diff --git a/block.c b/block.c
index 0f7f78f8de..06d2a1b256 100644
--- a/block.c
+++ b/block.c
@@ -3371,7 +3371,8 @@ void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child)
 }
 
 
-static void bdrv_parent_cb_change_media(BlockDriverState *bs, bool load)
+static void GRAPH_RDLOCK
+bdrv_parent_cb_change_media(BlockDriverState *bs, bool load)
 {
     BdrvChild *c;
     GLOBAL_STATE_CODE();
@@ -3969,6 +3970,9 @@ bdrv_open_inherit(const char *filename, const char *reference, QDict *options,
     GLOBAL_STATE_CODE();
     assert(!qemu_in_coroutine());
 
+    /* TODO We'll eventually have to take a writer lock in this function */
+    GRAPH_RDLOCK_GUARD_MAINLOOP();
+
     if (reference) {
         bool options_non_empty = options ? qdict_size(options) : false;
         qobject_unref(options);