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Since I've upgraded to Groovy, my window manager repeatedly crashes. I've found a simple and reliable way to repeat the crash, so here it is :

  1. Install the qemu-system-x86 package
  2. Run the following command : qemu-system-x86_64 -nodefaults -display gtk -device VGA -full-screen

... and GNOME Shell crashes. You can see the screen blink, that's the crash. All windows that were previously minimised will be raised again. To quit Qemu full screen, type Ctrl+Alt+F.

Here's the part of the log that I think is relevant :

Dec 03 20:51:26 NovHak-P2 gnome-shell[13840]: JS ERROR: TypeError: actor.__animationInfo is undefined
                                              _sizeChangedWindow@resource:///org/gnome/shell/ui/windowManager.js:1385:9
Dec 03 20:51:26 NovHak-P2 gnome-shell[13840]: Error in freeze/thaw accounting
Dec 03 20:51:26 NovHak-P2 gnome-shell[13840]: GNOME Shell crashed with signal 5
Dec 03 20:51:26 NovHak-P2 gnome-shell[13840]: == Stack trace for context 0x55ba9a140220 ==
Dec 03 20:51:26 NovHak-P2 systemd[11078]: org.gnome.Shell@x11.service: Main process exited, code=dumped, status=5/TRAP
Dec 03 20:51:26 NovHak-P2 systemd[11078]: org.gnome.Shell@x11.service: Failed with result 'core-dump'.
Dec 03 20:51:26 NovHak-P2 systemd[11078]: org.gnome.Shell@x11.service: Scheduled restart job, restart counter is at 4.
Dec 03 20:51:26 NovHak-P2 systemd[11078]: Stopped GNOME Shell on X11.
Dec 03 20:51:26 NovHak-P2 systemd[11078]: Starting GNOME Shell on X11...

The first two lines are probably the most informative. I suspect it affects almost all systems, can anyone confirm ?

Besides those crashes, I noticed another annoying thing, when I play a game full screen (namely DCSS, apt install crawl-tiles), when I come back to the desktop, the time showed in the upper bar isn't current, it's the time when I started playing. Moving the cursor on the time has it updated to current. I have the feeling it is related to the crashes somehow...

(While playing, the text in the DCSS log has strange artifacts, I suspect it's related too, but maybe that's a DCSS problem after all)

Any suggestions on how to avoid those crashes ?

EDIT : While it's an already reported bug, it would still be interesting if someone finds a workaround during the (long ?) time until the fix reaches us. Apart from leaving Gnome 3 that is (which I'm considering more and more btw, with those impractical design choices that are definitely not improving, but that's another mutter... eeeh matter).

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  • Great troubleshooting! This looks like a real, reportable bug. Discussion about it should take place in the bug report, not in AskUbuntu,.
    – user535733
    Dec 3, 2020 at 20:43
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    @user535733 I just discovered it's already been reported ! bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1897765 Unfortunately, the fix takes time to come...
    – NovHak
    Dec 3, 2020 at 20:49
  • @KGIII Wait, I posted it as I'm looking for a workaround ! Hence not only a bug report (have a look at my edit)
    – NovHak
    Dec 3, 2020 at 20:56
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    I'll retract the flag (I didn't vote). Good choice to edit it to make it clear. Others may also think it's a bug report, but hopefully they'll see this discourse.
    – KGIII
    Dec 3, 2020 at 20:58

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