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-rw-r--r--block/io.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/io.c b/block/io.c
index d9c1594960..b5459c2f41 100644
--- a/block/io.c
+++ b/block/io.c
@@ -3153,6 +3153,7 @@ void coroutine_fn bdrv_co_io_plug(BlockDriverState *bs)
 {
     BdrvChild *child;
     IO_CODE();
+    assert_bdrv_graph_readable();
 
     QLIST_FOREACH(child, &bs->children, next) {
         bdrv_co_io_plug(child->bs);
@@ -3170,6 +3171,7 @@ void coroutine_fn bdrv_co_io_unplug(BlockDriverState *bs)
 {
     BdrvChild *child;
     IO_CODE();
+    assert_bdrv_graph_readable();
 
     assert(bs->io_plugged);
     if (qatomic_fetch_dec(&bs->io_plugged) == 1) {