--- fs/btrfs/transaction.c

+++ fs/btrfs/transaction.c

@@ -777,6 +777,7 @@ static noinline int create_pending_snaps

record_root_in_trans(trans, root);

btrfs_set_root_last_snapshot(&root->root_item, trans->transid);

memcpy(new_root_item, &root->root_item, sizeof(*new_root_item));

+ btrfs_check_and_init_root_item(new_root_item);

key.objectid = objectid;

/* record when the snapshot was created in key.offset */