cgroup: Increment nr_dying_subsys_* from rmdir context

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Incrementing nr_dying_subsys_* in offline_css(), which is executed by
cgroup_offline_wq worker, leads to a race where user can see the value
to be 0 if he reads cgroup.stat after calling rmdir and before the worker
executes. This makes the user wrongly expect resources released by the
removed cgroup to be available for a new assignment.

Increment nr_dying_subsys_* from kill_css(), which is called from the
cgroup_rmdir() context.

Fixes: ab03125268 ("cgroup: Show # of subsystem CSSes in cgroup.stat")
Signed-off-by: Petr Malat <oss@malat.biz>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Petr Malat 2026-04-23 04:48:26 -05:00 • committed by Tejun Heo

parent 41d701ddc3

commit 13e786b64b

1 changed files with 12 additions and 10 deletions

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kernel/cgroup/cgroup.c

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