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
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