Public bug reported:
On my Ubuntu 20.04.3 LTS, I have reproducible freezes of gdm3
(3.36.3-0ubuntu0.20.04.4) caused by third-party applications. The only thing I
found describing my problem was https://unix.stackexchange.com/a/39855 (passage
*GUI Glitches Causing Unresponsive WM or X11/Wayland*). This is exactly my
experience ("**an application stops responding and prevents you from entering
input with the keyboard or mouse to other application windows**"). Specifically:
- clicking on a hyperlink in (an open mail in) thunderbird freezes gdm3 at 90%.
- opening files via nemo (file manager) freezes gdm3 sometimes, regardless
which file type.
- libreoffice freezes gdm3 a lot when switching windows via alt-tab, but not
when I switch windows via super key.
Whenever a freeze occurs, the clock in my taskbar stops, the mouse and
keyboard still work, but no window responds. Switching to tty works.
Killing the last used application (e.g. thunderbird, nemo, soffice.bin)
via tty brings gdm3 to life again. The funny thing is that when e.g. I
open a link via thunderbird and gdm3 freezes, then I kill thunderbird
via tty and switch back to X, then thunderbird is gone but firefox has
opened the link.
I activated gdm3 debug output but could not find anything (I'm not an
ubuntu/X/gdm expert).
One freeze occurs somewhere between two **systemd-logind: got pause for 13:73**
in syslog_gdm3.log
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gdm3 3.36.3-0ubuntu0.20.04.4
ProcVersionSignature: Ubuntu 5.4.0-81.91-generic 5.4.128
Uname: Linux 5.4.0-81-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Sep 2 12:23:57 2021
InstallationDate: Installed on 2018-07-26 (1134 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
LANGUAGE=de_CH:de
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=de_CH.UTF-8
SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: Upgraded to focal on 2020-10-07 (329 days ago)
mtime.conffile..etc.gdm3.custom.conf: 2021-09-02T11:47:52.516792
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
** Attachment added: "syslog_gdm3.log"
https://bugs.launchpad.net/bugs/1942432/+attachment/5522527/+files/syslog_gdm3.log
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https://bugs.launchpad.net/bugs/1942432
Title:
third-party applications freeze gdm3 reproducibly
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