int path_has_submounts(const struct path *parent)
{
	struct check_mount data = { .mnt = parent->mnt, .mounted = 0 };

	read_seqlock_excl(&mount_lock);
	d_walk(parent->dentry, &data, path_check_mount, NULL);
	read_sequnlock_excl(&mount_lock);

	return data.mounted;
}

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.