DATA RACE in the TestInitStatsVer2

[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
Write at 0x00c007b7ea33 by goroutine 48:
  github.com/pingcap/tidb/session.(*session).ExecuteInternal()
      session/session.go:1612 +0x118
  github.com/pingcap/tidb/statistics/handle.(*Handle).initTopNCountSum()
      statistics/handle/bootstrap.go:343 +0x205
  github.com/pingcap/tidb/statistics/handle.(*Handle).initStatsHistograms4Chunk()
      statistics/handle/bootstrap.go:146 +0xb7a
  github.com/pingcap/tidb/statistics/handle.(*Handle).initStatsHistograms()
      statistics/handle/bootstrap.go:187 +0x2a4
  github.com/pingcap/tidb/statistics/handle.(*Handle).InitStats()
      statistics/handle/bootstrap.go:420 +0x275
  statistics/handle/handletest/handletest_test.TestInitStatsVer2()
      statistics/handle/handletest/handle_test.go:478 +0x264
  github.com/pingcap/tidb/domain.(*Domain).rebuildSysVarCache()
      domain/sysvar_cache.go:146 +0x8c4
  github.com/pingcap/tidb/domain.(*Domain).LoadSysVarCacheLoop()
      domain/domain.go:1470 +0xa8
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3314 +0x6d3
  github.com/pingcap/tidb/domain.(*Domain).GetSessionCache()
      domain/sysvar_cache.go:62 +0x5c
  github.com/pingcap/tidb/session.(*session).loadCommonGlobalVariablesIfNeeded()
      session/session.go:3656 +0x104
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2093 +0x145
  github.com/pingcap/tidb/session.(*session).ExecuteInternal()
      session/session.go:1628 +0x31b
  github.com/pingcap/tidb/domain.(*Domain).LoadPrivilegeLoop()
      domain/domain.go:1414 +0x130
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3307 +0x684
  github.com/pingcap/tidb/testkit.bootstrap()
      testkit/mockstore.go:85 +0xac
  github.com/pingcap/tidb/testkit.CreateMockStoreAndDomain()
      testkit/mockstore.go:70 +0xe9
  statistics/handle/handletest/handletest_test.TestInitStatsVer2()
      statistics/handle/handletest/handle_test.go:462 +0x58
  testing.tRunner()
      GOROOT/src/testing/testing.go:1576 +0x216
  testing.(*T).Run.func1()
      GOROOT/src/testing/testing.go:1629 +0x47
Previous read at 0x00c007b7ea33 by goroutine 30154:
  github.com/pingcap/tidb/distsql.(*selectResult).fetchResp.func1()
      distsql/select_result.go:165 +0x90
  runtime.deferreturn()
      GOROOT/src/runtime/panic.go:476 +0x32
  github.com/pingcap/tidb/distsql.(*selectResult).Next()
      distsql/select_result.go:262 +0x198
  github.com/pingcap/tidb/executor.(*tableResultHandler).nextChunk()
      executor/table_reader.go:516 +0x1a5
  github.com/pingcap/tidb/executor.(*TableReaderExecutor).Next()
      executor/table_reader.go:255 +0x350
  github.com/pingcap/tidb/executor.Next()
      executor/executor.go:324 +0x326
  github.com/pingcap/tidb/executor.(*projectionInputFetcher).run()
      executor/projection.go:388 +0x5e4
  github.com/pingcap/tidb/executor.(*ProjectionExec).prepare.func1()
      executor/projection.go:277 +0x58
Goroutine 48 (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
  statistics/handle/handletest/handletest_test.TestMain()
      statistics/handle/handletest/main_test.go:32 +0x435
  main.main()
      bazel-out/k8-fastbuild/bin/statistics/handle/handletest/handletest_test_/testmain.go:246 +0x5e8
Goroutine 30154 (finished) created at:
  github.com/pingcap/tidb/executor.(*ProjectionExec).prepare()
      executor/projection.go:277 +0xd59
  github.com/pingcap/tidb/executor.(*ProjectionExec).parallelExecute()
      executor/projection.go:212 +0xd6
  github.com/pingcap/tidb/executor.(*ProjectionExec).Next()
      executor/projection.go:185 +0xcc
  github.com/pingcap/tidb/executor.Next()
      executor/executor.go:324 +0x326
  github.com/pingcap/tidb/executor.(*ExecStmt).next()
      executor/adapter.go:1211 +0x89
  github.com/pingcap/tidb/executor.(*recordSet).Next()
      executor/adapter.go:149 +0x164
  github.com/pingcap/tidb/session.(*execStmtResult).Next()
      <autogenerated>:1 +0x76
  github.com/pingcap/tidb/statistics/handle.(*Handle).initStatsHistograms()
      statistics/handle/bootstrap.go:180 +0x2d5
  github.com/pingcap/tidb/statistics/handle.(*Handle).InitStats()
      statistics/handle/bootstrap.go:420 +0x275
  statistics/handle/handletest/handletest_test.TestInitStatsVer2()
      statistics/handle/handletest/handle_test.go:478 +0x264
  github.com/pingcap/tidb/domain.(*Domain).rebuildSysVarCache()
      domain/sysvar_cache.go:146 +0x8c4
  github.com/pingcap/tidb/domain.(*Domain).LoadSysVarCacheLoop()
      domain/domain.go:1470 +0xa8
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3314 +0x6d3
  github.com/pingcap/tidb/domain.(*Domain).GetSessionCache()
      domain/sysvar_cache.go:62 +0x5c
  github.com/pingcap/tidb/session.(*session).loadCommonGlobalVariablesIfNeeded()
      session/session.go:3656 +0x104
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2093 +0x145
  github.com/pingcap/tidb/session.(*session).ExecuteInternal()
      session/session.go:1628 +0x31b
  github.com/pingcap/tidb/domain.(*Domain).LoadPrivilegeLoop()
      domain/domain.go:1414 +0x130
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3307 +0x684
  github.com/pingcap/tidb/testkit.bootstrap()
      testkit/mockstore.go:85 +0xac
  github.com/pingcap/tidb/testkit.CreateMockStoreAndDomain()
      testkit/mockstore.go:70 +0xe9
  statistics/handle/handletest/handletest_test.TestInitStatsVer2()
      statistics/handle/handletest/handle_test.go:462 +0x58
  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)

[tangenta]

Reopen this because #42123 is reverted by #42542.