panic in the TestRenameTableIntermediateState

[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)

panic: runtime error: invalid memory address or nil pointer dereference

[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x4ac79d1]


goroutine 383949 [running]:

github.com/pingcap/tidb/ddl_test.TestRenameTableIntermediateState.func1(0xc09119a160?)

	ddl/table_test.go:559 +0xb1

github.com/pingcap/tidb/ddl/internal/callback.(*TestDDLCallback).OnJobUpdated(0xc090cf7080, 0xc09119a160?)

	ddl/internal/callback/callback.go:122 +0x1ea

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

	ddl/job_table.go:451 +0xdef

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

	util/wait_group_wrapper.go:154 +0x6b

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

	util/wait_group_wrapper.go:152 +0x8d

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https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftidb%2Fghpr_unit_test/detail/ghpr_unit_test/24468/pipeline

4. What is your TiDB version? (Required)