DATA RACE in the MockInfoCacheAndLoadInfoSchema

[hawkingrei]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

==================
WARNING: DATA RACE
Write at 0x00c01c3cde10 by goroutine 15040:
  github.com/pingcap/tidb/domain.(*Domain).MockInfoCacheAndLoadInfoSchema()
      domain/test_helper.go:29 +0x124
  github.com/pingcap/tidb/br/pkg/restore_test.TestGetExistedUserDBs()
      br/pkg/restore/db_test.go:398 +0x9a4
  github.com/pingcap/tidb/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      sessionctx/variable/variable.go:361 +0x213
  github.com/pingcap/tidb/domain.(*Domain).rebuildSysVarCache()
      domain/sysvar_cache.go:146 +0x73c
  github.com/pingcap/tidb/domain.(*Domain).LoadSysVarCacheLoop()
      domain/domain.go:1361 +0xb9
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3313 +0x78c
  github.com/pingcap/tidb/domain.(*Domain).GetSessionCache()
      domain/sysvar_cache.go:62 +0x6a
  github.com/pingcap/tidb/session.(*session).loadCommonGlobalVariablesIfNeeded()
      session/session.go:3582 +0x11e
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2126 +0x2fb
  github.com/pingcap/tidb/session.(*session).ExecuteInternal()
      session/session.go:1674 +0x4eb
  github.com/pingcap/tidb/domain.(*Domain).LoadPrivilegeLoop()
      domain/domain.go:1303 +0x143
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3306 +0x72c
  github.com/pingcap/tidb/br/pkg/mock.NewCluster()
      br/pkg/mock/mock_cluster.go:75 +0x244
  github.com/pingcap/tidb/br/pkg/restore_test.TestGetExistedUserDBs()
      br/pkg/restore/db_test.go:371 +0x44
  testing.tRunner()
      GOROOT/src/testing/testing.go:1446 +0x216
  testing.(*T).Run.func1()
      GOROOT/src/testing/testing.go:1493 +0x47

Previous read at 0x00c01c3cde10 by goroutine 36089:
  github.com/pingcap/tidb/domain.(*Domain).InfoSchema()
      domain/domain.go:373 +0x48
  github.com/pingcap/tidb/session.(*session).GetDomainInfoSchema()
      session/session.go:3901 +0x4d
  github.com/pingcap/tidb/sessiontxn/isolation.(*baseTxnContextProvider).OnInitialize()
      sessiontxn/isolation/base.go:110 +0x57c
  github.com/pingcap/tidb/sessiontxn/isolation.(*OptimisticTxnContextProvider).OnInitialize()
      <autogenerated>:1 +0x64
  github.com/pingcap/tidb/session.(*txnManager).EnterNewTxn()
      session/txnmanager.go:147 +0xa7
  github.com/pingcap/tidb/session.(*session).PrepareTxnCtx()
      session/session.go:3627 +0x81b
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2122 +0x2d4
  github.com/pingcap/tidb/session.(*session).ExecuteInternal()
      session/session.go:1674 +0x4eb
  github.com/pingcap/tidb/ddl.(*session).execute()
      ddl/ddl.go:1789 +0x20e
  github.com/pingcap/tidb/ddl.(*ddl).getJob()
      ddl/job_table.go:98 +0x1f9
  github.com/pingcap/tidb/ddl.(*ddl).getGeneralJob()
      ddl/job_table.go:128 +0x77
  github.com/pingcap/tidb/ddl.(*ddl).getGeneralJob-fm()
      <autogenerated>:1 +0x44
  github.com/pingcap/tidb/ddl.(*ddl).loadDDLJobAndRun()
      ddl/job_table.go:210 +0x3e4
  github.com/pingcap/tidb/ddl.(*ddl).startDispatchLoop()
      ddl/job_table.go:194 +0x92d
  github.com/pingcap/tidb/ddl.(*ddl).startDispatchLoop-fm()
      <autogenerated>:1 +0x39
  github.com/pingcap/tidb/util.(*WaitGroupWrapper).Run.func1()
      util/wait_group_wrapper.go:33 +0x87

Goroutine 15040 (running) created at:
  testing.(*T).Run()
      GOROOT/src/testing/testing.go:1493 +0x75d
  testing.runTests.func1()
      GOROOT/src/testing/testing.go:1846 +0x99
  testing.tRunner()
      GOROOT/src/testing/testing.go:1446 +0x216
  testing.runTests()
      GOROOT/src/testing/testing.go:1844 +0x7ec
  testing.(*M).Run()
      GOROOT/src/testing/testing.go:1726 +0xa84
  github.com/pingcap/tidb/br/pkg/restore_test.TestMain()
      br/pkg/restore/main_test.go:46 +0x5fd
  github.com/pingcap/tidb/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      sessionctx/variable/variable.go:361 +0x213
  github.com/pingcap/tidb/domain.(*Domain).rebuildSysVarCache()
      domain/sysvar_cache.go:146 +0x73c
  github.com/pingcap/tidb/domain.(*Domain).LoadSysVarCacheLoop()
      domain/domain.go:1361 +0xb9
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3313 +0x78c
  github.com/pingcap/tidb/domain.(*Domain).GetSessionCache()
      domain/sysvar_cache.go:62 +0x6a
  github.com/pingcap/tidb/session.(*session).loadCommonGlobalVariablesIfNeeded()
      session/session.go:3582 +0x11e
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2126 +0x2fb
  github.com/pingcap/tidb/session.(*session).ExecuteInternal()
      session/session.go:1674 +0x4eb
  github.com/pingcap/tidb/domain.(*Domain).LoadPrivilegeLoop()
      domain/domain.go:1303 +0x143
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3306 +0x72c
  github.com/pingcap/tidb/br/pkg/mock.NewCluster()
      br/pkg/mock/mock_cluster.go:75 +0x244
  github.com/pingcap/tidb/br/pkg/restore_test.TestMain()
      br/pkg/restore/main_test.go:38 +0x56c
  main.main()
      bazel-out/k8-fastbuild/bin/br/pkg/restore/restore_test_/testmain.go:300 +0x7c9

Goroutine 36089 (running) created at:
  github.com/pingcap/tidb/util.(*WaitGroupWrapper).Run()
      util/wait_group_wrapper.go:31 +0xf6
  github.com/pingcap/tidb/ddl.(*ddl).prepareWorkers4ConcurrencyDDL()
      ddl/ddl.go:679 +0x366
  github.com/pingcap/tidb/ddl.(*ddl).Start()
      ddl/ddl.go:715 +0x5e9
  github.com/pingcap/tidb/domain.(*Domain).Init()
      domain/domain.go:1032 +0x1492
  github.com/pingcap/tidb/session.(*domainMap).Get.func1()
      session/tidb.go:93 +0x76d
  github.com/pingcap/tidb/util.RunWithRetry()
      util/misc.go:69 +0xbe
  github.com/pingcap/tidb/session.(*domainMap).Get()
      session/tidb.go:76 +0x290
  github.com/pingcap/tidb/session.createSessionWithOpt()
      session/session.go:3459 +0x86
  github.com/pingcap/tidb/session.createSession()
      session/session.go:3455 +0x49
  github.com/pingcap/tidb/session.createSessions()
      session/session.go:3440 +0x9a
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3273 +0x415
  github.com/pingcap/tidb/br/pkg/mock.NewCluster()
      br/pkg/mock/mock_cluster.go:75 +0x244
  github.com/pingcap/tidb/br/pkg/restore_test.TestGetExistedUserDBs()
      br/pkg/restore/db_test.go:371 +0x44
  testing.tRunner()
      GOROOT/src/testing/testing.go:1446 +0x216
  testing.(*T).Run.func1()
      GOROOT/src/testing/testing.go:1493 +0x47
==================

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

3. What did you see instead (Required)

4. What is your TiDB version? (Required)