Public bug reported:
GNOME Shell crashes when moving windows between monitors in a multi-
display setup.
System:
- Ubuntu 26.04 LTS
- GNOME Shell 50.1 (Ubuntu build)
- Mutter 50.1
- Intel + NVIDIA hybrid graphics
- Wayland session
Issue:
GNOME Shell becomes unstable and crashes (SIGSEGV in g_hash_table_remove /
Mutter) when dragging windows (Chrome, etc.) between monitors or during window
snapping operations.
Previously installed extension:
- Ubuntu Tiling Assistant (version 54)
- Was ACTIVE during original crashes
Observed stack traces:
- libmutter-18.so
- libgjs
- moveHandler.js / tilingWindowManager.js
- "Trying to operate on an unmanaging window"
- "Extension point conflict: tiling-assistant@leleat-on-github"
Current state:
After disabling Tiling Assistant extension, system appears stable and no longer
crashes during window movement.
Reproducibility:
Previously reproducible 100% when dragging windows between monitors.
Usefull info:
00:02.0 VGA compatible controller: Intel Corporation Raptor Lake-S UHD Graphics
(rev 04)
DeviceName: Onboard - Video
Subsystem: ASUSTeK Computer Inc. Device 1204
Kernel driver in use: i915
--
01:00.0 VGA compatible controller: NVIDIA Corporation GB206M [GeForce RTX 5070
Max-Q / Mobile] (rev a1)
Subsystem: ASUSTeK Computer Inc. Device 1204
Kernel driver in use: nvidia
Kernel modules: nvidiafb, nouveau, nova_core, nvidia_drm, nvidia
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: gnome-shell 50.1-0ubuntu1
ProcVersionSignature: Ubuntu 7.0.0-22.22-generic 7.0.0
Uname: Linux 7.0.0-22-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Jun 4 10:36:18 2026
DisplayManager: gdm3
InstallationDate: Installed on 2026-05-24 (11 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
ProcEnviron:
LANG=es_ES.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
RelatedPackageVersions: mutter-common 50.1-0ubuntu2.1
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2155232
Title:
GNOME Shell crashes when moving windows between monitors in a multi-
display setup.
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