by treyharris:

Before filing a bug, please check whether it has been fixed since
the latest release: run "hg pull -u" and retry what you did to
reproduce the problem.  Thanks.

What steps will reproduce the problem?
1. cd pkg/net
2. make test

What is the expected output? What do you see instead?
gotest
rm -f _test/net.a _gotest_.8
8g -o _gotest_.8 dnsclient.go dnsconfig.go dnsmsg.go fd.go fd_darwin.go ip.go ipsock.go 
net.go parse.go port.go sock.go tcpsock.go udpsock.go unixsock.go    dialgoogle_test.go 
ip_test.go net_test.go parse_test.go port_test.go server_test.go timeout_test.go
rm -f _test/net.a
gopack grc _test/net.a _gotest_.8 
--- FAIL: net.TestUDPServer
    TestPacket udp 0.0.0.0 127.0.0.1
    TestPacket udp  127.0.0.1
    TestPacket udp [::] [::ffff:127.0.0.1]
    TestPacket udp [::] 127.0.0.1
    TestPacket udp 0.0.0.0 [::ffff:127.0.0.1]
    TestPacket udp 0.0.0.0 127.0.0.1
    TestPacket udp  127.0.0.1
    TestPacket udp [::] [::ffff:127.0.0.1]
    fd.Read() = 0, read udp:127.0.0.1:50796->127.0.0.1:50224: resource temporarily 
unavailable (want 0, nil)
FAIL
make: *** [test] Error 1


What is your $GOOS?  $GOARCH?

darwin 386

Which revision are you using?  (hg identify)
68ebc44e8429 tip

Please provide any additional information below.
dho asked me on IRC to submit this issue.