diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index fa88bf6ccce0..a7bac5fe2994 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -972,6 +972,12 @@ void psi_cgroup_free(struct cgroup *cgroup)
 		return;
 
 	cancel_delayed_work_sync(&cgroup->psi.avgs_work);
+	/*
+	 * A psi_schedule_poll_work() call racing the last trigger's
+	 * destruction may have re-armed the timer after psi_trigger_destroy()
+	 * deleted it. Spurious firing while the group is alive is harmless.
+	 */
+	timer_shutdown_sync(&cgroup->psi.poll_timer);
 	free_percpu(cgroup->psi.pcpu);
 	/* All triggers must be removed by now */
 	WARN_ONCE(cgroup->psi.poll_states, "psi: trigger leak\n");