==================
WARNING: DATA RACE
Read at 0x00c01987b2f8 by goroutine 48454:
  github.com/pingcap/tidb/server.(*mockProxyProtocolProxy).ListenAddr()
      server/tidb_test.go:3020 +0x604
  github.com/pingcap/tidb/server.TestProxyProtocolWithIpFallbackable()
      server/tidb_test.go:3153 +0x656
  github.com/pingcap/tidb/domain.(*Domain).rebuildSysVarCache()
      domain/sysvar_cache.go:146 +0x7c4
  github.com/pingcap/tidb/domain.(*Domain).LoadSysVarCacheLoop()
      domain/domain.go:1449 +0xb9
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3350 +0x7cc
  github.com/pingcap/tidb/domain.(*Domain).GetSessionCache()
      domain/sysvar_cache.go:62 +0x71
  github.com/pingcap/tidb/session.(*session).loadCommonGlobalVariablesIfNeeded()
      session/session.go:3683 +0x11e
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2148 +0x16b
  github.com/pingcap/tidb/session.(*session).ExecuteInternal()
      session/session.go:1678 +0x365
  github.com/pingcap/tidb/domain.(*Domain).LoadPrivilegeLoop()
      domain/domain.go:1393 +0x143
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3343 +0x76c
  github.com/pingcap/tidb/server.createTidbTestSuiteWithCfg()
      server/tidb_test.go:102 +0x219
  github.com/pingcap/tidb/server.createTidbTestSuite()
      server/tidb_test.go:91 +0xc5
  github.com/pingcap/tidb/server.TestProxyProtocolWithIpFallbackable()
      server/tidb_test.go:3125 +0x110
  testing.tRunner()
      GOROOT/src/testing/testing.go:1576 +0x216
  testing.(*T).Run.func1()
      GOROOT/src/testing/testing.go:1629 +0x47

Previous write at 0x00c01987b2f8 by goroutine 70748:
  github.com/pingcap/tidb/server.(*mockProxyProtocolProxy).Run()
      server/tidb_test.go:3025 +0x96
  github.com/pingcap/tidb/server.TestProxyProtocolWithIpFallbackable.func3()
      server/tidb_test.go:3145 +0x30

Goroutine 48454 (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
  go.uber.org/goleak.VerifyTestMain()
      external/org_uber_go_goleak/testmain.go:53 +0x70
  github.com/pingcap/tidb/server.TestMain()
      server/main_test.go:74 +0xe59
  main.main()
      bazel-out/k8-fastbuild/bin/server/server_test_/testmain.go:424 +0x7ce

Goroutine 70748 (running) created at:
  github.com/pingcap/tidb/server.TestProxyProtocolWithIpFallbackable()
      server/tidb_test.go:3144 +0x56b
  github.com/pingcap/tidb/domain.(*Domain).rebuildSysVarCache()
      domain/sysvar_cache.go:146 +0x7c4
  github.com/pingcap/tidb/domain.(*Domain).LoadSysVarCacheLoop()
      domain/domain.go:1449 +0xb9
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3350 +0x7cc
  github.com/pingcap/tidb/domain.(*Domain).GetSessionCache()
      domain/sysvar_cache.go:62 +0x71
  github.com/pingcap/tidb/session.(*session).loadCommonGlobalVariablesIfNeeded()
      session/session.go:3683 +0x11e
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2148 +0x16b
  github.com/pingcap/tidb/session.(*session).ExecuteInternal()
      session/session.go:1678 +0x365
  github.com/pingcap/tidb/domain.(*Domain).LoadPrivilegeLoop()
      domain/domain.go:1393 +0x143
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3343 +0x76c
  github.com/pingcap/tidb/server.createTidbTestSuiteWithCfg()
      server/tidb_test.go:102 +0x219
  github.com/pingcap/tidb/server.createTidbTestSuite()
      server/tidb_test.go:91 +0xc5
  github.com/pingcap/tidb/server.TestProxyProtocolWithIpFallbackable()
      server/tidb_test.go:3125 +0x110
  testing.tRunner()
      GOROOT/src/testing/testing.go:1576 +0x216
  testing.(*T).Run.func1()
      GOROOT/src/testing/testing.go:1629 +0x4