void d_instantiate(struct dentry *entry, struct inode * inode)
{
	BUG_ON(!hlist_unhashed(&entry->d_u.d_alias));
	if (inode) {
		security_d_instantiate(entry, inode);
		spin_lock(&inode->i_lock);
		__d_instantiate(entry, inode);
		spin_unlock(&inode->i_lock);
	}
}

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.