diff --git a/block/io.c b/block/io.c
index 928c02d1ad..c4a4301321 100644
--- a/block/io.c
+++ b/block/io.c
@@ -718,11 +718,14 @@ BdrvTrackedRequest *coroutine_fn bdrv_co_get_self_request(BlockDriverState *bs)
     Coroutine *self = qemu_coroutine_self();
     IO_CODE();
 
+    qemu_mutex_lock(&bs->reqs_lock);
     QLIST_FOREACH(req, &bs->tracked_requests, list) {
         if (req->co == self) {
+            qemu_mutex_unlock(&bs->reqs_lock);
             return req;
         }
     }
+    qemu_mutex_unlock(&bs->reqs_lock);
 
     return NULL;
 }