
When no DNS servers are configured (and thus there is no chance that the DNS query will suceed), res_nsend returns early, but it does not tell the cache that the query has failed. Therefore, if the caller retries the query, it will block for PENDING_REQUEST_TIMEOUT (= 20 seconds) waiting for the "existing query" (which isn't actually doing anything) to complete. Bug: 18240188 Bug: 18327075 Change-Id: I0df13ff4a17ee65e640be96695a3af31b020963a
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