DATA RACE in the oomCapture

[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 0x00c00116a900 by goroutine 47396:
  github.com/pingcap/tidb/util/set.StringSet.Empty()
      util/set/string_set.go:60 +0x1c4
  executor/test/oomtest/oomtest_test.(*oomCapture).Write()
      executor/test/oomtest/oom_test.go:269 +0x16f
  go.uber.org/zap/zapcore.(*CheckedEntry).Write()
      external/org_uber_go_zap/zapcore/entry.go:255 +0x2ce
  go.uber.org/zap.(*Logger).Info()
      external/org_uber_go_zap/logger.go:220 +0x6a
  github.com/pingcap/tidb/domain/infosync.SetTiFlashGroupConfig()
      domain/infosync/info.go:1149 +0xce
  github.com/pingcap/tidb/ddl.(*ddl).PollTiFlashRoutine()
      ddl/ddl_tiflash_api.go:579 +0x519
  github.com/pingcap/tidb/ddl.(*ddl).PollTiFlashRoutine-fm()
      <autogenerated>:1 +0x39
  github.com/pingcap/tidb/util.(*WaitGroupWrapper).Run.func1()
      util/wait_group_wrapper.go:154 +0x87
Previous write at 0x00c00116a900 by goroutine 113:
  runtime.mapassign_faststr()
      GOROOT/src/runtime/map_faststr.go:203 +0x0
  github.com/pingcap/tidb/util/set.StringSet.Insert()
      util/set/string_set.go:39 +0xc7
  executor/test/oomtest/oomtest_test.(*oomCapture).AddMessageFilter()
      executor/test/oomtest/oom_test.go:227 +0x65
  executor/test/oomtest/oomtest_test.TestMemTracker4InsertAndReplaceExec()
      executor/test/oomtest/oom_test.go:138 +0xa77
  github.com/pingcap/tidb/session.bootstrapSessionImpl()
      session/session.go:3379 +0x7cc
  github.com/pingcap/tidb/domain.(*Domain).GetSessionCache()
      domain/sysvar_cache.go:62 +0x71
  github.com/pingcap/tidb/session.(*session).loadCommonGlobalVariablesIfNeeded()
      session/session.go:3743 +0x11e
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2152 +0x16b
  github.com/pingcap/tidb/session.(*session).ExecuteInternal()
      session/session.go:1666 +0x365
  github.com/pingcap/tidb/domain.(*Domain).LoadPrivilegeLoop()
      domain/domain.go:1832 +0x143
  github.com/pingcap/tidb/session.bootstrapSessionImpl()
      session/session.go:3372 +0x76c
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3293 +0x4e
  github.com/pingcap/tidb/testkit.bootstrap()
      testkit/mockstore.go:227 +0x84
  github.com/pingcap/tidb/testkit.CreateMockStoreAndDomain()
      testkit/mockstore.go:200 +0xd0
  github.com/pingcap/tidb/testkit.CreateMockStore()
      testkit/mockstore.go:68 +0x3b2
  executor/test/oomtest/oomtest_test.TestMemTracker4InsertAndReplaceExec()
      executor/test/oomtest/oom_test.go:71 +0x4f
  testing.tRunner()
      GOROOT/src/testing/testing.go:1576 +0x216
  testing.(*T).Run.func1()
      GOROOT/src/testing/testing.go:1629 +0x47
Goroutine 47396 (running) created at:
  github.com/pingcap/tidb/util.(*WaitGroupWrapper).Run()
      util/wait_group_wrapper.go:152 +0xf6
  github.com/pingcap/tidb/ddl.(*ddl).Start()
      ddl/ddl.go:802 +0xb79
  github.com/pingcap/tidb/domain.(*Domain).Init()
      domain/domain.go:1209 +0x1319
  github.com/pingcap/tidb/session.(*domainMap).Get.func1()
      session/tidb.go:93 +0x67c
  github.com/pingcap/tidb/util.RunWithRetry()
      util/misc.go:69 +0xbe
  github.com/pingcap/tidb/session.(*domainMap).Get()
      session/tidb.go:79 +0x2f8
  github.com/pingcap/tidb/session.createSessionWithOpt()
      session/session.go:3600 +0x86
  github.com/pingcap/tidb/session.createSession()
      session/session.go:3592 +0x49
  github.com/pingcap/tidb/session.createSessionsImpl()
      session/session.go:3577 +0xa1
  github.com/pingcap/tidb/session.createSessions()
      session/session.go:3564 +0x64
  github.com/pingcap/tidb/session.bootstrapSessionImpl()
      session/session.go:3339 +0x45d
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3293 +0x4e
  github.com/pingcap/tidb/testkit.bootstrap()
      testkit/mockstore.go:227 +0x84
  github.com/pingcap/tidb/testkit.CreateMockStoreAndDomain()
      testkit/mockstore.go:200 +0xd0
  github.com/pingcap/tidb/testkit.CreateMockStore()
      testkit/mockstore.go:68 +0x3b2
  executor/test/oomtest/oomtest_test.TestMemTracker4InsertAndReplaceExec()
      executor/test/oomtest/oom_test.go:71 +0x4f
  testing.tRunner()
      GOROOT/src/testing/testing.go:1576 +0x216
  testing.(*T).Run.func1()
      GOROOT/src/testing/testing.go:1629 +0x47
Goroutine 113 (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
  executor/test/oomtest/oomtest_test.TestMain()
      executor/test/oomtest/oom_test.go:44 +0x326
  main.main()
      bazel-out/k8-fastbuild/bin/executor/test/oomtest/oomtest_test_/testmain.go:127 +0x7ce
================== 

4. What is your TiDB version? (Required)