DATA RACE in the TestSimpleRestorerImportAndProgress

[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 0x00c000f78108 by goroutine 67:
  br/pkg/restore/restore_test_test.TestSimpleRestorerImportAndProgress.func2()
      br/pkg/restore/restorer_test.go:69 +0x2f
  github.com/pingcap/tidb/br/pkg/restore.(*SimpleRestorer).GoRestore.func1.1()
      br/pkg/restore/restorer.go:198 +0x331
  runtime.deferreturn()
      GOROOT/src/runtime/panic.go:605 +0x5d
  github.com/pingcap/tidb/pkg/util.(*WorkerPool).ApplyOnErrorGroup.func1()
      pkg/util/worker_pool.go:81 +0xba
  golang.org/x/sync/errgroup.(*Group).Go.func1()
      external/org_golang_x_sync/errgroup/errgroup.go:78 +0x91
Previous write at 0x00c000f78108 by goroutine 68:
  br/pkg/restore/restore_test_test.TestSimpleRestorerImportAndProgress.func2()
      br/pkg/restore/restorer_test.go:69 +0x46
  github.com/pingcap/tidb/br/pkg/restore.(*SimpleRestorer).GoRestore.func1.1()
      br/pkg/restore/restorer.go:198 +0x331
  runtime.deferreturn()
      GOROOT/src/runtime/panic.go:605 +0x5d
  github.com/pingcap/tidb/pkg/util.(*WorkerPool).ApplyOnErrorGroup.func1()
      pkg/util/worker_pool.go:81 +0xba
  golang.org/x/sync/errgroup.(*Group).Go.func1()
      external/org_golang_x_sync/errgroup/errgroup.go:78 +0x91
Goroutine 67 (running) created at:
  golang.org/x/sync/errgroup.(*Group).Go()
      external/org_golang_x_sync/errgroup/errgroup.go:75 +0x124
  github.com/pingcap/tidb/pkg/util.(*WorkerPool).ApplyOnErrorGroup()
      pkg/util/worker_pool.go:79 +0x129
  github.com/pingcap/tidb/br/pkg/restore.(*SimpleRestorer).GoRestore()
      br/pkg/restore/restorer.go:190 +0x104
  br/pkg/restore/restore_test_test.TestSimpleRestorerImportAndProgress()
      br/pkg/restore/restorer_test.go:68 +0x81a
  testing.tRunner()
      GOROOT/src/testing/testing.go:1690 +0x226
  testing.(*T).Run.gowrap1()
      GOROOT/src/testing/testing.go:1743 +0x44
Goroutine 68 (finished) created at:
  golang.org/x/sync/errgroup.(*Group).Go()
      external/org_golang_x_sync/errgroup/errgroup.go:75 +0x124
  github.com/pingcap/tidb/pkg/util.(*WorkerPool).ApplyOnErrorGroup()
      pkg/util/worker_pool.go:79 +0x129
  github.com/pingcap/tidb/br/pkg/restore.(*SimpleRestorer).GoRestore()
      br/pkg/restore/restorer.go:190 +0x104
  br/pkg/restore/restore_test_test.TestSimpleRestorerImportAndProgress()
      br/pkg/restore/restorer_test.go:68 +0x81a
  testing.tRunner()
      GOROOT/src/testing/testing.go:1690 +0x226
  testing.(*T).Run.gowrap1()
      GOROOT/src/testing/testing.go:1743 +0x44
==================
--- FAIL: TestSimpleRestorerImportAndProgress (0.06s)
    testing.go:1399: race detected during execution of test
FAIL

4. What is your TiDB version? (Required)

[hawkingrei]

https://tiprow.hawkingrei.com/view/gs/pingcapprow/logs/tidb_data_race/1861633706834268160#1:build-log.txt%3A4852