start a x server and execute localsend. Even adding LIBGL_ALWAYS_SOFTWARE=1 to env didnt help, so I dont believe it's related with the driver or gpu.

What did you expect?

I expect GDK programs to function normally.

Additional Information

I'll try to git bisect and find the exact problem later, tho I'm quite busy these days so it's gonna take some time for me to finish this.

Extra fields

• I have checked the existing issues
• I have read the Contributing Guidelines
• I'd like to work on this issue

[fish4terrisa-MSDSM]

Ok so with git bisect this commit seem to be the reason:

5d96fc048e02120357530bea5cf28c13774566c7 is the first 'bad' commit

and it's

commit 5d96fc048e02120357530bea5cf28c13774566c7
Author: Enrico Weigelt, metux IT consult <info@metux.net>
Date:   Thu Jun 25 17:37:27 2026 +0200

    glx: reject duplicate GLX drawable for a window (fix UAF in DrawableGone)

Simply git revert this commit fixed everything for me, including the problem in #3283 (which probably share the same cause and the log provided by winit could be helpful for debugging this issue)

[fish4terrisa-MSDSM]

What's weird is that this commit is meant to fix #1491, but I cannot reproduce the crash using the example provided there, even with this commit reverted.

[kiyoshispreclerg]

What's weird is that this commit is meant to fix #1491, but I cannot reproduce the crash using the example provided there, even with this commit reverted.

Same here, had to revert 5d96fc0, in my case obs-vkcapture was causing crashes since this commit. That #1491 bug affected only my XOrg install, but XLibre was never affected. I was planning to open an issue, now I just add my comment here

[fish4terrisa-MSDSM]

Maybe overlapping XIDs have to be supported since so many clients are doing it wrong...

[metux]

Maybe overlapping XIDs have to be supported since so many clients are doing it wrong...

This shouldn't happen, but maybe the clients are actually broken and prior Xservers silently accepted it.
Can you make a trace, which XIDs they're actually using ?

[fish4terrisa-MSDSM]

Maybe overlapping XIDs have to be supported since so many clients are doing it wrong...

This shouldn't happen, but maybe the clients are actually broken and prior Xservers silently accepted it. Can you make a trace, which XIDs they're actually using ?

Xtrace doesnt work here on my machine for whatever reason(for anything related with GLX), tho I'll try to get a wireshark dump and see

[cepelinas9000]

@fish4terrisa-MSDSM could you try with #3213 applied?

[fish4terrisa-MSDSM]

@fish4terrisa-MSDSM could you try with #3213 applied?

Already, didnt fix anything. Reverting that commit is the only choice currently I found.