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

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commit 0cd9d33ace upstream.

5153faac18 ("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: 5153faac18 ("cgroup: remove cgroup_enable_task_cg_lists() optimization")
Cc: stable@vger.kernel.org # v5.5+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Tejun Heo 2020-01-30 11:37:33 -05:00 • committed by Greg Kroah-Hartman

parent ab3584014c

commit dcf6b17b8a

1 changed files with 8 additions and 5 deletions

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kernel/cgroup/cgroup.c

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