[Bug 2034619] Re: [amdgpu] gnome-shell gets SIGKILL'd when lock screen or under heavy load in Wayland

'Invalid' for the kernel. It was always Mutter's fault for using a
realtime thread, and itself not being adequately threaded enough to meet
realtime performance deadlines.

The issue remains open in bug 2077216 and bug 2093179, but a universal
fix is coming in Mutter 48 (Ubuntu 25.04).

** Changed in: linux (Ubuntu)
Status: Triaged => Invalid

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https://bugs.launchpad.net/bugs/2034619

Title:
[amdgpu] gnome-shell gets SIGKILL'd when lock screen or under heavy
load in Wayland

Status in Linux:
New
Status in Mutter:
Fix Released
Status in X.Org X server:
Fix Released
Status in linux package in Ubuntu:
Invalid
Status in mutter package in Ubuntu:
Fix Released
Status in linux source package in Mantic:
Won't Fix
Status in mutter source package in Mantic:
Fix Released

Bug description:
[ Impact ]

gnome-shell gets unceremoniously SIGKILLed on some Ryzen systems,
sometimes when the screen locks, sometimes when launching particular
apps.

[ Workaround ]

Add this to /etc/environment:

  MUTTER_DEBUG_KMS_THREAD_TYPE=user

and then reboot.

[ Test Plan ]

Not all Ryzen systems (including one I just purchased) are able to
reproduce the bug. We have no choice but to leave final verification
to the community. Anyone affected should try locking their screen and
verify they are not instantly returned to the login screen.

[ Where problems could occur ]

Anywhere in frame scheduling and particularly for mouse cursor
movement since that's what the real-time thread exists to optimize.

[ Original Description ]

I have this issue on Ubuntu 23.10. Lock screen works only with an external monitor connected. Otherwise the session is ended and the user is logged out and brought to the gdm screen.
All works in xorg.

ProblemType: Crash
DistroRelease: Ubuntu 23.10
Package: gnome-shell 45~beta.1-0ubuntu2
ProcVersionSignature: Ubuntu 6.3.0-7.7-generic 6.3.5
Uname: Linux 6.3.0-7-generic x86_64
ApportVersion: 2.27.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 6 22:32:22 2023
DisplayManager: gdm3
ExecutablePath: /usr/bin/gnome-shell
InstallationDate: Installed on 2023-09-03 (3 days ago)
InstallationMedia: Ubuntu 23.10 "Mantic Minotaur" - Daily amd64 (20230901.1)
ProcCmdline: /usr/bin/gnome-shell
RelatedPackageVersions: mutter-common 45~beta.1-1ubuntu2
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sudo users
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