With gnome-shell 3.36.9-0ubuntu0.20.04.2 I too see this with only the
built-in "Desktop Icons", "Ubuntu AppIndicators", "Ubuntu Dock"
extensions and no further extensions in ~/.local/share/gnome-shell/
$ journalctl -S -1hour | grep 'Jan 07 08:19:35' | sort | uniq -c
Hint: You are currently not seeing messages from other users and the system.
Users in groups 'adm', 'systemd-journal' can see all messages.
Pass -q to turn off this notice.
22 Jan 07 08:19:35 LAP125300 gnome-shell[3286]: Attempting to call back
into JSAPI during the sweeping phase of GC. This is most likely caused by not
destroying a Clutter actor or Gtk+ widget with ::destroy signals connected, but
can also be caused by using the destroy(), dispose(), or remove() vfuncs.
Because it would crash the application, it has been blocked and the JS callback
not invoked.
4314 Jan 07 08:19:35 LAP125300 gnome-shell[3286]: Attempting to run a JS
callback during garbage collection. This is most likely caused by destroying a
Clutter actor or GTK widget with ::destroy signal connected, or using the
destroy(), dispose(), or remove() vfuncs. Because it would crash the
application, it has been blocked.
22 Jan 07 08:19:35 LAP125300 gnome-shell[3286]: The offending callback was
paint(), a vfunc.
4291 Jan 07 08:19:35 LAP125300 gnome-shell[3286]: The offending callback was
SourceFunc().
22 Jan 07 08:19:35 LAP125300 gnome-shell[3286]: The offending signal was
paint on Gjs_ubuntu-dock_ubuntu_com_docking_DashToDock 0x5581d33fc7d0.
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1908429
Title:
gnome-shell fills syslog: Attempting to run a JS callback during
garbage collection. This is most likely caused by destroying a Clutter
actor or GTK widget with ::destroy signal connected, or using the
destroy(), dispose(), or remove() vfuncs. Because it would crash the
application, it has been blocked. The offending callback was
SourceFunc().
To manage notifications about this bug go to:
https://bugs.launchpad.net/gnome-shell/+bug/1908429/+subscriptions
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