TestAddIndexFinishImportError is invalid

[D3Hunter]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

TestAddIndexFinishImportError depends on failpoint mockFinishImportErr which is run only when disttask is disabled, after #53233 the case always panics with disttask disabled, the case pass CI because distask is enabled on default now.

[2024/05/29 13:20:54.611 +08:00] [ERROR] [misc.go:114] ["panic in the recoverable goroutine"] [label=ddl] [funcInfo=onCreateIndex] [r="runtime error: invalid memory address or nil pointer dereference"] [stack="github.com/pingcap/tidb/pkg/util.Recover
    /Users/jujiajia/code/pingcap/tidb/pkg/util/misc.go:118
runtime.gopanic
    /usr/local/go/src/runtime/panic.go:920
runtime.panicmem
    /usr/local/go/src/runtime/panic.go:261
runtime.sigpanic
    /usr/local/go/src/runtime/signal_unix.go:861
github.com/pingcap/tidb/pkg/lightning/backend.(*OpenedEngine).LocalWriter
    /Users/jujiajia/code/pingcap/tidb/pkg/lightning/backend/backend.go:307
github.com/pingcap/tidb/pkg/ddl/ingest.(*engineInfo).newWriterContext
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/ingest/engine.go:224
github.com/pingcap/tidb/pkg/ddl/ingest.(*engineInfo).CreateWriter
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/ingest/engine.go:195
github.com/pingcap/tidb/pkg/ddl.newAddIndexIngestWorker
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/index.go:1680
github.com/pingcap/tidb/pkg/ddl.(*ingestBackfillScheduler).createWorker
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/backfilling_scheduler.go:482
github.com/pingcap/tidb/pkg/ddl.(*ingestBackfillScheduler).setupWorkers.func1
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/backfilling_scheduler.go:400
github.com/pingcap/tidb/pkg/resourcemanager/pool/workerpool.(*WorkerPool[...]).runAWorker
    /Users/jujiajia/code/pingcap/tidb/pkg/resourcemanager/pool/workerpool/workerpool.go:135
github.com/pingcap/tidb/pkg/resourcemanager/pool/workerpool.(*WorkerPool[...]).Start
    /Users/jujiajia/code/pingcap/tidb/pkg/resourcemanager/pool/workerpool/workerpool.go:110
github.com/pingcap/tidb/pkg/ddl.(*ingestBackfillScheduler).setupWorkers
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/backfilling_scheduler.go:403
github.com/pingcap/tidb/pkg/ddl.(*ddlCtx).writePhysicalTableRecord
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/backfilling.go:621
github.com/pingcap/tidb/pkg/ddl.(*worker).addPhysicalTableIndex
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/index.go:1933
github.com/pingcap/tidb/pkg/ddl.(*worker).addTableIndex
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/index.go:1979
github.com/pingcap/tidb/pkg/ddl.runReorgJobAndHandleErr.func1
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/index.go:1041
github.com/pingcap/tidb/pkg/ddl.(*worker).runReorgJob.func1
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/reorg.go:205"] [stack="github.com/pingcap/tidb/pkg/util.Recover
    /Users/jujiajia/code/pingcap/tidb/pkg/util/misc.go:114
runtime.gopanic
    /usr/local/go/src/runtime/panic.go:920
runtime.panicmem
    /usr/local/go/src/runtime/panic.go:261
runtime.sigpanic
    /usr/local/go/src/runtime/signal_unix.go:861
github.com/pingcap/tidb/pkg/lightning/backend.(*OpenedEngine).LocalWriter
    /Users/jujiajia/code/pingcap/tidb/pkg/lightning/backend/backend.go:307
github.com/pingcap/tidb/pkg/ddl/ingest.(*engineInfo).newWriterContext
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/ingest/engine.go:224
github.com/pingcap/tidb/pkg/ddl/ingest.(*engineInfo).CreateWriter
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/ingest/engine.go:195
github.com/pingcap/tidb/pkg/ddl.newAddIndexIngestWorker
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/index.go:1680
github.com/pingcap/tidb/pkg/ddl.(*ingestBackfillScheduler).createWorker
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/backfilling_scheduler.go:482
github.com/pingcap/tidb/pkg/ddl.(*ingestBackfillScheduler).setupWorkers.func1
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/backfilling_scheduler.go:400
github.com/pingcap/tidb/pkg/resourcemanager/pool/workerpool.(*WorkerPool[...]).runAWorker
    /Users/jujiajia/code/pingcap/tidb/pkg/resourcemanager/pool/workerpool/workerpool.go:135
github.com/pingcap/tidb/pkg/resourcemanager/pool/workerpool.(*WorkerPool[...]).Start
    /Users/jujiajia/code/pingcap/tidb/pkg/resourcemanager/pool/workerpool/workerpool.go:110
github.com/pingcap/tidb/pkg/ddl.(*ingestBackfillScheduler).setupWorkers
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/backfilling_scheduler.go:403
github.com/pingcap/tidb/pkg/ddl.(*ddlCtx).writePhysicalTableRecord
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/backfilling.go:621
github.com/pingcap/tidb/pkg/ddl.(*worker).addPhysicalTableIndex
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/index.go:1933
github.com/pingcap/tidb/pkg/ddl.(*worker).addTableIndex
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/index.go:1979
github.com/pingcap/tidb/pkg/ddl.runReorgJobAndHandleErr.func1
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/index.go:1041
github.com/pingcap/tidb/pkg/ddl.(*worker).runReorgJob.func1
    /Users/jujiajia/code/pingcap/tidb/pkg/ddl/reorg.go:205"]

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

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

master