https://bugs.kde.org/show_bug.cgi?id=514418
Bug ID: 514418
Summary: KWin Wayland Segmentation Fault on USB-C Dock Unplug
Classification: Plasma
Product: kwin
Version First 6.3.6
Reported In:
Platform: Debian unstable
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 188395
--> https://bugs.kde.org/attachment.cgi?id=188395&action=edit
Patch
Bug Report: KWin Wayland Segmentation Fault on USB-C Dock Unplug
Product: KWin
Component: wayland-generic
Summary: KWin crashes with SIGSEGV when unplugging a USB-C dock in Wayland
session.
Description:
KWin crashes with a segmentation fault when unplugging a USB-C dock from the
laptop. This occurs consistently during hot-unplug events. The crash happens in
the color management protocol handling, specifically in
wp_color_manager_v1_get_output when attempting to access a removed output
resource.
Steps to Reproduce:
1. Connect a USB-C dock with displays to the laptop.
2. Log in to a Wayland Plasma session.
3. Unplug the USB-C dock.
4. KWin crashes with SIGSEGV.
Expected Behavior:
Unplugging the dock should not cause a crash; the system should handle
hot-unplug gracefully.
Actual Behavior:
KWin crashes, requiring a session restart.
System Information:
Operating System: Debian Trixie (unstable)
Kernel Version: 6.12.57+deb13-amd64
Architecture: x86_64
Graphics Driver: Mesa 25.0.7-2
KWin Version: 6.3.7
Qt Version: 6.x
Wayland Server Library: libwayland-server.so.0
Additional Notes:
- Crash log attached (crash.log).
- Proposed fix: Add validity check for output in
ColorManagerV1::wp_color_manager_v1_get_output to prevent access to removed
outputs.
- Patch attached (patch.diff).
- System info attached (system_info.txt).
- Similar issues: Related to bugs 446124, 448778, 511632 (crashes on unplug,
but different stack traces).
Attachments:
- crash.log: Full crash backtrace.
- patch.diff: Git diff for the proposed fix.
- system_info.txt: Detailed system information.
Submit to:
https://bugs.kde.org/enter_bug.cgi?product=kwin&component=wayland-generic
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