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-rw-r--r--block/vpc.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/vpc.c b/block/vpc.c
index ceb87dd3d8..945847fe4a 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -446,9 +446,12 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
     }
 
     /* Disable migration when VHD images are used */
+    bdrv_graph_rdlock_main_loop();
     error_setg(&s->migration_blocker, "The vpc format used by node '%s' "
                "does not support live migration",
                bdrv_get_device_or_node_name(bs));
+    bdrv_graph_rdunlock_main_loop();
+
     ret = migrate_add_blocker(s->migration_blocker, errp);
     if (ret < 0) {
         error_free(s->migration_blocker);