- if (__sync_fetch_and_sub(&cache_refcount, 1) == 1)
- g_hash_table_destroy(cache);
+ /*
+ * We do not remove cache right away but delay it few seconds.
+ * The idea is that when IPv6 DNS server is added via RDNSS, it has a
+ * lifetime. When the lifetime expires we decrease the refcount so it
+ * is possible that the cache is then removed. Because a new DNS server
+ * is usually created almost immediately we would then loose the cache
+ * without any good reason. The small delay allows the new RDNSS to
+ * create a new DNS server instance and the refcount does not go to 0.
+ */
+ g_timeout_add_seconds(3, try_remove_cache, NULL);