Public bug reported:
[Impact]
When a process is assigned to a new cgroup systemd first saves the PID of the
process then enqueues the job start for the new cgroup and finally assigns the
process to the cgroup after it was created.
This multiple step process can generate race condition if systemd is
restarted (or daemon-reload happens) after the PID has been saved but
before the cgroup has been created. When systemd restarts it loses the
PID assignment to the cgroup and later deletes the empty cgroup.
[Test Plan]
TODO
[Where problems could occur]
This should fix the mentioned race condition. I don't think anyone would be
expecting the previous behavior because it is non deterministic.
[Other Info]
This patch is available from systemd 247 so it is fixed in jammy and further
versions.
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Affects: systemd (Ubuntu Focal)
Importance: Undecided
Assignee: Jorge Merlino (jorge-merlino)
Status: Won't Fix
** Also affects: systemd (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: systemd (Ubuntu Focal)
Status: New => Won't Fix
** Changed in: systemd (Ubuntu Focal)
Assignee: (unassigned) => Jorge Merlino (jorge-merlino)
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https://bugs.launchpad.net/bugs/2162006
Title:
Fix race condition when systemd is restarted while assigning processes
to cgroups
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