Mesa segfault on Ubuntu 24.04 when enabled multisampling

[1vanK]

Description

App code:

SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 4);

GH action code:

    - name: CTest
      run: |
        export LIBGL_ALWAYS_SOFTWARE=true
        xvfb-run ctest --verbose --test-dir build --timeout 60

With multisamples == 8 my program segfaulted even on version 20250120.5.0, but worked with multisamples == 4: https://github.com/dviglo2d/dviglo2d/actions/runs/12973723294/job/36322364098

Now on version 20250126.1.0 my program will segfault with any value of multisampling: https://github.com/dviglo2d/dviglo2d/actions/runs/13070569995/job/36471112891

[1vanK]

Way to repoduce:

Fork https://github.com/dviglo2d/dviglo2d and change

//engine_params::msaa_samples = 8;

in https://github.com/dviglo2d/dviglo2d/blob/main/minimal_app/src/app.cpp

[kishorekumar-anchala]

Hi @1vanK - Thanks for reporting the issue, we will look into this ASAP and get back to you ! . Thank you !

[kishorekumar-anchala]

Hi @1vanK - does it work with ubuntu 22 image ? could you please check and confirm?

[1vanK]

Ubuntu 22.04 have no g++-13 complier. It is necessary because the engine uses std::format().

[kishorekumar-anchala]

Duplicate of #11471

please find the comment ,may it will useful.

@1vanK - #11471 (comment)

[1vanK]

I don't understand how this relates to my case and how it can help me?