Curl_wait_for_resolv() could hang due to the bad timeout timer resolution and

  else if(conn->data->set.timeout)

    timeout = conn->data->set.timeout;

  /* We convert the number of seconds into number of milliseconds here: */

  if(timeout < 2147483)

    /* maximum amount of seconds that can be multiplied with 1000 and

       still fit within 31 bits */

    timeout *= 1000;

  else

    timeout = 0x7fffffff; /* ridiculous amount of time anyway */

  /* Wait for the name resolve query to complete. */

  while (1) {

    int nfds=0;

    struct timeval *tvp, tv, store;

    int count;

    struct timeval now = Curl_tvnow();

    long timediff;

    store.tv_sec = (int)timeout;

    store.tv_usec = 0;

    store.tv_sec = (int)timeout/1000;

    store.tv_usec = (timeout%1000)*1000;

    FD_ZERO(&read_fds);

    FD_ZERO(&write_fds);

    ares_process(data->state.areschannel, &read_fds, &write_fds);

    timeout -= Curl_tvdiff(Curl_tvnow(), now)/1000; /* spent time */

    timediff = Curl_tvdiff(Curl_tvnow(), now); /* spent time */

    timeout -= timediff?timediff:1; /* always deduct at least 1 */

    if (timeout < 0) {

      /* our timeout, so we cancel the ares operation */

      ares_cancel(data->state.areschannel);