** Also affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2062534
Title:
GDM3 autologin might be racy on GCP resulting in inconsistent state of
the wayland setup of seat0
Status in gdm3 package in Ubuntu:
New
Status in linux-gcp package in Ubuntu:
New
Bug description:
This might not be a bug really about linux-gcp, but this is following
the work on bug 2039732 and so far I could not reproduce that locally.
Setup is 22.04 uptodate on GCP n2-standard instances, without GPU
attached thus relying on vkms. I have reproduced locally a similar
setup but on a KVM host.
We rely on
https://github.com/taskcluster/taskcluster/tree/main/workers/generic-worker#readme
to run tasks on CI, and especially generic-worker will:
- create a new task_XXX user
- make it autologin in gdm3 config
- generic-worker has code to probe for existence of the GNOME Wayland
session before launching the task
We relied on wl-clipboard package installed for verifying the status
of wayland
On top of that setup, here is the issue.
We issue a TC task with payload:
> export WAYLAND_DISPLAY=wayland-0
> export XDG_RUNTIME_DIR=/run/user/$(id -u)
> wl-paste -l -p
We expect that payload to report "No selection", but on GCP instances
we mostly always end up with "This seat has no keyboard". There were
also cases were the session would not be Wayland at all but rather
X11. I think this suggests something around the availability of
/dev/dri/card0, but forcing the gdm3 service to wait for its
availability and adding extra waiting time after card0 is present
would still not get us somewhere.
We enabled gdm3 as well as mutter debugging but never found anything
that would be a good lead on why it was not yet ready.
At some point, the seat0 session of our user was shown as inactive and
the active one was tied to gdm so we suspected this was the reason,
but both forcing the session to be active and terminating the gdm
session would still not unblock us.
We also suspected the desktop to be locking itself so we disabled locking
with the following, but iit did not help much:
> cat > /etc/dconf/profile/user << EOF
> user-db:user
> system-db:local
> EOF
>
> mkdir /etc/dconf/db/local.d/
> # dconf user settings
> cat > /etc/dconf/db/local.d/00-tc-gnome-settings << EOF
> # /org/gnome/desktop/session/idle-delay
> [org/gnome/desktop/session]
> idle-delay=uint32 0
> # /org/gnome/desktop/lockdown/disable-lock-screen
> [org/gnome/desktop/lockdown]
> disable-lock-screen=true
> EOF
>
> sudo dconf update
In the end, the only viable and reliable (verified over hundreds of runs now)
fix that lasted was to add a "/bin/sleep 30" all to the gdm3 startup:
> mkdir -p /etc/systemd/system/gdm.service.d/
> cat > /etc/systemd/system/gdm.service.d/gdm-wait.conf << EOF
> [Unit]
> Description=Extra 30s wait
> [Service]
> ExecStartPre=/bin/sleep 30
> EOF
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