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net/http: t.Parallel causes tests to crash with "Test appears to have a leaked Transport" #13804

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odeke-em opened this issue Jan 3, 2016 · 1 comment
Closed

net/http: t.Parallel causes tests to crash with "Test appears to have a leaked Transport" #13804

odeke-em opened this issue Jan 3, 2016 · 1 comment
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Go1.6

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@odeke-em
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odeke-em commented Jan 3, 2016

This is probably a regression from commit 04d732b
as commenting out t.Parallel lets the tests run with the adequate time.
screen shot 2016-01-03 at 5 48 47 am

This consistently happens on

$ uname -a
Darwin Emmanuels-MacBook-Pro.local 15.2.0 Darwin Kernel Version 15.2.0: Fri Nov 13 19:56:56 PST 2015; root:xnu-3248.20.55~2/RELEASE_X86_64 x86_64

The crash dump for three runs is below

$ go test -coverprofile=master-coverage.out
--- FAIL: TestTLSHandshakeTimeout (1.27s)
    main_test.go:112: Test appears to have leaked a Transport:
        net.runtime_pollWait(0x20075e8, 0x72, 0xe40050)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/netpoll.go:160 +0x60
        net.(*pollDesc).Wait(0xc8200540d0, 0x72, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:73 +0x3a
        net.(*pollDesc).WaitRead(0xc8200540d0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:78 +0x36
        net.(*netFD).accept(0xc820054070, 0x0, 0xe4f938, 0xc8205a83e0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_unix.go:426 +0x27c
        net.(*TCPListener).AcceptTCP(0xc82039c008, 0xc82003aea0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:254 +0x4d
        net.(*TCPListener).Accept(0xc82039c008, 0x0, 0x0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:264 +0x3d
        net/http.(*Server).Serve(0xc8202ca080, 0xe4e870, 0xc82039c008, 0x0, 0x0)
            net/http/_test/_obj_test/server.go:2387 +0x165
        net/http/httptest.(*Server).goServe.func1(0xc820950180)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:216 +0x75
        created by net/http/httptest.(*Server).goServe
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:217 +0x58

        net/http.(*persistConn).readLoop(0xc8200160c0)
            net/http/_test/_obj_test/transport.go:1272 +0xc73
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:922 +0xf60

        net/http.(*persistConn).writeLoop(0xc8200160c0)
            net/http/_test/_obj_test/transport.go:1393 +0x4d6
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:923 +0xf85

        net/http_test.TestTransportCancelRequest.func1(0x2042078, 0xc8205f6000, 0xc8205fc0e0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1461 +0xf5
        net/http.HandlerFunc.ServeHTTP(0xc8205de040, 0x2042078, 0xc8205f6000, 0xc8205fc0e0)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.serverHandler.ServeHTTP(0xc8202ca080, 0x2042078, 0xc8205f6000, 0xc8205fc0e0)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc82007c600)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4

        testing.RunTests(0x63f560, 0x7e7b20, 0x13a, 0x13a, 0x7d6901)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:597 +0x564
        testing.(*M).Run(0xc820034f08, 0xc820049e18)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:509 +0x81
        net/http_test.TestMain(0xc820034f08)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/main_test.go:19 +0x21
        main.main()
            net/http/_test/_testmain.go:802 +0x253

        time.Sleep(0x3b9aca00)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestTransportCancelRequest.func2(0xc8202342c0, 0xc8201142a0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1476 +0x20
        created by net/http_test.TestTransportCancelRequest
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1478 +0x54d

        time.Sleep(0x77359400)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestTransportResponseHeaderTimeout.func2(0x2042078, 0xc820016180, 0xc8200c7260)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1392 +0x48
        net/http.HandlerFunc.ServeHTTP(0xc82010c050, 0x2042078, 0xc820016180, 0xc8200c7260)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.(*ServeMux).ServeHTTP(0xc820166090, 0x2042078, 0xc820016180, 0xc8200c7260)
            net/http/_test/_obj_test/server.go:2155 +0x1c3
        net/http.serverHandler.ServeHTTP(0xc82007c680, 0x2042078, 0xc820016180, 0xc8200c7260)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc8202ca500)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4
--- FAIL: TestServerTimeouts (1.91s)
    main_test.go:112: Test appears to have leaked a Transport:
        net.runtime_pollWait(0x2005a28, 0x72, 0xe40050)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/netpoll.go:160 +0x60
        net.(*pollDesc).Wait(0xc8202bc140, 0x72, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:73 +0x3a
        net.(*pollDesc).WaitRead(0xc8202bc140, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:78 +0x36
        net.(*netFD).accept(0xc8202bc0e0, 0x0, 0xe4f938, 0xc8205e0340)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_unix.go:426 +0x27c
        net.(*TCPListener).AcceptTCP(0xc820362010, 0xc820037ea0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:254 +0x4d
        net.(*TCPListener).Accept(0xc820362010, 0x0, 0x0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:264 +0x3d
        net/http.(*Server).Serve(0xc8202ca000, 0xe4e870, 0xc820362010, 0x0, 0x0)
            net/http/_test/_obj_test/server.go:2387 +0x165
        net/http/httptest.(*Server).goServe.func1(0xc82025d620)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:216 +0x75
        created by net/http/httptest.(*Server).goServe
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:217 +0x58

        net.runtime_pollWait(0x20075e8, 0x72, 0xe40050)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/netpoll.go:160 +0x60
        net.(*pollDesc).Wait(0xc8200540d0, 0x72, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:73 +0x3a
        net.(*pollDesc).WaitRead(0xc8200540d0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:78 +0x36
        net.(*netFD).accept(0xc820054070, 0x0, 0xe4f938, 0xc8205a83e0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_unix.go:426 +0x27c
        net.(*TCPListener).AcceptTCP(0xc82039c008, 0xc82003aea0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:254 +0x4d
        net.(*TCPListener).Accept(0xc82039c008, 0x0, 0x0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:264 +0x3d
        net/http.(*Server).Serve(0xc8202ca080, 0xe4e870, 0xc82039c008, 0x0, 0x0)
            net/http/_test/_obj_test/server.go:2387 +0x165
        net/http/httptest.(*Server).goServe.func1(0xc820950180)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:216 +0x75
        created by net/http/httptest.(*Server).goServe
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:217 +0x58

        net/http.(*persistConn).readLoop(0xc8200160c0)
            net/http/_test/_obj_test/transport.go:1272 +0xc73
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:922 +0xf60

        net/http.(*persistConn).readLoop(0xc820016240)
            net/http/_test/_obj_test/transport.go:1272 +0xc73
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:922 +0xf60

        net/http.(*persistConn).writeLoop(0xc8200160c0)
            net/http/_test/_obj_test/transport.go:1393 +0x4d6
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:923 +0xf85

        net/http.(*persistConn).writeLoop(0xc820016240)
            net/http/_test/_obj_test/transport.go:1393 +0x4d6
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:923 +0xf85

        net/http_test.TestCancelRequestWithChannel.func1(0x2042078, 0xc8205f6180, 0xc8200c70a0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1571 +0xf5
        net/http.HandlerFunc.ServeHTTP(0xc8205de0d0, 0x2042078, 0xc8205f6180, 0xc8200c70a0)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.serverHandler.ServeHTTP(0xc8202ca000, 0x2042078, 0xc8205f6180, 0xc8200c70a0)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc8202caa00)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4

        net/http_test.TestTransportCancelRequest.func1(0x2042078, 0xc8205f6000, 0xc8205fc0e0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1461 +0xf5
        net/http.HandlerFunc.ServeHTTP(0xc8205de040, 0x2042078, 0xc8205f6000, 0xc8205fc0e0)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.serverHandler.ServeHTTP(0xc8202ca080, 0x2042078, 0xc8205f6000, 0xc8205fc0e0)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc82007c600)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4

        testing.RunTests(0x63f560, 0x7e7b20, 0x13a, 0x13a, 0x7d6900)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:597 +0x564
        testing.(*M).Run(0xc820039f08, 0xc820049e18)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:509 +0x81
        net/http_test.TestMain(0xc820039f08)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/main_test.go:19 +0x21
        main.main()
            net/http/_test/_testmain.go:802 +0x253

        time.Sleep(0x3b9aca00)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestCancelRequestWithChannel.func2(0xc82025c240)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1589 +0x20
        created by net/http_test.TestCancelRequestWithChannel
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1591 +0x594

        time.Sleep(0x3b9aca00)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestTransportCancelRequest.func2(0xc8202342c0, 0xc8201142a0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1476 +0x20
        created by net/http_test.TestTransportCancelRequest
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1478 +0x54d

        time.Sleep(0x77359400)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestTransportResponseHeaderTimeout.func2(0x2042078, 0xc820016180, 0xc8200c7260)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1392 +0x48
        net/http.HandlerFunc.ServeHTTP(0xc82010c050, 0x2042078, 0xc820016180, 0xc8200c7260)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.(*ServeMux).ServeHTTP(0xc820166090, 0x2042078, 0xc820016180, 0xc8200c7260)
            net/http/_test/_obj_test/server.go:2155 +0x1c3
        net/http.serverHandler.ServeHTTP(0xc82007c680, 0x2042078, 0xc820016180, 0xc8200c7260)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc8202ca500)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4
FAIL
coverage: 79.4% of statements
exit status 1
FAIL    net/http    20.030s
Emmanuels-MacBook-Pro:http emmanuelodeke$ 
Emmanuels-MacBook-Pro:http emmanuelodeke$ go test -coverprofile=master-coverage.out
--- FAIL: TestTLSHandshakeTimeout (1.27s)
    main_test.go:112: Test appears to have leaked a Transport:
        net.runtime_pollWait(0xdc55d8, 0x72, 0xd40050)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/netpoll.go:160 +0x60
        net.(*pollDesc).Wait(0xc82011a0d0, 0x72, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:73 +0x3a
        net.(*pollDesc).WaitRead(0xc82011a0d0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:78 +0x36
        net.(*netFD).accept(0xc82011a070, 0x0, 0xdc2350, 0xc820398620)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_unix.go:426 +0x27c
        net.(*TCPListener).AcceptTCP(0xc82088e010, 0xc82028fea0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:254 +0x4d
        net.(*TCPListener).Accept(0xc82088e010, 0x0, 0x0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:264 +0x3d
        net/http.(*Server).Serve(0xc820324180, 0xd82720, 0xc82088e010, 0x0, 0x0)
            net/http/_test/_obj_test/server.go:2387 +0x165
        net/http/httptest.(*Server).goServe.func1(0xc8208e6180)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:216 +0x75
        created by net/http/httptest.(*Server).goServe
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:217 +0x58

        net/http.(*persistConn).readLoop(0xc8201d60c0)
            net/http/_test/_obj_test/transport.go:1272 +0xc73
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:922 +0xf60

        net/http.(*persistConn).writeLoop(0xc8201d60c0)
            net/http/_test/_obj_test/transport.go:1393 +0x4d6
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:923 +0xf85

        net/http_test.TestTransportCancelRequest.func1(0x1961078, 0xc8200160c0, 0xc820493340)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1461 +0xf5
        net/http.HandlerFunc.ServeHTTP(0xc82038c060, 0x1961078, 0xc8200160c0, 0xc820493340)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.serverHandler.ServeHTTP(0xc820324180, 0x1961078, 0xc8200160c0, 0xc820493340)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc820324280)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4

        testing.RunTests(0x63f560, 0x7e7b20, 0x13a, 0x13a, 0x7d6901)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:597 +0x564
        testing.(*M).Run(0xc82028df08, 0xc820049e18)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:509 +0x81
        net/http_test.TestMain(0xc82028df08)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/main_test.go:19 +0x21
        main.main()
            net/http/_test/_testmain.go:802 +0x253

        time.Sleep(0x3b9aca00)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestTransportCancelRequest.func2(0xc8200c0370, 0xc820492460)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1476 +0x20
        created by net/http_test.TestTransportCancelRequest
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1478 +0x54d

        time.Sleep(0x77359400)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestTransportResponseHeaderTimeout.func2(0x1961078, 0xc8201d6000, 0xc8204920e0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1392 +0x48
        net/http.HandlerFunc.ServeHTTP(0xc8203d2040, 0x1961078, 0xc8201d6000, 0xc8204920e0)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.(*ServeMux).ServeHTTP(0xc8203620c0, 0x1961078, 0xc8201d6000, 0xc8204920e0)
            net/http/_test/_obj_test/server.go:2155 +0x1c3
        net/http.serverHandler.ServeHTTP(0xc82008c080, 0x1961078, 0xc8201d6000, 0xc8204920e0)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc8200fe100)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4
--- FAIL: TestServerTimeouts (1.92s)
    main_test.go:112: Test appears to have leaked a Transport:
        net.runtime_pollWait(0xdc55d8, 0x72, 0xd40050)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/netpoll.go:160 +0x60
        net.(*pollDesc).Wait(0xc82011a0d0, 0x72, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:73 +0x3a
        net.(*pollDesc).WaitRead(0xc82011a0d0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:78 +0x36
        net.(*netFD).accept(0xc82011a070, 0x0, 0xdc2350, 0xc820398620)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_unix.go:426 +0x27c
        net.(*TCPListener).AcceptTCP(0xc82088e010, 0xc82028fea0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:254 +0x4d
        net.(*TCPListener).Accept(0xc82088e010, 0x0, 0x0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:264 +0x3d
        net/http.(*Server).Serve(0xc820324180, 0xd82720, 0xc82088e010, 0x0, 0x0)
            net/http/_test/_obj_test/server.go:2387 +0x165
        net/http/httptest.(*Server).goServe.func1(0xc8208e6180)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:216 +0x75
        created by net/http/httptest.(*Server).goServe
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:217 +0x58

        net.runtime_pollWait(0xdc5c98, 0x72, 0xd40050)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/netpoll.go:160 +0x60
        net.(*pollDesc).Wait(0xc82011a290, 0x72, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:73 +0x3a
        net.(*pollDesc).WaitRead(0xc82011a290, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:78 +0x36
        net.(*netFD).accept(0xc82011a230, 0x0, 0xdc2350, 0xc8203a4360)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_unix.go:426 +0x27c
        net.(*TCPListener).AcceptTCP(0xc82088e008, 0xc82003aea0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:254 +0x4d
        net.(*TCPListener).Accept(0xc82088e008, 0x0, 0x0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:264 +0x3d
        net/http.(*Server).Serve(0xc82007c700, 0xd82720, 0xc82088e008, 0x0, 0x0)
            net/http/_test/_obj_test/server.go:2387 +0x165
        net/http/httptest.(*Server).goServe.func1(0xc8208e6240)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:216 +0x75
        created by net/http/httptest.(*Server).goServe
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:217 +0x58

        net/http.(*persistConn).readLoop(0xc8201d60c0)
            net/http/_test/_obj_test/transport.go:1272 +0xc73
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:922 +0xf60

        net/http.(*persistConn).readLoop(0xc8201d6180)
            net/http/_test/_obj_test/transport.go:1272 +0xc73
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:922 +0xf60

        net/http.(*persistConn).writeLoop(0xc8201d60c0)
            net/http/_test/_obj_test/transport.go:1393 +0x4d6
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:923 +0xf85

        net/http.(*persistConn).writeLoop(0xc8201d6180)
            net/http/_test/_obj_test/transport.go:1393 +0x4d6
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:923 +0xf85

        net/http_test.TestCancelRequestWithChannel.func1(0x1961078, 0xc820016180, 0xc8202fa7e0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1571 +0xf5
        net/http.HandlerFunc.ServeHTTP(0xc82038c0c0, 0x1961078, 0xc820016180, 0xc8202fa7e0)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.serverHandler.ServeHTTP(0xc82007c700, 0x1961078, 0xc820016180, 0xc8202fa7e0)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc82007c680)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4

        net/http_test.TestTransportCancelRequest.func1(0x1961078, 0xc8200160c0, 0xc820493340)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1461 +0xf5
        net/http.HandlerFunc.ServeHTTP(0xc82038c060, 0x1961078, 0xc8200160c0, 0xc820493340)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.serverHandler.ServeHTTP(0xc820324180, 0x1961078, 0xc8200160c0, 0xc820493340)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc820324280)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4

        testing.RunTests(0x63f560, 0x7e7b20, 0x13a, 0x13a, 0x7d6900)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:597 +0x564
        testing.(*M).Run(0xc820035f08, 0xc820049e18)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:509 +0x81
        net/http_test.TestMain(0xc820035f08)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/main_test.go:19 +0x21
        main.main()
            net/http/_test/_testmain.go:802 +0x253

        time.Sleep(0x3b9aca00)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestCancelRequestWithChannel.func2(0xc8208e6540)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1589 +0x20
        created by net/http_test.TestCancelRequestWithChannel
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1591 +0x594

        time.Sleep(0x3b9aca00)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestTransportCancelRequest.func2(0xc8200c0370, 0xc820492460)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1476 +0x20
        created by net/http_test.TestTransportCancelRequest
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1478 +0x54d

        time.Sleep(0x77359400)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestTransportResponseHeaderTimeout.func2(0x1961078, 0xc8201d6000, 0xc8204920e0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1392 +0x48
        net/http.HandlerFunc.ServeHTTP(0xc8203d2040, 0x1961078, 0xc8201d6000, 0xc8204920e0)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.(*ServeMux).ServeHTTP(0xc8203620c0, 0x1961078, 0xc8201d6000, 0xc8204920e0)
            net/http/_test/_obj_test/server.go:2155 +0x1c3
        net/http.serverHandler.ServeHTTP(0xc82008c080, 0x1961078, 0xc8201d6000, 0xc8204920e0)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc8200fe100)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4
FAIL
coverage: 79.4% of statements
exit status 1
FAIL    net/http    21.421s

After commenting out the

// t.Parallel()

line in server_test.go that test no longer crashes as you'll see below.

$ go test -cover
--- FAIL: TestTransportPersistConnLeakShortBody (1.46s)
    transport_test.go:1071: goroutine growth: 29 -> 35 -> 37 (delta: 8)
    transport_test.go:1073: too many new goroutines
    main_test.go:112: Test appears to have leaked a Transport:
        net.runtime_pollWait(0xf61a28, 0x72, 0xc40050)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/netpoll.go:160 +0x60
        net.(*pollDesc).Wait(0xc820468530, 0x72, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:73 +0x3a
        net.(*pollDesc).WaitRead(0xc820468530, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:78 +0x36
        net.(*netFD).accept(0xc8204684d0, 0x0, 0xc4e898, 0xc8205d3d20)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_unix.go:426 +0x27c
        net.(*TCPListener).AcceptTCP(0xc8208ea020, 0xc82012aea0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:254 +0x4d
        net.(*TCPListener).Accept(0xc8208ea020, 0x0, 0x0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:264 +0x3d
        net/http.(*Server).Serve(0xc8201e4480, 0xf61740, 0xc8208ea020, 0x0, 0x0)
            net/http/_test/_obj_test/server.go:2387 +0x165
        net/http/httptest.(*Server).goServe.func1(0xc82012e6c0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:216 +0x75
        created by net/http/httptest.(*Server).goServe
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:217 +0x58

        net/http.(*persistConn).readLoop(0xc8207bc300)
            net/http/_test/_obj_test/transport.go:1272 +0xc73
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:922 +0xf60

        net/http.(*persistConn).writeLoop(0xc8207bc300)
            net/http/_test/_obj_test/transport.go:1393 +0x4d6
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:923 +0xf85

        net/http_test.TestTransportCancelRequest.func1(0xc82078, 0xc8206fa000, 0xc82069c000)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1461 +0xf5
        net/http.HandlerFunc.ServeHTTP(0xc82059e1d0, 0xc82078, 0xc8206fa000, 0xc82069c000)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.serverHandler.ServeHTTP(0xc8201e4480, 0xc82078, 0xc8206fa000, 0xc82069c000)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc82007a880)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4

        testing.RunTests(0x63f540, 0x7e7b20, 0x13a, 0x13a, 0x7d6901)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:597 +0x564
        testing.(*M).Run(0xc8206c5f08, 0xc820049e18)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:509 +0x81
        net/http_test.TestMain(0xc8206c5f08)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/main_test.go:19 +0x21
        main.main()
            net/http/_test/_testmain.go:802 +0x253

        time.Sleep(0x3b9aca00)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestTransportCancelRequest.func2(0xc82073a0b0, 0xc8200c57a0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1476 +0x20
        created by net/http_test.TestTransportCancelRequest
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1478 +0x54d

        time.Sleep(0x77359400)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestTransportResponseHeaderTimeout.func2(0xc82078, 0xc8206fa0c0, 0xc82069c1c0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1392 +0x48
        net/http.HandlerFunc.ServeHTTP(0xc82000a390, 0xc82078, 0xc8206fa0c0, 0xc82069c1c0)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.(*ServeMux).ServeHTTP(0xc820182090, 0xc82078, 0xc8206fa0c0, 0xc82069c1c0)
            net/http/_test/_obj_test/server.go:2155 +0x1c3
        net/http.serverHandler.ServeHTTP(0xc82007a780, 0xc82078, 0xc8206fa0c0, 0xc82069c1c0)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc8201e4000)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4
--- FAIL: TestServerTimeouts (1.92s)
    main_test.go:112: Test appears to have leaked a Transport:
        net.runtime_pollWait(0xc88278, 0x72, 0xc40050)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/netpoll.go:160 +0x60
        net.(*pollDesc).Wait(0xc82005c530, 0x72, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:73 +0x3a
        net.(*pollDesc).WaitRead(0xc82005c530, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:78 +0x36
        net.(*netFD).accept(0xc82005c4d0, 0x0, 0xc4e898, 0xc8205d3c20)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_unix.go:426 +0x27c
        net.(*TCPListener).AcceptTCP(0xc820028038, 0xc820128ea0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:254 +0x4d
        net.(*TCPListener).Accept(0xc820028038, 0x0, 0x0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:264 +0x3d
        net/http.(*Server).Serve(0xc82007a800, 0xf61740, 0xc820028038, 0x0, 0x0)
            net/http/_test/_obj_test/server.go:2387 +0x165
        net/http/httptest.(*Server).goServe.func1(0xc820506120)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:216 +0x75
        created by net/http/httptest.(*Server).goServe
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:217 +0x58

        net/http.(*persistConn).readLoop(0xc8206fa180)
            net/http/_test/_obj_test/transport.go:1272 +0xc73
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:922 +0xf60

        net/http.(*persistConn).writeLoop(0xc8206fa180)
            net/http/_test/_obj_test/transport.go:1393 +0x4d6
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:923 +0xf85

        net/http_test.TestCancelRequestWithChannel.func1(0xc82078, 0xc8207bc000, 0xc8205482a0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1571 +0xf5
        net/http.HandlerFunc.ServeHTTP(0xc8205e21b0, 0xc82078, 0xc8207bc000, 0xc8205482a0)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.serverHandler.ServeHTTP(0xc82007a800, 0xc82078, 0xc8207bc000, 0xc8205482a0)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc82007ad80)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4

        testing.RunTests(0x63f540, 0x7e7b20, 0x13a, 0x13a, 0x7d6900)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:597 +0x564
        testing.(*M).Run(0xc8206c5f08, 0xc820049e18)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:509 +0x81
        net/http_test.TestMain(0xc8206c5f08)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/main_test.go:19 +0x21
        main.main()
            net/http/_test/_testmain.go:802 +0x253

        time.Sleep(0x3b9aca00)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestCancelRequestWithChannel.func2(0xc820506180)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1589 +0x20
        created by net/http_test.TestCancelRequestWithChannel
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1591 +0x594

        time.Sleep(0x77359400)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestTransportResponseHeaderTimeout.func2(0xc82078, 0xc8206fa0c0, 0xc82069c1c0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1392 +0x48
        net/http.HandlerFunc.ServeHTTP(0xc82000a390, 0xc82078, 0xc8206fa0c0, 0xc82069c1c0)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.(*ServeMux).ServeHTTP(0xc820182090, 0xc82078, 0xc8206fa0c0, 0xc82069c1c0)
            net/http/_test/_obj_test/server.go:2155 +0x1c3
        net/http.serverHandler.ServeHTTP(0xc82007a780, 0xc82078, 0xc8206fa0c0, 0xc82069c1c0)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc8201e4000)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4
--- FAIL: TestTransportCancelRequest (2.02s)
    main_test.go:112: Test appears to have leaked a Transport:
        net.runtime_pollWait(0xc88278, 0x72, 0xc40050)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/netpoll.go:160 +0x60
        net.(*pollDesc).Wait(0xc82005c530, 0x72, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:73 +0x3a
        net.(*pollDesc).WaitRead(0xc82005c530, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_poll_runtime.go:78 +0x36
        net.(*netFD).accept(0xc82005c4d0, 0x0, 0xc4e898, 0xc8205d3c20)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/fd_unix.go:426 +0x27c
        net.(*TCPListener).AcceptTCP(0xc820028038, 0xc820128ea0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:254 +0x4d
        net.(*TCPListener).Accept(0xc820028038, 0x0, 0x0, 0x0, 0x0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/tcpsock_posix.go:264 +0x3d
        net/http.(*Server).Serve(0xc82007a800, 0xf61740, 0xc820028038, 0x0, 0x0)
            net/http/_test/_obj_test/server.go:2387 +0x165
        net/http/httptest.(*Server).goServe.func1(0xc820506120)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:216 +0x75
        created by net/http/httptest.(*Server).goServe
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/httptest/server.go:217 +0x58

        net/http.(*persistConn).readLoop(0xc8206fa180)
            net/http/_test/_obj_test/transport.go:1272 +0xc73
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:922 +0xf60

        net/http.(*persistConn).writeLoop(0xc8206fa180)
            net/http/_test/_obj_test/transport.go:1393 +0x4d6
        created by net/http.(*Transport).dialConn
            net/http/_test/_obj_test/transport.go:923 +0xf85

        net/http_test.TestCancelRequestWithChannel.func1(0xc82078, 0xc8207bc000, 0xc8205482a0)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1571 +0xf5
        net/http.HandlerFunc.ServeHTTP(0xc8205e21b0, 0xc82078, 0xc8207bc000, 0xc8205482a0)
            net/http/_test/_obj_test/server.go:1824 +0x44
        net/http.serverHandler.ServeHTTP(0xc82007a800, 0xc82078, 0xc8207bc000, 0xc8205482a0)
            net/http/_test/_obj_test/server.go:2340 +0x1d4
        net/http.(*conn).serve(0xc82007ad80)
            net/http/_test/_obj_test/server.go:1719 +0x10b4
        created by net/http.(*Server).Serve
            net/http/_test/_obj_test/server.go:2416 +0x4e4

        testing.RunTests(0x63f540, 0x7e7b20, 0x13a, 0x13a, 0x7d6900)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:597 +0x564
        testing.(*M).Run(0xc8206c9f08, 0xc820049e18)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/testing/testing.go:509 +0x81
        net/http_test.TestMain(0xc8206c9f08)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/main_test.go:19 +0x21
        main.main()
            net/http/_test/_testmain.go:802 +0x253

        time.Sleep(0x3b9aca00)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/time.go:59 +0xf9
        net/http_test.TestCancelRequestWithChannel.func2(0xc820506180)
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1589 +0x20
        created by net/http_test.TestCancelRequestWithChannel
            /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/net/http/transport_test.go:1591 +0x594
FAIL
coverage: 79.4% of statements
exit status 1
FAIL    net/http    21.163s
@ianlancetaylor ianlancetaylor added this to the Go1.6 milestone Jan 4, 2016
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CL https://golang.org/cl/18143 mentions this issue.

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