GNOME Shell complains about accessing disposable objects...

[guihkx]

... in specific scenarios. The error:

Object .Gjs_ui_slider_Slider (0x55ebefb9ad80), has been already disposed — impossible to access it. This might be caused by the object having been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs.
../glib/gobject/gsignal.c:2654: instance '0x55ebefb9ad80' has no handler with id '17472'

To reproduce:

1. Open a terminal window running journalctl -f to monitor errors.
2. Open any app and preferably play a long video or audio (just to keep the same PulseAudio sink active while reproducing this, otherwise you can't trigger it).
3. Disable the extension: gnome-extensions disable [email protected]
4. Enable the extension: gnome-extensions enable [email protected]
5. Move around the volume slider of the app opened in step number 2

Now go back to the terminal window of step 1 and notice the following errors:

Object .Gjs_ui_slider_Slider (0x55bca24aca00), has been already disposed — impossible to access it. This might be caused by the object having been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs.
== Stack trace for context 0x55bca08181f0 ==
#0   55bca644f670 i   resource:///org/gnome/gjs/modules/core/overrides/GObject.js:574 (2b6e2e4bff60 @ 25)
#1   55bca644f5d8 i   resource:///org/gnome/shell/ui/status/volume.js:165 (907f4ce02e0 @ 31)
#2   55bca644f528 i   resource:///org/gnome/shell/ui/status/volume.js:172 (907f4ce0290 @ 106)
#3   7ffdedf76970 b   self-hosted:844 (2b6e2e4af9c0 @ 454)
== Stack trace for context 0x55bca08181f0 ==
#0   55bca644f670 i   resource:///org/gnome/shell/ui/barLevel.js:59 (6d70fad7510 @ 112)
#1   55bca644f5d8 i   resource:///org/gnome/shell/ui/status/volume.js:166 (907f4ce02e0 @ 47)
#2   55bca644f528 i   resource:///org/gnome/shell/ui/status/volume.js:172 (907f4ce0290 @ 106)
#3   7ffdedf76970 b   self-hosted:844 (2b6e2e4af9c0 @ 454)
== Stack trace for context 0x55bca08181f0 ==
#0   55bca644f670 i   resource:///org/gnome/shell/ui/barLevel.js:60 (6d70fad7510 @ 127)
#1   55bca644f5d8 i   resource:///org/gnome/shell/ui/status/volume.js:166 (907f4ce02e0 @ 47)
#2   55bca644f528 i   resource:///org/gnome/shell/ui/status/volume.js:172 (907f4ce0290 @ 106)
#3   7ffdedf76970 b   self-hosted:844 (2b6e2e4af9c0 @ 454)
== Stack trace for context 0x55bca08181f0 ==
#0   55bca644f670 i   resource:///org/gnome/gjs/modules/core/overrides/GObject.js:577 (2b6e2e4bff10 @ 25)
#1   55bca644f5d8 i   resource:///org/gnome/shell/ui/status/volume.js:167 (907f4ce02e0 @ 78)
#2   55bca644f528 i   resource:///org/gnome/shell/ui/status/volume.js:172 (907f4ce0290 @ 106)
#3   7ffdedf76970 b   self-hosted:844 (2b6e2e4af9c0 @ 454)
../glib/gobject/gsignal.c:2654: instance '0x55bca24aca00' has no handler with id '48653'
== Stack trace for context 0x55bca08181f0 ==
#0   55bca644f670 i   resource:///org/gnome/gjs/modules/core/overrides/GObject.js:574 (2b6e2e4bff60 @ 25)
#1   55bca644f5d8 i   resource:///org/gnome/shell/ui/status/volume.js:165 (907f4ce02e0 @ 31)
#2   55bca644f528 i   resource:///org/gnome/shell/ui/status/volume.js:172 (907f4ce0290 @ 106)
#3   7ffdedf76db0 b   self-hosted:844 (2b6e2e4af9c0 @ 454)
== Stack trace for context 0x55bca08181f0 ==
#0   55bca644f670 i   resource:///org/gnome/gjs/modules/core/overrides/GObject.js:577 (2b6e2e4bff10 @ 25)
#1   55bca644f5d8 i   resource:///org/gnome/shell/ui/status/volume.js:167 (907f4ce02e0 @ 78)
#2   55bca644f528 i   resource:///org/gnome/shell/ui/status/volume.js:172 (907f4ce0290 @ 106)
#3   7ffdedf76db0 b   self-hosted:844 (2b6e2e4af9c0 @ 454)
Object .Gjs_ui_slider_Slider (0x55bca24aca00), has been already disposed — impossible to access it. This might be caused by the object having been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs.
Object .Gjs_ui_slider_Slider (0x55bca24aca00), has been already disposed — impossible to access it. This might be caused by the object having been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs.
clutter_content_invalidate: assertion 'CLUTTER_IS_CONTENT (content)' failed
Object .Gjs_ui_slider_Slider (0x55bca24aca00), has been already disposed — impossible to access it. This might be caused by the object having been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs.
../glib/gobject/gsignal.c:2696: instance '0x55bca24aca00' has no handler with id '48653'
Object .Gjs_ui_slider_Slider (0x55bca24aca00), has been already disposed — impossible to access it. This might be caused by the object having been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs.
../glib/gobject/gsignal.c:2654: instance '0x55bca24aca00' has no handler with id '48653'
Object .Gjs_ui_slider_Slider (0x55bca24aca00), has been already disposed — impossible to access it. This might be caused by the object having been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs.
../glib/gobject/gsignal.c:2696: instance '0x55bca24aca00' has no handler with id '48653'

• OS: Arch Linux
• GNOME: 41.3 (X11)

[guihkx]

I noticed this behavior after a session unlock, because GNOME disables all extensions when you lock the session and re-enables them when you unlock it. So, that's why in the reproduction steps you have to disable it temporarily.

And because I have a persistent audio sink (Music Player Daemon), every time I'd move the volume slider, I'd notice a bunch of errors in the journal.