diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index bfeef512f6dd..c0b72dcc0f03 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3197,7 +3197,16 @@ __acquires(&pool->lock)
 #ifdef CONFIG_PREEMPT_RT
 static void worker_lock_callback(struct worker_pool *pool)
 {
-	spin_lock(&pool->cb_lock);
+	/*
+	 * SINGLE_DEPTH_NESTING is for a dead pool's bh_worker() running from
+	 * drain_dead_softirq_workfn() inside a live pool's bh_worker(). The
+	 * unlocked read is stable: the flag is only set while @pool's CPU is
+	 * dead, inside a serialized hotplug operation. data_race() as the value
+	 * only affects the lockdep annotation and the read can be elided when
+	 * lockdep is disabled.
+	 */
+	spin_lock_nested(&pool->cb_lock,
+			 data_race(pool->flags) & POOL_BH_DRAINING ? SINGLE_DEPTH_NESTING : 0);
 }
 
 static void worker_unlock_callback(struct worker_pool *pool)