invalid memory address in the addindex_test

[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=0x10 pc=0x4739c0e]


goroutine 1874953 [running]:

github.com/pingcap/tidb/pkg/lightning/backend.(*ClosedEngine).Cleanup(0x0, {0x6f945f8, 0xc04092c460})

	pkg/lightning/backend/backend.go:405 +0x2e

github.com/pingcap/tidb/pkg/ddl/ingest.(*litBackendCtx).unsafeImportAndReset(0xc040bddb90, 0xc057f1f5f0)

	pkg/ddl/ingest/backend.go:289 +0x666

github.com/pingcap/tidb/pkg/ddl/ingest.(*litBackendCtx).Flush(0xc040bddb90, 0xa0?)

	pkg/ddl/ingest/backend.go:250 +0x875

github.com/pingcap/tidb/pkg/ddl.(*indexWriteResultSink).flush(0xc057f54790)

	pkg/ddl/backfilling_operators.go:825 +0xb3

github.com/pingcap/tidb/pkg/ddl.(*indexWriteResultSink).collectResult(0xc057f54790)

	pkg/ddl/backfilling_operators.go:804 +0x18f

golang.org/x/sync/errgroup.(*Group).Go.func1()

	external/org_golang_x_sync/errgroup/errgroup.go:78 +0x56

created by golang.org/x/sync/errgroup.(*Group).Go in goroutine 1855725

	external/org_golang_x_sync/errgroup/errgroup.go:75 +0x96

https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftidb%2Fghpr_check2/detail/ghpr_check2/10414/pipeline

4. What is your TiDB version? (Required)

[tangenta]

This issue should have been fixed by #53233.

[tangenta]

This is introduced by #53233 and not merged to v8.1, so we should remove the tag 'affects-8.1'.