net: TestDualStackTCPListener failures

[gopherbot]

#!watchflakes
default <- pkg == "net" && test == "TestDualStackTCPListener"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestDualStackTCPListener
    listen_test.go:273: listen tcp :49159: bind: address already in use
    listen_test.go:273: listen tcp :49164: bind: address already in use
--- FAIL: TestDualStackTCPListener (0.01s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "net" && test == "TestDualStackTCPListener"

2024-10-07 15:34 gotip-darwin-amd64-longtest go@63cd5a39 net.TestDualStackTCPListener (log)

=== RUN   TestDualStackTCPListener
    listen_test.go:273: listen tcp :49159: bind: address already in use
    listen_test.go:273: listen tcp :49164: bind: address already in use
--- FAIL: TestDualStackTCPListener (0.01s)

— watchflakes