[kde] [Bug 500094] New: KWin crashes when connecting external display via DisplayPort via dock

[Niko Strijbol]

https://bugs.kde.org/show_bug.cgi?id=500094

            Bug ID: 500094
           Summary: KWin crashes when connecting external display via
                    DisplayPort via dock
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: NixOS
                OS: Linux
            Status: REPORTED
          Keywords: drkonqi
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: strijbol.niko at gmail.com
  Target Milestone: ---

Application:  (6.3.0)

ApplicationNotResponding [ANR]: false
Qt Version: 6.8.2
Frameworks Version: 6.10.0
Operating System: Linux 6.13.2 x86_64
Windowing System: Wayland
Distribution: NixOS 25.05 (Warbler)
DrKonqi: 6.3.0 [CoredumpBackend]

-- Information about the crash:
When connecting an external display via my Dell dock (a WD19TBS) via the
DisplayPort connector, KWin crashes.

In the following cases, everything works fine:
- The same setup with Plasma 6.2.5 works fine
- The same dock with a screen connected via HDMI works fine
- The same screen connected directly to the laptop (with usb-c) works fine

I have reverted for now, but I can fairly easily switch back if more logs or
diagnostics are required.

The crash can be reproduced every time.

-- Backtrace (Reduced):
#5  KWin::DrmProperty::isValid (this=0x108) at
/build/kwin-6.3.0/src/backends/drm/drm_property.cpp:153
#6  0x00007f728b7c38be in KWin::DrmPipeline::prepareAtomicPresentation
(this=this at entry=0x7f7264006410, commit=commit at entry=0x7f72640031f0,
frame=std::shared_ptr<KWin::OutputFrame> (use count 1, weak count 0) = {...})
at /build/kwin-6.3.0/src/backends/drm/drm_pipeline.cpp:182
#7  0x00007f728b7c853d in KWin::DrmPipeline::present (this=0x7f7264006410,
frame=std::shared_ptr<KWin::OutputFrame> (use count 1, weak count 0) = {...})
at
/nix/store/zs2gq6fkglrd28g1nxlb8waqq37cdc2z-gcc-14-20241116/include/c++/14-20241116/bits/unique_ptr.h:193
#8  0x00007f728b7bcb3e in KWin::DrmOutput::present (this=0x3e1773e0,
frame=std::shared_ptr<KWin::OutputFrame> (use count 1, weak count 0) = {...})
at /build/kwin-6.3.0/src/backends/drm/drm_output.cpp:325
#9  0x00007f728b420294 in KWin::WaylandCompositor::composite (this=0x3c01caf0,
renderLoop=<optimized out>) at /build/kwin-6.3.0/src/compositor_wayland.cpp:436


Reported using DrKonqi

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