Created attachment 169964 [details] screenshot of kwin_wayland trace when starting in VM using the virgl driver SUMMARY I booted the Fedora Rawhide/41 KDE Plasma live image Fedora-KDE-Live-x86_64-Rawhide-20240529.n.0.iso in a QEMU/KVM VM using GNOME Boxes with 3D acceleration enabled using the virgl driver from mesa 24.1.0. The screen remained black with just a blinking text cursor at the top left. I switched to VT2. The journal showed kwin_wayland 6.0.90.1 crashed repeatedly when starting due to errors including. kwin_wayland_wrapper[1788]: No provider of glBufferStorage found. Requires one of: kwin_wayland_wrapper[1788]: Desktop OpenGL 4.4 kwin_wayland_wrapper[1788]: GL_ARB_buffer_storage kwin_wayland_wrapper[1788]: GL_EXT_buffer_storage The journal above that showed virgl had OpenGL 4.3 support. I guess virgl doesn't support OpenGL 4,4, GL_ARB_buffer_storage, or GL_EXT_buffer_storage. I'm attaching a trace of the first of ten such kwin_wayland crashes as a screenshot since I'm unsure how to copy or send text from bash in a VT in a VM to the host. The crashes were aborts in gl_provider_resolver in libepoxy, but they involved various kwin functions below that. Various other Plasma processes crashed after that. The crashes happened on 2/2 boots. The problem is likely that virgl doesn't meet the requirements of kwin 6.0.90, but I'm reporting to kwin since it prevented Plasma from starting. STEPS TO REPRODUCE 1. Boot a Fedora 40 KDE Plasma installation updated to 2024-5-29 with updates-testing enabled 2. Log in to Plasma 6.0.5 on Wayland 3. Start Konsole 4. Install GNOME Boxes if it isn't already with sudo dnf install gnome-boxes 5. Download Fedora-KDE-Live-x86_64-Rawhide-20240529.n.0.iso from https://koji.fedoraproject.org/koji/buildinfo?buildID=2458143 6. Start GNOME Boxes 7. Boot Fedora-KDE-Live-x86_64-Rawhide-20240529.n.0.iso in a GNOME Boxes QEMU/KVM VM with 3 GiB RAM, UEFI enabled, and 3D acceleration enabled using the virgl driver OBSERVED RESULT kwin_wayland 6.0.90.1 crashed repeatedly when starting in VMs using the virgl driver resulting in a black screen EXPECTED RESULT No crashes would happen SOFTWARE/OS VERSIONS Linux/KDE Plasma: Fedora Rawhide (available in About System) KDE Plasma Version: 6.0.90 KDE Frameworks Version: 6.2.0 Qt Version: 6.7.1 ADDITIONAL INFORMATION This problem didn't happen when booting Fedora-KDE-Live-x86_64-Rawhide-20240529.n.0.iso in a GNOME Boxes QEMU/KVM VM with 3 GiB RAM, UEFI enabled, and 3D acceleration disabled using the llvmpipe driver.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/5803
Git commit f4f0660dbb50bcb66b37b28f3080c2989257e669 by Xaver Hugl. Committed on 31/05/2024 at 12:11. Pushed by zamundaaa into branch 'master'. opengl/openglcontext: correct the check for buffer storage support M +1 -1 src/opengl/openglcontext.cpp https://invent.kde.org/plasma/kwin/-/commit/f4f0660dbb50bcb66b37b28f3080c2989257e669
Git commit 049d9db87924d104956cfd1c28b311f4d6c9ef8e by Xaver Hugl. Committed on 31/05/2024 at 12:28. Pushed by zamundaaa into branch 'Plasma/6.1'. opengl/openglcontext: correct the check for buffer storage support (cherry picked from commit f4f0660dbb50bcb66b37b28f3080c2989257e669) M +1 -1 src/opengl/openglcontext.cpp https://invent.kde.org/plasma/kwin/-/commit/049d9db87924d104956cfd1c28b311f4d6c9ef8e