Bug#927831: gnome-shell: keyboard mouse freeze while a bell sound is triggered. Can't even VT-switch. Ruins user-experience.
Ludovic Pouzenc
ludovic at pouzenc.fr
Tue Apr 23 21:48:07 BST 2019
Package: gnome-shell
Version: 3.32.1-1
Severity: important
Dear Maintainer,
With a fresh Debian 10 setup with default wayland gnome-session, or with
a debian 9 with wayland gnome-session, or with gnome-shell-* packages
from experimental, I hit a systematic freeze of all user inputs while a
bell sound is triggered.
It is more than 2.5 seconds if my current pulseaudio default-sink is
over HDMI on nvidia GP106 card (with nouveau + linux-firmware-nonfree).
It is around 250 ms with my home computer motherboard's AMD HDAudio
(lspci 1022:1457). Still ruins user experience if using shell and <tab> key.
I hit this problem also at work on Debian 9 / wayland on at least 4 kind
of desktop computers, 2 with nvidia, 2 with only intel video card,
without any HDMI involved.
Scenario 1 :
In a default Debian buster installation (testing 2019-04-23) with a test
user (named ludovic in traces) with a working sound configuration :
- log in as the test user
- start gnome-terminal
- type some letters that are not a valid shell command prefix (lets says
type "qwert"), see no lags for now
- press tab and right after try to move mouse or typing anything else,
everything is frozen for more than 2 seconds
Scenario 2 :
In a default Debian buster installation (testing 2019-04-23) with a test
user (named ludovic in traces) with a working sound configuration :
- log in as the test user
- start firefox
- browse https://www.debian.org
- hit Ctrl+F to have focus in a search field
- seek a word that in NOT in the page (but have some first letters that
match some words in the page)
(lets say "windows" : "wi" matches "wiki", and I've got a nasty mood ^^)
- you will observe the lag when firefox trigger "no match" system bell
sound after typing n
- the search box forme contains now 71 or 72 "n" :
"winnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnndows"
I think that sound trigger should not be waited in the main event loop.
I think anything should freeze the main event loop more than 100ms.
I think this is fragile or prone to easy DoS that completly freeze the
whole machine ( sh -c "while beep; do : done;" or javascript equivalent ).
I ran reportbug after upgrading to experimental, with no luck. I will
upload all straces I have.
-- System Information:
Debian Release: buster/sid
APT prefers testing
APT policy: (990, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 4.19.0-4-amd64 (SMP w/12 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8),
LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages gnome-shell depends on:
ii dconf-gsettings-backend [gsettings-backend] 0.30.1-2
ii evolution-data-server 3.30.5-1
ii gir1.2-accountsservice-1.0 0.6.45-2
ii gir1.2-atspi-2.0 2.30.0-7
ii gir1.2-freedesktop 1.58.3-2
ii gir1.2-gcr-3 3.28.1-1
ii gir1.2-gdesktopenums-3.0 3.32.0-1
ii gir1.2-gdm-1.0 3.30.2-3
ii gir1.2-geoclue-2.0 2.5.2-1
ii gir1.2-glib-2.0 1.58.3-2
ii gir1.2-gnomebluetooth-1.0 3.28.2-3
ii gir1.2-gnomedesktop-3.0 3.30.2.1-1
ii gir1.2-gtk-3.0 3.24.5-1
ii gir1.2-gweather-3.0 3.28.2-2
ii gir1.2-ibus-1.0 1.5.19-4
ii gir1.2-mutter-4 3.32.1-1
ii gir1.2-nm-1.0 1.14.6-2
ii gir1.2-nma-1.0 1.8.20-1
ii gir1.2-pango-1.0 1.42.4-6
ii gir1.2-polkit-1.0 0.105-25
ii gir1.2-rsvg-2.0 2.44.10-2
ii gir1.2-soup-2.4 2.64.2-2
ii gir1.2-upowerglib-1.0 0.99.10-1
ii gjs 1.54.3-1
ii gnome-backgrounds 3.30.0-1
ii gnome-settings-daemon 3.32.0-1
ii gnome-shell-common 3.32.1-1
ii gsettings-desktop-schemas 3.32.0-1
ii libatk-bridge2.0-0 2.30.0-5
ii libatk1.0-0 2.30.0-2
ii libc6 2.28-8
ii libcairo2 1.16.0-4
ii libcroco3 0.6.12-3
ii libecal-1.2-19 3.30.5-1
ii libedataserver-1.2-23 3.30.5-1
ii libgcr-base-3-1 3.28.1-1
ii libgdk-pixbuf2.0-0 2.38.1+dfsg-1
ii libgirepository-1.0-1 1.58.3-2
ii libgjs0g 1.54.3-1
ii libgles2 1.1.0-1
ii libglib2.0-0 2.58.3-1
ii libglib2.0-bin 2.58.3-1
ii libgstreamer1.0-0 1.14.4-1
ii libgtk-3-0 3.24.5-1
ii libical3 3.0.4-3
ii libmutter-4-0 3.32.1-1
ii libnm0 1.14.6-2
ii libpango-1.0-0 1.42.4-6
ii libpangocairo-1.0-0 1.42.4-6
ii libpolkit-agent-1-0 0.105-25
ii libpolkit-gobject-1-0 0.105-25
ii libpulse-mainloop-glib0 12.2-4
ii libpulse0 12.2-4
ii libsecret-1-0 0.18.7-1
ii libsystemd0 241-3
ii libx11-6 2:1.6.7-1
ii libxfixes3 1:5.0.3-1
ii mutter 3.32.1-1
ii python3 3.7.2-1
Versions of packages gnome-shell recommends:
ii bolt 0.7-2
ii chrome-gnome-shell 10.1-5
ii gdm3 3.30.2-3
ii gkbd-capplet 3.26.1-1
ii gnome-control-center 1:3.30.3-1
ii gnome-user-docs 3.30.2-1
ii ibus 1.5.19-4
ii iio-sensor-proxy 2.4-2
ii switcheroo-control 1.2-2
ii unzip 6.0-22
Versions of packages gnome-shell suggests:
pn gir1.2-telepathyglib-0.12 <none>
pn gir1.2-telepathylogger-0.2 <none>
-- no debconf information
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