net/http: data race in TestIdleConnChannelLeak

[cuonglm]

https://storage.googleapis.com/go-build-log/7b8a05da/linux-amd64-race_7029367f.log

==================
WARNING: DATA RACE
Write at 0x000000f00218 by goroutine 1479:
  net/http.SetReadLoopBeforeNextReadHook()
      /workdir/go/src/net/http/export_test.go:76 +0x29e
  net/http_test.testIdleConnChannelLeak()
      /workdir/go/src/net/http/transport_test.go:3189 +0x1dd
  net/http_test.run[...].func1()
      /workdir/go/src/net/http/clientserver_test.go:90 +0x194
  testing.tRunner()
      /workdir/go/src/testing/testing.go:1579 +0x238
  testing.(*T).Run.func1()
      /workdir/go/src/testing/testing.go:1632 +0x44

Previous read at 0x000000f00218 by goroutine 1457:
  net/http.(*persistConn).readLoop()
      /workdir/go/src/net/http/transport.go:2108 +0x18f
  net/http.(*Transport).dialConn.func5()
      /workdir/go/src/net/http/transport.go:1772 +0x33

Goroutine 1479 (running) created at:
  testing.(*T).Run()
      /workdir/go/src/testing/testing.go:1632 +0x835
  net/http_test.run[...]()
      /workdir/go/src/net/http/clientserver_test.go:82 +0x390
  net/http_test.TestIdleConnChannelLeak()
      /workdir/go/src/net/http/transport_test.go:3174 +0xea
  testing.tRunner()
      /workdir/go/src/testing/testing.go:1579 +0x238
  testing.(*T).Run.func1()
      /workdir/go/src/testing/testing.go:1632 +0x44

Goroutine 1457 (finished) created at:
  net/http.(*Transport).dialConn()
      /workdir/go/src/net/http/transport.go:1772 +0x24d9
  net/http.(*Transport).dialConnFor()
      /workdir/go/src/net/http/transport.go:1463 +0x129
  net/http.(*Transport).queueForDial.func1()
      /workdir/go/src/net/http/transport.go:1432 +0x44
==================
--- FAIL: TestIdleConnChannelLeak (0.01s)
    --- FAIL: TestIdleConnChannelLeak/h1 (0.01s)
        testing.go:1449: race detected during execution of test
    testing.go:1449: race detected during execution of test
FAIL
FAIL	net/http	7.010s
FAIL

[gopherbot]

Change https://go.dev/cl/471555 mentions this issue: net/http: fix race condition with testHookReadLoopBeforeNextRead

[aclements]

Trybot example: https://storage.googleapis.com/go-build-log/f681ace5/linux-amd64-race_3e2d88ba.log