Unstable test: TestUsingReorgCtx

[zimulala]

Bug Report

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1. Minimal reproduce step (Required)

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

[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x448b259]


goroutine 183764 [running]:

github.com/pingcap/tidb/ddl.(*reorgCtx).isReorgCanceled(...)

	ddl/reorg.go:113

github.com/pingcap/tidb/ddl.(*reorgCtx).IsReorgCanceled(...)

	ddl/ddl_test.go:62

github.com/pingcap/tidb/ddl_test.TestUsingReorgCtx.func2()

	ddl/ddl_worker_test.go:334 +0xd9

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

--

Coverage runner: Not collecting coverage for failed test.

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

3. What did you see instead (Required)

4. What is your TiDB version? (Required)