static int debug_fill_super(struct super_block *sb, void *data, int silent)
{
	static const struct tree_descr debug_files[] = {{""}};
	struct debugfs_fs_info *fsi;
	int err;

	save_mount_options(sb, data);

	fsi = kzalloc(sizeof(struct debugfs_fs_info), GFP_KERNEL);
	sb->s_fs_info = fsi;
	if (!fsi) {
		err = -ENOMEM;
		goto fail;
	}

	err = debugfs_parse_options(data, &fsi->mount_opts);
	if (err)
		goto fail;

	err  =  simple_fill_super(sb, DEBUGFS_MAGIC, debug_files);
	if (err)
		goto fail;

	sb->s_op = &debugfs_super_operations;
	sb->s_d_op = &debugfs_dops;

	debugfs_apply_options(sb);

	return 0;

fail:
	kfree(fsi);
	sb->s_fs_info = NULL;
	return err;
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.