cosmic-store + Pop Shell tiling causes gnome-shell log spam and UI freeze

[GhostInZshell]

GNOME Shell log storm + freeze when opening cosmic-store with Pop Shell tiling enabled (syslog grows to 24GB)

Summary

Opening cosmic-store while Pop Shell tiling is enabled triggers a GNOME Shell warning loop (Attempting to run a JS callback during garbage collection… SourceFunc()), causing rsyslog to write continuously and /var/log/syslog to explode (24GB), which fills / and hard-freezes the desktop (mouse moves but clicks stop responding).

Repro steps

• Boot and log into GNOME on X11 (Pop!_OS 22.04).
• Ensure Pop Shell tiling is enabled.
• Launch cosmic-store.
• Within moments, GNOME Shell begins spamming the warning below at extremely high rate.
• Desktop becomes unresponsive; / usage grows rapidly; /var/log/syslog grows to tens of GB.

Repro rate: happened 2/2 times so far

Expected

cosmic-store opens normally; no freeze; no runaway logging.

Actual

• GNOME Shell spams warnings at very high rate:

Attempting to run a JS callback during garbage collection...
The offending callback was SourceFunc().

• rsyslog writes continuously (observed ~1.7MB/s earlier).
• /var/log/syslog grows rapidly (reached 24GB; currently still multi-GB).
• Desktop freezes: mouse moves but cannot click/interact.

Environment

OS / Kernel

• Pop!_OS 22.04 LTS (jammy)
• Linux 6.17.4-76061704-generic
• XDG_SESSION_TYPE=x11
• GNOME Shell 42.9

Enabled extensions

cosmic-dock@system76.com
cosmic-workspaces@system76.com
ding@rastersoft.com
pop-cosmic@system76.com
pop-shell@system76.com
popx11gestures@system76.com
system76-power@system76.com
ubuntu-appindicators@ubuntu.com

Extension info

pop-shell@system76.com Version: 2 State: ENABLED
pop-cosmic@system76.com Version: 1 State: ENABLED
cosmic-dock@system76.com Version: 71 State: ENABLED

Relevant package versions

cosmic-store 0.1.0~1766011664~22.04~a31253a
pop-shell 1.1.0~1735556688~22.04~0f7a5d1
gnome-shell 42.9-0ubuntu2.3pop0~1745963094~22.04~af56e4e
mutter (libmutter-10-0) 42.9-0ubuntu9pop0~1727960749~22.04~a024e16
rsyslog 8.2112.0-2ubuntu2.2

Logs (excerpt)

From the incident window:

Dec 23 13:14:51.451684 gnome-shell[3990]: The offending callback was SourceFunc().
Dec 23 13:14:51.451694 gnome-shell[3990]: 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.
Dec 23 13:14:51.451697 gnome-shell[3990]: The offending callback was SourceFunc().
Dec 23 13:14:51.451709 gnome-shell[3990]: Attempting to run a JS callback during garbage collection...
... (repeats extremely rapidly)

Current syslog sizes:

-rw-r----- 1 syslog adm  3.3G Dec 23 13:28 /var/log/syslog
-rw-r----- 1 syslog adm  1.9M Dec 21 00:00 /var/log/syslog.1
...

Recovery / workaround used

• Switched to TTY (Ctrl+Alt+F3), observed / filling and rsyslog heavy writes.
• sudo systemctl stop rsyslog
• sudo truncate -s 0 /var/log/syslog (and removed rotated syslog/kern.log files)
• Restarted display manager / disabled extensions to stop the loop and regain a usable session.

Notes

This appears tied to Pop Shell tiling + cosmic-store window lifecycle, since it happens immediately after launching cosmic-store with tiling enabled.