DATA RACE in the mockProxyProtocolProxy

[hawkingrei]

Bug Report

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1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

3. What did you see instead (Required)

==================
WARNING: DATA RACE
Read at 0x00c01fdd3068 by goroutine 26766:
  net.(*TCPListener).Addr()
      GOROOT/src/net/tcpsock.go:319 +0x30
  github.com/pingcap/tidb/server.(*mockProxyProtocolProxy).ListenAddr()
      server/tidb_test.go:3018 +0x85a
  github.com/pingcap/tidb/server.TestProxyProtocolWithIpFallbackable()
      server/tidb_test.go:3152 +0x896
  github.com/pingcap/tidb/domain.(*Domain).rebuildSysVarCache()
      domain/sysvar_cache.go:146 +0x8c4
  github.com/pingcap/tidb/domain.(*Domain).LoadSysVarCacheLoop()
      domain/domain.go:1619 +0xa8
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3345 +0x6d3
  github.com/pingcap/tidb/domain.(*Domain).GetSessionCache()
      domain/sysvar_cache.go:62 +0x5c
  github.com/pingcap/tidb/session.(*session).loadCommonGlobalVariablesIfNeeded()
      session/session.go:3692 +0x104
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2129 +0x145
  github.com/pingcap/tidb/session.(*session).ExecuteInternal()
      session/session.go:1667 +0x31b
  github.com/pingcap/tidb/domain.(*Domain).LoadPrivilegeLoop()
      domain/domain.go:1562 +0x130
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3338 +0x684
  github.com/pingcap/tidb/server.createTidbTestSuiteWithCfg()
      server/tidb_test.go:102 +0x236
  github.com/pingcap/tidb/server.createTidbTestSuite()
      server/tidb_test.go:91 +0x224
  github.com/pingcap/tidb/server.TestProxyProtocolWithIpFallbackable()
      server/tidb_test.go:3123 +0x285
  testing.tRunner()
      GOROOT/src/testing/testing.go:1576 +0x216
  testing.(*T).Run.func1()
      GOROOT/src/testing/testing.go:1629 +0x47
Previous write at 0x00c01fdd3068 by goroutine 52858:
  net.(*sysListener).listenTCP()
      GOROOT/src/net/tcpsock_posix.go:178 +0x14b
  net.(*ListenConfig).Listen()
      GOROOT/src/net/dial.go:636 +0x424
  net.Listen()
      GOROOT/src/net/dial.go:709 +0x85
  github.com/pingcap/tidb/server.(*mockProxyProtocolProxy).Run()
      server/tidb_test.go:3023 +0x6e
  github.com/pingcap/tidb/server.TestProxyProtocolWithIpFallbackable.func3()
      server/tidb_test.go:3144 +0x30
Goroutine 26766 (running) created at:
  testing.(*T).Run()
      GOROOT/src/testing/testing.go:1629 +0x805
  testing.runTests.func1()
      GOROOT/src/testing/testing.go:2036 +0x8d
  testing.tRunner()
      GOROOT/src/testing/testing.go:1576 +0x216
  testing.runTests()
      GOROOT/src/testing/testing.go:2034 +0x87c
  testing.(*M).Run()
      GOROOT/src/testing/testing.go:1906 +0xb44
  github.com/pingcap/tidb/testkit/testmain.(*testingM).Run()
      testkit/testmain/wrapper.go:27 +0x42
  go.uber.org/goleak.VerifyTestMain()
      external/org_uber_go_goleak/testmain.go:53 +0x70
  github.com/pingcap/tidb/server.TestMain()
      server/main_test.go:83 +0xf45
  main.main()
      bazel-out/k8-fastbuild/bin/server/server_test_/testmain.go:420 +0x5e8
Goroutine 52858 (running) created at:
  github.com/pingcap/tidb/server.TestProxyProtocolWithIpFallbackable()
      server/tidb_test.go:3143 +0x7a5
  github.com/pingcap/tidb/domain.(*Domain).rebuildSysVarCache()
      domain/sysvar_cache.go:146 +0x8c4
  github.com/pingcap/tidb/domain.(*Domain).LoadSysVarCacheLoop()
      domain/domain.go:1619 +0xa8
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3345 +0x6d3
  github.com/pingcap/tidb/domain.(*Domain).GetSessionCache()
      domain/sysvar_cache.go:62 +0x5c
  github.com/pingcap/tidb/session.(*session).loadCommonGlobalVariablesIfNeeded()
      session/session.go:3692 +0x104
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2129 +0x145
  github.com/pingcap/tidb/session.(*session).ExecuteInternal()
      session/session.go:1667 +0x31b
  github.com/pingcap/tidb/domain.(*Domain).LoadPrivilegeLoop()
      domain/domain.go:1562 +0x130
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3338 +0x684
  github.com/pingcap/tidb/server.createTidbTestSuiteWithCfg()
      server/tidb_test.go:102 +0x236
  github.com/pingcap/tidb/server.createTidbTestSuite()
      server/tidb_test.go:91 +0x224
  github.com/pingcap/tidb/server.TestProxyProtocolWithIpFallbackable()
      server/tidb_test.go:3123 +0x285
  testing.tRunner()
      GOROOT/src/testing/testing.go:1576 +0x216
  testing.(*T).Run.func1()
      GOROOT/src/testing/testing.go:1629 +0x47
================== 

4. What is your TiDB version? (Required)