datarace at (*Domain).InitDistTaskLoop()

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)


```
==================
WARNING: DATA RACE
Read at 0x00c00708ea00 by main goroutine:
  github.com/pingcap/tidb/pkg/domain.(*Domain).InitDistTaskLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:1592 +0x264
  github.com/pingcap/tidb/pkg/session.bootstrapSessionImpl()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3614 +0x1780
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:146 +0x638
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func208()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:1095 +0x48
  github.com/pingcap/tidb/pkg/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/variable.go:365 +0x170
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:145 +0x5e4
  github.com/pingcap/tidb/pkg/sessionctx/variable.parseSchemaCacheSize()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/varsutil.go:607 +0xe0
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func598()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:3156 +0x40
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:146 +0x638
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func597()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:3148 +0x48
  github.com/pingcap/tidb/pkg/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/variable.go:365 +0x170
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:145 +0x5e4
  github.com/pingcap/tidb/pkg/domain.(*Domain).LoadSysVarCacheLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:1832 +0x6c
  github.com/pingcap/tidb/pkg/session.bootstrapSessionImpl()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3477 +0x620
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func209()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:1102 +0x40
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:146 +0x638
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func208()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:1095 +0x48
  github.com/pingcap/tidb/pkg/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/variable.go:365 +0x170
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:145 +0x5e4
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCacheIfNeeded()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:50 +0x110
  github.com/pingcap/tidb/pkg/domain.(*Domain).GetSessionCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:61 +0x38
  github.com/pingcap/tidb/pkg/session.(*session).loadCommonGlobalVariablesIfNeeded()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3849 +0x204
  github.com/pingcap/tidb/pkg/session.(*session).ExecuteStmt()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:2012 +0xf4
  github.com/pingcap/tidb/pkg/session.(*session).ExecuteInternal()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:1523 +0x23c
  github.com/pingcap/tidb/pkg/domain.(*Domain).LoadPrivilegeLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:1775 +0xe0
  github.com/pingcap/tidb/pkg/session.bootstrapSessionImpl()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3470 +0x5ec
  github.com/pingcap/tidb/pkg/session.BootstrapSession()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3369 +0x23c
  main.createStoreAndDomain()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/cmd/tidb-server/main.go:420 +0x228
  main.main()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/cmd/tidb-server/main.go:326 +0x7d4

Previous write at 0x00c00708ea00 by goroutine 3284:
  github.com/pingcap/tidb/pkg/domain.(*Domain).loadStatsWorker()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:2453 +0x1b0
  github.com/pingcap/tidb/pkg/domain.(*Domain).loadStatsWorker-fm()
      <autogenerated>:1 +0x34
  github.com/pingcap/tidb/pkg/util.(*WaitGroupEnhancedWrapper).Run.func1()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/util/wait_group_wrapper.go:99 +0xa8

Goroutine 3284 (running) created at:
  github.com/pingcap/tidb/pkg/util.(*WaitGroupEnhancedWrapper).Run()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/util/wait_group_wrapper.go:94 +0x12c
  github.com/pingcap/tidb/pkg/domain.(*Domain).UpdateTableStatsLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:2314 +0x23c
  github.com/pingcap/tidb/pkg/domain.(*Domain).LoadAndUpdateStatsLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:2293 +0x6c
  github.com/pingcap/tidb/pkg/session.bootstrapSessionImpl()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3566 +0x13b4
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:146 +0x638
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func208()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:1095 +0x48
  github.com/pingcap/tidb/pkg/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/variable.go:365 +0x170
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:145 +0x5e4
  github.com/pingcap/tidb/pkg/sessionctx/variable.parseSchemaCacheSize()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/varsutil.go:607 +0xe0
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func598()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:3156 +0x40
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:146 +0x638
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func597()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:3148 +0x48
  github.com/pingcap/tidb/pkg/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/variable.go:365 +0x170
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:145 +0x5e4
  github.com/pingcap/tidb/pkg/domain.(*Domain).LoadSysVarCacheLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:1832 +0x6c
  github.com/pingcap/tidb/pkg/session.bootstrapSessionImpl()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3477 +0x620
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func209()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:1102 +0x40
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:146 +0x638
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func208()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:1095 +0x48
  github.com/pingcap/tidb/pkg/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/variable.go:365 +0x170
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:145 +0x5e4
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCacheIfNeeded()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:50 +0x110
  github.com/pingcap/tidb/pkg/domain.(*Domain).GetSessionCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:61 +0x38
  github.com/pingcap/tidb/pkg/session.(*session).loadCommonGlobalVariablesIfNeeded()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3849 +0x204
  github.com/pingcap/tidb/pkg/session.(*session).ExecuteStmt()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:2012 +0xf4
  github.com/pingcap/tidb/pkg/session.(*session).ExecuteInternal()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:1523 +0x23c
  github.com/pingcap/tidb/pkg/domain.(*Domain).LoadPrivilegeLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:1775 +0xe0
  github.com/pingcap/tidb/pkg/session.bootstrapSessionImpl()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3470 +0x5ec
  github.com/pingcap/tidb/pkg/session.BootstrapSession()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3369 +0x23c
  main.createStoreAndDomain()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/cmd/tidb-server/main.go:420 +0x228
  main.main()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/cmd/tidb-server/main.go:326 +0x7d4
==================
==================
WARNING: DATA RACE
Read at 0x00c00807e608 by main goroutine:
  runtime.growslice()
      /opt/homebrew/opt/go/libexec/src/runtime/slice.go:157 +0x0
  github.com/pingcap/tidb/pkg/domain.(*Domain).InitDistTaskLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:1592 +0x298
  github.com/pingcap/tidb/pkg/session.bootstrapSessionImpl()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3614 +0x1780
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:146 +0x638
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func208()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:1095 +0x48
  github.com/pingcap/tidb/pkg/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/variable.go:365 +0x170
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:145 +0x5e4
  github.com/pingcap/tidb/pkg/sessionctx/variable.parseSchemaCacheSize()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/varsutil.go:607 +0xe0
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func598()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:3156 +0x40
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:146 +0x638
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func597()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:3148 +0x48
  github.com/pingcap/tidb/pkg/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/variable.go:365 +0x170
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:145 +0x5e4
  github.com/pingcap/tidb/pkg/domain.(*Domain).LoadSysVarCacheLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:1832 +0x6c
  github.com/pingcap/tidb/pkg/session.bootstrapSessionImpl()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3477 +0x620
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func209()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:1102 +0x40
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:146 +0x638
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func208()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:1095 +0x48
  github.com/pingcap/tidb/pkg/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/variable.go:365 +0x170
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:145 +0x5e4
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCacheIfNeeded()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:50 +0x110
  github.com/pingcap/tidb/pkg/domain.(*Domain).GetSessionCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:61 +0x38
  github.com/pingcap/tidb/pkg/session.(*session).loadCommonGlobalVariablesIfNeeded()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3849 +0x204
  github.com/pingcap/tidb/pkg/session.(*session).ExecuteStmt()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:2012 +0xf4
  github.com/pingcap/tidb/pkg/session.(*session).ExecuteInternal()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:1523 +0x23c
  github.com/pingcap/tidb/pkg/domain.(*Domain).LoadPrivilegeLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:1775 +0xe0
  github.com/pingcap/tidb/pkg/session.bootstrapSessionImpl()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3470 +0x5ec
  github.com/pingcap/tidb/pkg/session.BootstrapSession()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3369 +0x23c
  main.createStoreAndDomain()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/cmd/tidb-server/main.go:420 +0x228
  main.main()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/cmd/tidb-server/main.go:326 +0x7d4

Previous write at 0x00c00807e608 by goroutine 3284:
  github.com/pingcap/tidb/pkg/domain.(*Domain).loadStatsWorker()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:2453 +0x16c
  github.com/pingcap/tidb/pkg/domain.(*Domain).loadStatsWorker-fm()
      <autogenerated>:1 +0x34
  github.com/pingcap/tidb/pkg/util.(*WaitGroupEnhancedWrapper).Run.func1()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/util/wait_group_wrapper.go:99 +0xa8

Goroutine 3284 (running) created at:
  github.com/pingcap/tidb/pkg/util.(*WaitGroupEnhancedWrapper).Run()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/util/wait_group_wrapper.go:94 +0x12c
  github.com/pingcap/tidb/pkg/domain.(*Domain).UpdateTableStatsLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:2314 +0x23c
  github.com/pingcap/tidb/pkg/domain.(*Domain).LoadAndUpdateStatsLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:2293 +0x6c
  github.com/pingcap/tidb/pkg/session.bootstrapSessionImpl()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3566 +0x13b4
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:146 +0x638
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func208()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:1095 +0x48
  github.com/pingcap/tidb/pkg/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/variable.go:365 +0x170
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:145 +0x5e4
  github.com/pingcap/tidb/pkg/sessionctx/variable.parseSchemaCacheSize()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/varsutil.go:607 +0xe0
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func598()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:3156 +0x40
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:146 +0x638
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func597()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:3148 +0x48
  github.com/pingcap/tidb/pkg/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/variable.go:365 +0x170
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:145 +0x5e4
  github.com/pingcap/tidb/pkg/domain.(*Domain).LoadSysVarCacheLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:1832 +0x6c
  github.com/pingcap/tidb/pkg/session.bootstrapSessionImpl()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3477 +0x620
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func209()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:1102 +0x40
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:146 +0x638
  github.com/pingcap/tidb/pkg/sessionctx/variable.glob..func208()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/sysvar.go:1095 +0x48
  github.com/pingcap/tidb/pkg/sessionctx/variable.(*SysVar).ValidateWithRelaxedValidation()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/sessionctx/variable/variable.go:365 +0x170
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:145 +0x5e4
  github.com/pingcap/tidb/pkg/domain.(*Domain).rebuildSysVarCacheIfNeeded()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:50 +0x110
  github.com/pingcap/tidb/pkg/domain.(*Domain).GetSessionCache()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/sysvar_cache.go:61 +0x38
  github.com/pingcap/tidb/pkg/session.(*session).loadCommonGlobalVariablesIfNeeded()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3849 +0x204
  github.com/pingcap/tidb/pkg/session.(*session).ExecuteStmt()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:2012 +0xf4
  github.com/pingcap/tidb/pkg/session.(*session).ExecuteInternal()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:1523 +0x23c
  github.com/pingcap/tidb/pkg/domain.(*Domain).LoadPrivilegeLoop()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/domain/domain.go:1775 +0xe0
  github.com/pingcap/tidb/pkg/session.bootstrapSessionImpl()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3470 +0x5ec
  github.com/pingcap/tidb/pkg/session.BootstrapSession()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/pkg/session/session.go:3369 +0x23c
  main.createStoreAndDomain()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/cmd/tidb-server/main.go:420 +0x228
  main.main()
      /Users/arenatlx/go/src/github.com/pingcap/tidb/cmd/tidb-server/main.go:326 +0x7d4
==================
```

code
```
	do.cancelFns = append(do.cancelFns, cancel)
```
### 2. What did you expect to see? (Required)
no datarace

### 3. What did you see instead (Required)
datarace

### 4. What is your TiDB version? (Required)


156f23aacb99a78b324af2988fc6fba988738ca6 master

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Uh oh!

datarace at (*Domain).InitDistTaskLoop() #54690

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datarace at (*Domain).InitDistTaskLoop() #54690

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