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-rw-r--r--blockdev.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/blockdev.c b/blockdev.c
index 148df99e00..4cb8e1d91a 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2501,8 +2501,8 @@ void qmp_block_stream(const char *job_id, const char *device,
     /*
      * Check for op blockers in the whole chain between bs and base (or bottom)
      */
-    iter_end = bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs;
     bdrv_graph_rdlock_main_loop();
+    iter_end = bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs;
     for (iter = bs; iter && iter != iter_end;
          iter = bdrv_filter_or_cow_bs(iter))
     {