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Synchronous DNS uses SIGALARM-based timeouts, which can cause crashes in some applications. This change is specifically prompted by <https://issues.apache.org/jira/browse/MESOS-7603> by way of <https://groups.google.com/d/msg/coreos-dev/KILPPDRSPcg/PBaNF6VGAgAJ> but probably a good thing to do anyway.