DATA RACE at the regionJob.stage

[hawkingrei]

Bug Report

Please answer these questions before submitting your issue. Thanks!

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 0x00c000195078 by goroutine 48:
  github.com/pingcap/tidb/br/pkg/lightning/backend/local.TestCheckPeersBusy()
      br/pkg/lightning/backend/local/local_test.go:1285 +0x27fa
  testing.tRunner()
      GOROOT/src/testing/testing.go:1576 +0x216
  testing.(*T).Run.func1()
      GOROOT/src/testing/testing.go:1629 +0x47
Previous write at 0x00c000195078 by goroutine 60:
  github.com/pingcap/tidb/br/pkg/lightning/backend/local.(*regionJob).convertStageTo()
      br/pkg/lightning/backend/local/region_job.go:92 +0x68
  github.com/pingcap/tidb/br/pkg/lightning/backend/local.(*regionJob).writeToTiKV()
      br/pkg/lightning/backend/local/region_job.go:330 +0x4986
  github.com/pingcap/tidb/br/pkg/lightning/backend/local.(*local).executeJob()
      br/pkg/lightning/backend/local/local.go:1220 +0x364
  github.com/pingcap/tidb/br/pkg/lightning/backend/local.(*local).startWorker()
      br/pkg/lightning/backend/local/local.go:1159 +0x40d
  github.com/pingcap/tidb/br/pkg/lightning/backend/local.TestCheckPeersBusy.func3()
      br/pkg/lightning/backend/local/local_test.go:1275 +0xf2
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
  main.main()
      bazel-out/k8-fastbuild/bin/br/pkg/lightning/backend/local/local_test_/testmain.go:198 +0x5d0
Goroutine 60 (running) created at:
  github.com/pingcap/tidb/br/pkg/lightning/backend/local.TestCheckPeersBusy()
      br/pkg/lightning/backend/local/local_test.go:1273 +0x26c5
  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)

[lance6716]

Can you provide the CI link? I need the log to know if the sleep is too short or too long

[hawkingrei]

Can you provide the CI link? I need the log to know if the sleep is too short or too long

https://prow.hawkingrei.com/view/gs/prowpingcap/logs/tidb_race/1640942001295724544