On Wed, Jul 03, 2024 at 02:52:29PM -0400, Waiman Long wrote: > The writing of css->cgroup associated with the cgroup root in > rebind_subsystems() is currently protected only by cgroup_mutex. > However, the reading of css->cgroup in both proc_cpuset_show() and > proc_cgroup_show() is protected just by css_set_lock. That makes the > readers susceptible to racing problems like data tearing or caching. > It is also a problem that can be reported by KCSAN. > > This can be fixed by using READ_ONCE() and WRITE_ONCE() to access > css->cgroup. Alternatively, the writing of css->cgroup can be moved > under css_set_lock as well which is done by this patch. > > Signed-off-by: Waiman Long <longman@xxxxxxxxxx> Applied to cgroup/for-6.10-fixes. Thanks. -- tejun
