* test/resolv/test_dns.rb (TestResolvDNS#test_query_ipv4_address):
  set timeout for recvfrom because if client thread is crashed, it
  waits infinity.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48981 b2dd03c8-39d4-4d8f-98ff-823fe69b080e