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-rw-r--r--block/block-backend.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/block/block-backend.c b/block/block-backend.c
index fd10fcc2d0..39aac1bbce 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -2388,6 +2388,7 @@ bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp)
 {
     BlockDriverState *bs = blk_bs(blk);
     GLOBAL_STATE_CODE();
+    GRAPH_RDLOCK_GUARD_MAINLOOP();
 
     if (!bs) {
         return false;