Sharing debug details from jamesh
When starting snap applications via the shell, log messages like the following
are produced:
Mar 21 18:07:49 MGLT-Ubuntu chromium_chromium.desktop[13099]:
/user.slice/user-1000.slice/[email protected]/app.slice/app-gnome-chromium_chromium-13099.scope
is not a snap cgroup
This error is triggered in snapd’s device-cgroup-support.c, where it
expects the process to be in a cgroup created by snapd but finds it in
an app-gnome-*.scope cgroup instead. I think this is down to a race
condition between gnome-shell and snapd.
On the gnome-shell side, it’s doing:
spawns the app via GLib.spawn_async, which returns the pid of the
running child process.
Calls GnomeDesktop.start_systemd_scope on the pid.
start_systemd_scope calls the systemd StartTransientUnit D-Bus
method to move the pid to the app-gnome-*.scope cgroup.
On the snap side:
the executables in /snap/bin are equivalent to running snap run
snapname.
the snap run code asks systemd to move its own pid to a snap.*.scope
cgroup via StartTransientUnit.
it then execs /usr/lib/snapd/snap-confine to set up the sandbox.
This includes the device-cgroup-support.c code with the cgroup check.
if it could set up the sandbox correctly, snap-confine execs the
sandboxed application.
I think the problem occurs if gnome-shell’s StartTransientUnit call
occurs between steps (2) and (3) on the snap side.
** Changed in: snapd (Ubuntu)
Importance: Undecided => High
** Also affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Changed in: gnome-shell (Ubuntu)
Importance: Undecided => Critical
** Tags added: rls-ll-incoming
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https://bugs.launchpad.net/bugs/2011806
Title:
[lunar] Snaps don't launch due to cgroup issue
Status in gnome-shell package in Ubuntu:
New
Status in snapd package in Ubuntu:
Confirmed
Bug description:
Hi,
Lunar up to date, Intel+Nvidia GPUs, Ubuntu Wayland or X11 session,
hybrid or discrete graphics.
If I click on a snap dash icon, nothing happens.
Tested with Thunderbird, Firefox, Shortwave...
(VS Code seems ok, maybe due to classic confinment?)
I can launch without issue Chrome (deb), Synaptic, GNOME apps, etc.
Recent updates included gnome-shell and libadwaita.
---
I get this type of log for all problematic snaps:
/user.slice/user-1000.slice/[email protected]/app.slice/app-gnome-
shortwave_shortwave-11885.scope is not a snap cgroup
---
Context:
$ snap --version
snap 2.58.3+23.04ubuntu1
snapd 2.58.3+23.04ubuntu1
series 16
ubuntu 23.04
kernel 6.1.0-16-generic
$ snap list
Nom Version Révision
Suivi Éditeur Notes
bare 1.0 5
latest/stable canonical✓ base
code ee2b180d 122
latest/stable vscode✓ classic
core 16-2.58.2 14784
latest/stable canonical✓ core
core18 20230308 2714
latest/stable canonical✓ base
core20 20230207 1828
latest/stable canonical✓ base
core22 20230210 522
latest/stable canonical✓ base
firefox 111.0-2 2432
latest/candidate mozilla✓ -
gimp 2.10.30 393
latest/stable snapcrafters -
gnome-3-28-1804 3.28.0-19-g98f9e67.98f9e67 161
latest/stable canonical✓ -
gnome-3-38-2004 0+git.6f39565 119
latest/stable canonical✓ -
gnome-42-2204 0+git.09673a5 65
latest/stable canonical✓ -
gtk-common-themes 0.1-81-g442e511 1535
latest/stable/… canonical✓ -
gtk-theme-pocillo 0.14.4.1 5
latest/stable ubuntubudgie -
gtk-theme-qogirbudgie 22.04.1 8
latest/stable ubuntubudgie -
gtk2-common-themes 0.1 13
latest/stable canonical✓ -
hunspell-dictionaries-1-7-2004 1.7-20.04+pkg-6fd6 2
latest/stable brlin -
kde-frameworks-5-91-qt-5-15-3-core20 5.91.0 1
latest/stable kde✓ -
kde-frameworks-5-99-qt-5-15-7-core20 5.99.0 15
latest/stable kde✓ -
kde-frameworks-5-core18 5.67.0 35
latest/stable kde✓ -
libreoffice 7.5.1.2 270
latest/stable canonical✓ -
shortwave 3.0.0 79
latest/stable alexmurray✪ -
snapd 2.58.2 18357
latest/stable canonical✓ snapd
snapd-desktop-integration 0.1 71
latest/stable/… canonical✓ -
stellarium-daily v1.2 1396
latest/stable t4saha -
thunderbird 102.9.0-1 305
latest/candidate canonical✓ -
vlc 3.0.18 3078
latest/stable videolan✓ -
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