1 files changed, 1 insertions, 0 deletions
diff --git a/block.c b/block.c
index b62f6f3..701f77f 100644
--- a/block.c
+++ b/block.c
@@ -6961,6 +6961,7 @@ void bdrv_activate_all(Error **errp)
     BdrvNextIterator it;
 
     GLOBAL_STATE_CODE();
+    GRAPH_RDLOCK_GUARD_MAINLOOP();
 
     for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
         AioContext *aio_context = bdrv_get_aio_context(bs);