Bug 487777

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.