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[Regression][Bisected] EGL/Wayland: QT applications terminated by SIGSEGV (Address boundary error) when using dGPU

System information

  • OS: Arch Linux
  • GPU0 - Integrated: Radeon 680M
  • GPU1 - Dedicated: Radeon RX 7600S
  • Kernel version: v6.8.9-3
  • Mesa version: v24.1-rc3
  • Desktop manager and compositor: Sway w/EGL backend

Describe the issue

When using the dedicated GPU as the primary render (using DRI_PRIME=<pci of dGPU>), launching different QT applications causes a termination by SIGSEGV, f.ex launching OBS:

$ DRI_PRIME=pci-0000_03_00_0 obs # dGPU
> fish: Job 1, 'obs' terminated by signal SIGSEGV (Address boundary error)

$ DRI_PRIME=pci-0000_77_00_0 obs # iGPU
> *Executes as expected*

Changing the QT_QPA_PLATFORM environment variable to force use xcb works as intended, so it seems to be specifically on the Wayland windowing, additionally GTK-based applications works as intended.

Regression

Bisect done between Mesa v24.1-rc2 and v24.1-rc3 on the 24.1 branch: bisect.log

Which points to: f45a1d10 (on 24.1 branch) 066fc39f (on main branch)

Any extra information would be greatly appreciated

QT environment variables in use:

QT_QPA_PLATFORM=wayland;xcb
QT_QPA_PLATFORMTHEME=qt6ct
Edited by Torleif Skår
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