wayland crash when changing waveform prefs in latest main

[ywwg]

Bug Description

Ubuntu 24.04, QT6/no QML/Open GL On. when changing waveform preferences, the screen locks and then wayland crashes. nothing useful in logs

Version

HEAD

OS

Ubuntu 24.04

[ywwg]

This is a Dell XPS 13, 4.6 (Compatibility Profile) Mesa 24.0.5-1ubuntu1 (Mesa Intel(R) Xe Graphics (TGL GT2))

no issues under xorg

[ywwg]

looks like gnome shell crashed:

2024-07-14T14:19:12.139947-04:00 glacier gnome-shell[8178]: Errors from xkbcomp are not fatal to the X server
2024-07-14T14:19:13.076200-04:00 glacier gnome-shell[4289]: JS ERROR: TypeError: this._container is undefined#012_setCustomStyle@file:///home/owen/.local/share/gnome-shell/extensions/workspace-switcher-manager@G-dH
.github.com/extension.js:428:32#012display@file:///home/owen/.local/share/gnome-shell/extensions/workspace-switcher-manager@G-dH.github.com/extension.js:343:14#012_showWorkspaceSwitcher@resource:///org/gnome/shell/
ui/windowManager.js:1840:42#012@resource:///org/gnome/shell/ui/init.js:21:20
2024-07-14T14:19:14.776151-04:00 glacier tracker-miner-f[4820]: WARNING: Available disk space (1.292136%) is below configured threshold for acceptable working (5%)
2024-07-14T14:19:14.863498-04:00 glacier gnome-shell[4289]: meta_window_set_stack_position_no_sync: assertion 'window->stack_position >= 0' failed
2024-07-14T14:19:18.835709-04:00 glacier gnome-shell[4289]: g_object_ref: assertion 'G_IS_OBJECT (object)' failed
2024-07-14T14:19:18.835794-04:00 glacier gnome-shell[4289]: GNOME Shell crashed with signal 11
2024-07-14T14:19:18.835809-04:00 glacier gnome-shell[4289]: == Stack trace for context 0x5ba9ee385240 ==
2024-07-14T14:19:18.835819-04:00 glacier gnome-shell[4289]: #0   5ba9ee451c98 i   resource:///org/gnome/shell/ui/init.js:21 (272755b70bf0 @ 48)
2024-07-14T14:19:19.939968-04:00 glacier evolution-alarm[4544]: Error reading events from display: Broken pipe
2024-07-14T14:19:19.940239-04:00 glacier xdg-desktop-por[4821]: Error reading events from display: Broken pipe
2024-07-14T14:19:19.940371-04:00 glacier gsd-power[4444]: Error reading events from display: Broken pipe
2024-07-14T14:19:19.940480-04:00 glacier xdg-desktop-por[5075]: Error reading events from display: Broken pipe
2024-07-14T14:19:19.940593-04:00 glacier gnome-software[4502]: Error reading events from display: Broken pipe
2024-07-14T14:19:19.940725-04:00 glacier gsd-color[4421]: Error reading events from display: Broken pipe
2024-07-14T14:19:19.940868-04:00 glacier gsd-keyboard[4437]: Error reading events from display: Broken pipe
2024-07-14T14:19:19.940987-04:00 glacier update-notifier[5602]: Error reading events from display: Broken pipe
2024-07-14T14:19:19.941102-04:00 glacier gsd-wacom[4480]: Error reading events from display: Broken pipe
2024-07-14T14:19:19.957923-04:00 glacier firefox_firefox.desktop[6071]: ExceptionHandler::GenerateDump attempting to generate:
2024-07-14T14:19:19.957996-04:00 glacier firefox_firefox.desktop[6071]: /home/owen/snap/firefox/common/.mozilla/firefox/4mcetjfk.c_mode/minidumps/14ae8b91-3ded-bd2f-a3d1-723fb6ed4c6c.dmp
2024-07-14T14:19:19.958140-04:00 glacier gnome-terminal-[5704]: Error reading events from display: Broken pipe
2024-07-14T14:19:19.958286-04:00 glacier gnome-shell[4724]: (EE) failed to read Wayland events: Broken pipe
2024-07-14T14:19:19.958628-04:00 glacier [5012]: Error reading events from display: Broken pipe
2024-07-14T14:19:19.958783-04:00 glacier dropbox[4681]: Error reading events from display: Broken pipe
2024-07-14T14:19:19.958910-04:00 glacier systemd[3535]: org.gnome.Shell@wayland.service: Main process exited, code=dumped, status=11/SEGV

[Swiftb0y]

Can you try recovering the full stacktrace? The syslog only contains the bottom most stackframe afaict.
I remember suffering from https://gitlab.gnome.org/GNOME/mutter/-/issues/3462 some time ago. Does that match your stacktrace? What mutter version are you using?

[Swiftb0y]

Again, shot in the dark, but the stacktrace might be originating from the workspace-switcher-manager extension. Maybe disable that first?

[ywwg]

Something else weird, under xorg I get half a waveform:

I'll try disabling the extensions

[ywwg]

oh weird the waveform is misaligned under high detail mode as well. strange. (the beatgrid is correct but looks wrong here)

I'll do a bisect

[ywwg]

@acolombier 's fix fixed the half-waveform issue, but I still get the crash on preference change. I'll try some more debugging.

mutter version looks to be 46.0-1ubuntu9

[ywwg]

I got a backtrace from gnome-shell, this looks like https://gitlab.gnome.org/GNOME/mutter/-/issues/3462 which is fixed upstream https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3725.

[Swiftb0y]

good to know. I suffered from the same previously, thankfully fedora had already pulled in the fix back then and I just had to dnf upgrade ;)...

[acolombier]

Nice to hear! Shall we close this issue?

[ywwg]

Would it be ok to leave this open until Ubuntu releases a fix? In case other people come across the problem