DATA RACE at DDLSeqNum

[xhebox]

Bug Report

Looks like another bug like #32541. /cc @hawkingrei

1. Minimal reproduce step (Required)

https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftidb%2Fghpr_mysql_test/detail/ghpr_mysql_test/23001/pipeline/192

WARNING: DATA RACE

Read at 0x00c000d83b98 by goroutine 514:

  github.com/pingcap/tidb/ddl.(*worker).writeDDLSeqNum()

      /home/jenkins/agent/workspace/pingcap/tidb/ghpr_mysql_test/tidb/ddl/ddl_worker.go:617 +0x88

  github.com/pingcap/tidb/ddl.(*worker).finishDDLJob()

      /home/jenkins/agent/workspace/pingcap/tidb/ghpr_mysql_test/tidb/ddl/ddl_worker.go:609 +0x4bb

  github.com/pingcap/tidb/ddl.(*worker).HandleJobDone()

      /home/jenkins/agent/workspace/pingcap/tidb/ghpr_mysql_test/tidb/ddl/ddl_worker.go:707 +0x49

  github.com/pingcap/tidb/ddl.(*worker).HandleDDLJobTable()

      /home/jenkins/agent/workspace/pingcap/tidb/ghpr_mysql_test/tidb/ddl/ddl_worker.go:761 +0x490

  github.com/pingcap/tidb/ddl.(*ddl).delivery2worker.func1()

      /home/jenkins/agent/workspace/pingcap/tidb/ghpr_mysql_test/tidb/ddl/job_table.go:420 +0xb58

  github.com/pingcap/tidb/util.(*WaitGroupWrapper).Run.func1()

      /home/jenkins/agent/workspace/pingcap/tidb/ghpr_mysql_test/tidb/util/wait_group_wrapper.go:154 +0x73


Previous write at 0x00c000d83b98 by goroutine 353:

  github.com/pingcap/tidb/ddl.(*ddl).Start.func1()

      /home/jenkins/agent/workspace/pingcap/tidb/ghpr_mysql_test/tidb/ddl/ddl.go:758 +0x86

  github.com/pingcap/tidb/owner.(*mockManager).toBeOwner()

      /home/jenkins/agent/workspace/pingcap/tidb/ghpr_mysql_test/tidb/owner/mock.go:82 +0x36e

  github.com/pingcap/tidb/owner.(*mockManager).CampaignOwner.func1()

      /home/jenkins/agent/workspace/pingcap/tidb/ghpr_mysql_test/tidb/owner/mock.go:136 +0x511

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

[Defined2014]

fixed by #44536