cgroup: init_tasks shouldn't be linked to the root cgroup

5153faac18d2 ("cgroup: remove cgroup_enable_task_cg_lists()
optimization") removed lazy initialization of css_sets so that new
tasks are always lniked to its css_set. In the process, it incorrectly
ended up adding init_tasks to root css_set. They show up as PID 0's in
root's cgroup.procs triggering warnings in systemd and generally
confusing people.

Fix it by skip css_set linking for init_tasks.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: https://github.com/joanbm
Link: https://github.com/systemd/systemd/issues/14682
Fixes: 5153faac18d2 ("cgroup: remove cgroup_enable_task_cg_lists() optimization")
Cc: stable@vger.kernel.org # v5.5+

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index b374487..cf8a36b 100644 (file)
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -5932,11 +5932,14 @@ void cgroup_post_fork(struct task_struct *child)
 
        spin_lock_irq(&css_set_lock);
 
-       WARN_ON_ONCE(!list_empty(&child->cg_list));
-       cset = task_css_set(current); /* current is @child's parent */
-       get_css_set(cset);
-       cset->nr_tasks++;
-       css_set_move_task(child, NULL, cset, false);
+       /* init tasks are special, only link regular threads */
+       if (likely(child->pid)) {
+               WARN_ON_ONCE(!list_empty(&child->cg_list));
+               cset = task_css_set(current); /* current is @child's parent */
+               get_css_set(cset);
+               cset->nr_tasks++;
+               css_set_move_task(child, NULL, cset, false);
+       }
 
        /*
         * If the cgroup has to be frozen, the new task has too.  Let's set