1 files changed, 7 insertions, 1 deletions
diff --git a/block/block-backend.c b/block/block-backend.c
index ed2f4b67a2..b48c91f4e1 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -2158,6 +2158,11 @@ static int blk_do_set_aio_context(BlockBackend *blk, AioContext *new_context,
                 return ret;
             }
         }
+        /*
+         * Make blk->ctx consistent with the root node before we invoke any
+         * other operations like drain that might inquire blk->ctx
+         */
+        blk->ctx = new_context;
         if (tgm->throttle_state) {
             bdrv_drained_begin(bs);
             throttle_group_detach_aio_context(tgm);
@@ -2166,9 +2171,10 @@ static int blk_do_set_aio_context(BlockBackend *blk, AioContext *new_context,
         }
 
         bdrv_unref(bs);
+    } else {
+        blk->ctx = new_context;
     }
 
-    blk->ctx = new_context;
     return 0;
 }