Opening 127.0.0.1:9999 Opening INADDR_ANY:9999 bind: Address already in use Opening in6addr_any:9999 Opening INADDR_ANY:9999 bind: Address already in use Opening INADDR_ANY:9999 after closing ipv6 socket bind: Address already in use Success :: [ PASS ] :: Test '5..57 selftests: net:reuseaddr_conflict [PASS]'