godot: Godot freezes forever on save with small chance on Linux

Godot version

4.0.stable

System information

Ubuntu

Issue description

After 10-30 minutes when i open Godot, Godot freezes forever (buttons don’t work, no button hover animation, can’t close Godot window). Usually it happens when Godot is saving data (scene, script etc.) and after killing process (pkill godot-engine) data is saved, but sometimes it happens when subwindow (like Project settings or Editor settings) is opening and then unsaved data is lost. This bug only on Ubuntu. I tested on same PC on Windows (dualboot) and Godot works good on Windows

Steps to reproduce

Open any project in Godot
Go to Script tab
Press Ctrl + S 5-13 times (tested 2 times, first time 13 saves, second time 5)

Minimal reproduction project

N/A

About this issue

Original URL
State: open
Created a year ago
Reactions: 1
Comments: 23 (12 by maintainers)

Most upvoted comments

In my case, when I press “ctrl + s” and just when it reaches %100 I press again “ctrl + s” it freezes most of the times. I don’t know if this can help to find the cause of the error.

SonGoku-2000 on Oct 18, 2023

Godot doesn’t freeze with KDE UPD: Freezes, but 50-100 times less

werryxgames on Apr 4, 2023

I just got a crash that I’m not sure if it’s related to this, with the following message:

[xcb] Unknown sequence number while processing queue
[xcb] You called XInitThreads, this is not your fault
[xcb] Aborting, sorry about that.
godot.linuxbsd.editor.dev.x86_64.llvm: xcb_io.c:278: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.

Though given the “this is not your fault” message this is probably a bug upstream.

Edit: For reference, this happened here on Godot source: https://github.com/godotengine/godot/blob/79454bfd3b218f5d2b2bb1da2013a3f359615d63/platform/linuxbsd/x11/display_server_x11.cpp#L3671

vnen on Mar 14, 2023

@capnm the crash with “Save as” is unrelated. I reported it here: #74069

vnen on Mar 10, 2023

I get this very often in the following circumstance:

I’m running scons and compiling Godot. My laptop is sweating and heating up, presumably having 3 of its threads busy with the compilation and leaving a single thread to do everything else. (Idk multithreading)
I run some Godot project while the compilation is going on.
Now every time I save, there’s some 20% or so chance it will freeze. But normally, Godot almost never freezes for me.

MewPurPur on Jun 24, 2023

Try to use the latest version (or compile yourself a dev version) and as someone said enable interface/editor/single_window_mode . For me it is now like about 1000x less 😃

capnm on Apr 4, 2023

I think it’s good enough for now, it seems to confirm what @vnen commented in https://github.com/godotengine/godot/issues/74548#issuecomment-1460338268. vnen usually runs debug builds so he might also be able to provide a full stacktrace if needed.

BTW which window manager are you using?

akien-mga on Mar 9, 2023

I just noticed I have the same problem with Alacritty. It freezes randomly and with gdb I was able to see it stops in the same place (xcb_wait_for_event). I wonder if this a bug in libxcb rather than a misusage in Godot.

vnen on Mar 9, 2023