==================
WARNING: DATA RACE
Read at 0x00c0048daa68 by goroutine 144456:
  github.com/pingcap/tidb/util/chunk.(*allocator).Alloc()
      util/chunk/alloc.go:96 +0x75
  github.com/pingcap/tidb/sessionctx/variable.(*SessionVars).GetNewChunkWithCapacity()
      sessionctx/variable/session.go:1384 +0x1e3
  github.com/pingcap/tidb/executor.tryNewCacheChunk()
      executor/executor.go:238 +0x124
  github.com/pingcap/tidb/executor.(*ExecStmt).handleNoDelayExecutor()
      executor/adapter.go:950 +0x6c4
  github.com/pingcap/tidb/executor.(*ExecStmt).handleNoDelay()
      executor/adapter.go:779 +0x34a
  github.com/pingcap/tidb/executor.(*ExecStmt).Exec()
      executor/adapter.go:574 +0x1299
  github.com/pingcap/tidb/session.runStmt()
      session/session.go:2351 +0x761
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2215 +0xfa5
  github.com/pingcap/tidb/testkit.(*TestKit).ExecWithContext()
      testkit/testkit.go:321 +0x96e
  github.com/pingcap/tidb/testkit.(*TestKit).Exec()
      testkit/testkit.go:294 +0x1d4
  ddl/indexmergetest/indexmergetest_test.TestAddIndexMergeConflictWithPessimistic.func1()
      ddl/indexmergetest/merge_test.go:499 +0x19b
  github.com/pingcap/tidb/ddl/internal/callback.(*TestDDLCallback).OnJobRunBefore()
      ddl/internal/callback/callback.go:95 +0x202
  github.com/pingcap/tidb/ddl.(*worker).HandleDDLJobTable()
      ddl/ddl_worker.go:755 +0x5f4
  github.com/pingcap/tidb/ddl.(*ddl).delivery2worker.func1()
      ddl/job_table.go:271 +0xb45
  github.com/pingcap/tidb/util.(*WaitGroupWrapper).Run.func1()
      util/wait_group_wrapper.go:154 +0x73
Previous write at 0x00c0048daa68 by goroutine 130397:
  github.com/pingcap/tidb/util/chunk.(*allocator).Reset()
      util/chunk/alloc.go:125 +0x2f5
  github.com/pingcap/tidb/testkit.(*TestKit).MustExec.func1()
      testkit/testkit.go:122 +0x67
  runtime.deferreturn()
      GOROOT/src/runtime/panic.go:476 +0x32
  ddl/indexmergetest/indexmergetest_test.TestAddIndexMergeConflictWithPessimistic()
      ddl/indexmergetest/merge_test.go:518 +0x629
  github.com/pingcap/tidb/session.runStmt()
      session/session.go:2351 +0x761
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2215 +0xfa5
  github.com/pingcap/tidb/testkit.(*TestKit).ExecWithContext()
      testkit/testkit.go:321 +0x96e
  github.com/pingcap/tidb/testkit.(*TestKit).MustExecWithContext()
      testkit/testkit.go:130 +0xb7
  github.com/pingcap/tidb/testkit.(*TestKit).MustExec()
      testkit/testkit.go:125 +0xf7
  ddl/indexmergetest/indexmergetest_test.TestAddIndexMergeConflictWithPessimistic()
      ddl/indexmergetest/merge_test.go:475 +0x171
  github.com/pingcap/tidb/session.runStmt()
      session/session.go:2351 +0x761
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2215 +0xfa5
  github.com/pingcap/tidb/testkit.(*TestKit).ExecWithContext()
      testkit/testkit.go:321 +0x96e
  github.com/pingcap/tidb/testkit.(*TestKit).MustExecWithContext()
      testkit/testkit.go:130 +0xb7
  github.com/pingcap/tidb/testkit.(*TestKit).MustExec()
      testkit/testkit.go:125 +0xf7
  ddl/indexmergetest/indexmergetest_test.TestAddIndexMergeConflictWithPessimistic()
      ddl/indexmergetest/merge_test.go:474 +0x154
  github.com/pingcap/tidb/domain.(*Domain).rebuildSysVarCache()
      domain/sysvar_cache.go:146 +0x844
  github.com/pingcap/tidb/domain.(*Domain).LoadSysVarCacheLoop()
      domain/domain.go:1384 +0xa8
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3337 +0x693
  github.com/pingcap/tidb/domain.(*Domain).GetSessionCache()
      domain/sysvar_cache.go:62 +0x59
  github.com/pingcap/tidb/session.(*session).loadCommonGlobalVariablesIfNeeded()
      session/session.go:3656 +0x104
  github.com/pingcap/tidb/session.(*session).ExecuteStmt()
      session/session.go:2134 +0x2a5
  github.com/pingcap/tidb/session.(*session).ExecuteInternal()
      session/session.go:1668 +0x471
  github.com/pingcap/tidb/domain.(*Domain).LoadPrivilegeLoop()
      domain/domain.go:1328 +0x130
  github.com/pingcap/tidb/session.BootstrapSession()
      session/session.go:3330 +0x644
  github.com/pingcap/tidb/testkit.bootstrap()
      testkit/mockstore.go:85 +0xac
  github.com/pingcap/tidb/testkit.CreateMockStoreAndDomain()
      testkit/mockstore.go:70 +0xe9
  ddl/indexmergetest/indexmergetest_test.TestAddIndexMergeConflictWithPessimistic()
      ddl/indexmergetest/merge_test.go:464 +0x58
  testing.tRunner()
      GOROOT/src/testing/testing.go:1446 +0x216
  testing.(*T).Run.func1()
      GOROOT/src/testing/testing.go:1493 +0x47
Goroutine 144456 (running) created at:
  github.com/pingcap/tidb/util.(*WaitGroupWrapper).Run()
      util/wait_group_wrapper.go:152 +0xe4
  github.com/pingcap/tidb/ddl.(*ddl).delivery2worker()
      ddl/job_table.go:230 +0x1b7
  github.com/pingcap/tidb/ddl.(*ddl).loadDDLJobAndRun()
      ddl/job_table.go:223 +0x57c
  github.com/pingcap/tidb/ddl.(*ddl).startDispatchLoop()
      ddl/job_table.go:196 +0xad1
  github.com/pingcap/tidb/ddl.(*ddl).startDispatchLoop-fm()
      <autogenerated>:1 +0x39
  github.com/pingcap/tidb/util.(*WaitGroupWrapper).Run.func1()
      util/wait_group_wrapper.go:154 +0x73
Goroutine 130397 (running) created at:
  testing.(*T).Run()
      GOROOT/src/testing/testing.go:1493 +0x75d
  testing.runTests.func1()
      GOROOT/src/testing/testing.go:1846 +0x99
  testing.tRunner()
      GOROOT/src/testing/testing.go:1446 +0x216
  testing.runTests()
      GOROOT/src/testing/testing.go:1844 +0x7ec
  testing.(*M).Run()
      GOROOT/src/testing/testing.go:1726 +0xa84
  go.uber.org/goleak.VerifyTestMain()
      external/org_uber_go_goleak/testmain.go:53 +0x70
  ddl/indexmergetest/indexmergetest_test.TestMain()
      ddl/indexmergetest/main_test.go:55 +0x5c4
  main.main()
      bazel-out/k8-fastbuild/bin/ddl/indexmergetest/indexmergetest_test_/testmain.go:120 +0x5e8
==================