[kwin] [Bug 524086] New: kwin_wayland crashes with SIGABRT when activating Desktop Overview on dual monitors (Intel UHD 630)

https://bugs.kde.org/show_bug.cgi?id=524086

            Bug ID: 524086
           Summary: kwin_wayland crashes with SIGABRT when activating
                    Desktop Overview on dual monitors (Intel UHD 630)
    Classification: Plasma
           Product: kwin
      Version First unspecified
       Reported In:
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: compositing
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Created attachment 195023
  --> https://bugs.kde.org/attachment.cgi?id=195023&action=edit
Combined system information and complete crash backtrace for kwin_wayland crash

Steps to reproduce:
1. Connect an external monitor (HDMI) to a laptop with Intel UHD 630.
2. Enable "Desktop Overview" effect in System Settings → Workspace Behavior →
Desktop Effects.
3. Press the Super (Win) key to activate the Overview effect.

Actual result:
KWin crashes immediately with SIGABRT. The screen may freeze briefly, then KWin
restarts, but the Overview effect cannot be used.

Expected result:
The Overview effect should display normally without crashing.

Environment:
- Arch Linux (kernel 7.1.6-arch1-1)
- KDE Plasma 6.7.4, KWin 6.7.4 (Wayland session)
- Intel UHD 630 (i915 driver) + NVIDIA GTX 1060 (Optimus, but crash occurs on
Intel)
- Mesa 26.1.6-arch1.1
- Dual monitors: laptop eDP-1 (1920x1080) + external HDMI-A-3 (1920x1080)

Additional notes:
- Disabling the "Desktop Overview" effect completely avoids the crash.
- The crash is 100% reproducible.
- Full GDB backtrace and system info are attached.

Backtrace highlights (from thread 1):
#0  raise() -> #1 abort() -> #7 libgallium abort -> #12 QRhi::endOffscreenFrame
-> #13 QQuickRenderControl::endFrame -> #14 KWin::OffscreenQuickView::update ->
#15 KWin::QuickSceneEffect::prePaintScreen

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