diff --git a/include/linux/poison.h b/include/linux/poison.h
index 51334edec506..a39540326417 100644
--- a/include/linux/poison.h
+++ b/include/linux/poison.h
@@ -80,6 +80,7 @@
 /********** kernel/mutexes **********/
 #define MUTEX_DEBUG_INIT	0x11
 #define MUTEX_DEBUG_FREE	0x22
+#define MUTEX_POISON_WW_CTX	((void *) 0x500 + POISON_POINTER_DELTA)
 
 /********** lib/flex_array.c **********/
 #define FLEX_ARRAY_FREE	0x6c	/* for use-after-free poisoning */
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index cd8598aa0426..935116723a3d 100644
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -785,6 +785,10 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
 	if (!use_ww_ctx) {
 		/* add waiting tasks to the end of the waitqueue (FIFO): */
 		list_add_tail(&waiter.list, &lock->wait_list);
+
+#ifdef CONFIG_DEBUG_MUTEXES
+		waiter.ww_ctx = MUTEX_POISON_WW_CTX;
+#endif
 	} else {
 		/* Add in stamp order, waking up waiters that must back off. */
 		ret = __ww_mutex_add_waiter(&waiter, lock, ww_ctx);