long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc)
{
	LIST_HEAD(dispose);
	long freed;

	freed = list_lru_shrink_walk(&sb->s_dentry_lru, sc,
				     dentry_lru_isolate, &dispose);
	shrink_dentry_list(&dispose);
	return freed;
}

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.