Gnome SIGTRAP when a window is moved in the activities view

[Sciencentistguy]

Describe the bug

Gnome SIGTRAPs when a window is dragged around in the activities view

Steps To Reproduce

Steps to reproduce the behavior:

1. run gnome
2. open some windows
3. move them around (perhaps between monitors)
4. ...
5. most of the time (its not 100% consistent) gnome-shell will SIGTRAP and restart

Expected behavior

Not that

Screenshots

If applicable, add screenshots to help explain your problem.

Additional context

The system is "chronos" on this system flake:

Sciencentistguy/nixfiles@2128635

Notify maintainers

@NixOS/gnome

Metadata

Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

[user@system:~]$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 6.1.29, NixOS, 23.11 (Tapir), 23.11.20230525.21eb6c6`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.13.3`
 - channels(root): `""`
 - nixpkgs: `/etc/nix/path/nixpkgs`

[jtojnar]

Do you have any extensions enabled? Is that on X11 or Wayland? Could you please get the output of bt full in coredumpctl gdb $pid with the following installed (where pid is from the output of coredumpctl)?

environment.enableDebugInfo = true;
environment.systemPackages = [
  # Explicitly install to get debug symbols.
  pkgs.gnome.gnome-shell
  pkgs.gnome.mutter
  pkgs.gnome.gnome-session
  pkgs.glib
  pkgs.gjs
  pkgs.spidermonkey_102
];

Do not forget to re-login after switching to that configuration or run coredumpctl with NIX_DEBUG_INFO_DIRS=/run/current-system/sw/lib/debug environment variable, since nixos-rebuild switch cannot update environment variables for running programs.

[Sciencentistguy]

Yes, I use the following extensions:

• blur my shell
• custom hot corners - extended
• hide top bar
  but these worked fine in previous revisions

This is X11 - have an nvidia GPU

Here's the output of bt full:
gdb.txt

[jtojnar]

Interesting. The underlying error is “BadCursor (invalid Cursor parameter)”.

According to https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/411#note_266927, it can happen when you use a custom icon theme that lacks dnd-none icon.

[Sciencentistguy]

I use the paper icon theme, and the MacOSMonterey cursor theme (https://github.com/ful1e5/apple_cursor) (https://github.com/Sciencentistguy/nixfiles/blob/master/packages/apple-cursor-theme/default.nix).

Is that icon a new one for gnome 44?

[jtojnar]

No, the aforementioned issue was already fixed four years ago. Hoping this is another instance of it, you could try patching mutter similarly for the three other occurrences of XFreeCursor:

https://gitlab.gnome.org/search?search=XFreeCursor&nav_source=navbar&project_id=547&group_id=8&search_code=true

[Sciencentistguy]

I've found a fix/workaround: disabling the home-manager gtk module

[jtojnar]

Yeah, that will get rid of the custom cursor theme.

Ideally, it would be fixed on the Mutter side, though.

[Sciencentistguy]

I still have the theme set, just via gnome tweaks rather than through Nix

[koppor]

Also happens here with kind of standard setup. As of today, Gnome doesn't start . I put "gtk = {enable = false};" into home.nix, but did not help.

Update Fix provided at #140505 (comment)