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Pull cgroup fix from Tejun Heo: - The task iterator could pick up a dying task whose refcount had already dropped to zero and resurrect it, leading to a use-after-free when reading cgroup.procs. Skip such tasks. * tag 'cgroup-for-7.3-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: cgroup: Avoid iteration of dying tasks with zero refcount