gnome-shell spams journal with `g_closure_add_invalidate_notifier: assertion 'closure->n_inotifiers < CLOSURE_MAX_N_INOTIFIERS' failed` when 'Zoom' a11y feature enabled

[Julian Andres Klode]

gnome-shell logs

gnome-shell[4537]: g_closure_add_invalidate_notifier: assertion 'closure->n_inotifiers < CLOSURE_MAX_N_INOTIFIERS' failed

multiple times per second for weeks now.

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: gnome-shell 44.3-1ubuntu1
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: pass
CurrentDesktop: GNOME
Date: Thu Aug 10 10:38:23 2023
DisplayManager: gdm3
InstallationDate: Installed on 2022-11-26 (256 days ago)
InstallationMedia: Ubuntu 23.04 "Lunar Lobster" - Alpha amd64 (20221126)
RelatedPackageVersions: mutter-common 44.3-1ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Thanks for the bug report. This looks like a leak. Since I can't find any other reports of this in Ubuntu or upstream yet, please try disabling all extensions and then log in again.

[Julian Andres Klode (juliank)]

The only extension enabled is Ubuntu App Indicators, fwiw.

[Daniel van Vugt (vanvugt)]

Oh right, sorry. Your gsettings are just showing older ones still:

b'org.gnome.shell' b'enabled-extensions' b"['<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>']"

But I can see the log only mentions default Ubuntu extensions.

[Daniel van Vugt (vanvugt)]

I can't find g_closure_add_invalidate_notifier used in any extensions, or gnome-shell, or mutter :(

[Daniel van Vugt (vanvugt)]

gjs looks like the only user of g_closure_add_invalidate_notifier in gnome-shell. Aside from glib itself.

[Julian Andres Klode (juliank)]

Also Ubuntu AppIndicators wasn't at fault anyway, I used the "disable extensions" toggle and it still happens.

[Daniel van Vugt (vanvugt)]

Disabling is voluntary so buggy extensions might still do bad things when disabled.

[Julian Andres Klode (juliank)]

OK so this turns out to be an issue of the 'Zoom' accessibility feature being enabled (but not actively zooming).

[Kir Kolyshkin (kolyshkin)]

I am having the very same issue for quite some time, and can confirm that disabling Zoom (via Settings -> Accessibility -> Zoom, then uncheck "Desktop Zoom") fixes it. Too bad now I have exactly 1040682 log lines (after removing most of logs) on my SSD. For the reference, here's the first and the last one:

Aug 15 13:46:50 kir-rhat gnome-shell[2571]: g_closure_add_invalidate_notifier: assertion 'closure->n_inotifiers < CLOSURE_MAX_N_INOTIFIERS' failed
....
Nov 03 15:25:44 kir-rhat gnome-shell[2616]: g_closure_add_invalidate_notifier: assertion 'closure->n_inotifiers < CLOSURE_MAX_N_INOTIFIERS' failed

Version info:
$ rpm -q gnome-shell
gnome-shell-44.5-1.fc38.x86_64

[Julian Andres Klode (juliank)]

Kir, this is the Ubuntu bug tracker, not the Fedora one.

[Kir Kolyshkin (kolyshkin)]

Julian, you are right, but apparently this is a bug in Gnome shell, which manifests itself equally in Ubuntu and Fedora.

I have just reported it upstream: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/7189

[corrado venturini (corradoventu)]

Same on Ubuntu 24.04
corrado@corrado-n9-nn-1210:~$ apt policy gnome-shell
gnome-shell:
  Installed: 45.2-1ubuntu1
  Candidate: 45.2-1ubuntu1
  Version table:
 *** 45.2-1ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu noble/main amd64 Packages
        100 /var/lib/dpkg/status
corrado@corrado-n9-nn-1210:~$

Jan 09 18:38:02 corrado-n9-nn-1210 gnome-shell[2134]: g_closure_add_invalidate_notifier: assertion 'closure->n_inotifiers < CLOSURE_MAX_N_INOTIFIERS' failed
Jan 09 18:38:02 corrado-n9-nn-1210 gnome-shell[2134]: g_closure_add_invalidate_notifier: assertion 'closure->n_inotifiers < CLOSURE_MAX_N_INOTIFIERS' failed
Jan 09 18:38:02 corrado-n9-nn-1210 gnome-shell[2134]: g_closure_add_invalidate_notifier: assertion 'closure->n_inotifiers < CLOSURE_MAX_N_INOTIFIERS' failed