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Some tools like systemd's jounral need to retrieve the exit and cgroup information after a process has already been reaped. This can e.g., happen when retrieving a pidfd via SCM_PIDFD or SCM_PEERPIDFD. Link: https://lore.kernel.org/r/20250305-work-pidfs-kill_on_last_close-v3-6-c8c3d8361705@kernel.org Reviewed-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Christian Brauner <brauner@kernel.org>