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-rw-r--r--blockdev.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/blockdev.c b/blockdev.c
index 43e0c4ddf2..ff5ee9ff7b 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2846,6 +2846,8 @@ BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat,
 
 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
 {
+    GRAPH_RDLOCK_GUARD_MAINLOOP();
+
     return bdrv_get_xdbg_block_graph(errp);
 }