TiDB "panic in the recoverable goroutine" after flashback: runtime error: invalid memory address or nil pointer dereference

[fubinzh]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

1. 2 TiDB clusters, upstream 3 TiKV; Downstream: 4 TiKV, downstreasm TiKV cofiguration:
2. Enable log backup for upstream cluster
3. For upstream, run workload to prepare 350000 rows of data, rowwidth: ~100k
4. Perform full backup for upstream
5. Get current timestamp (TS1) of upstream, and wait log bakcup checkpoint advance to TS1
6. For upstream, run workload for 1 hour
7. Flash backup upstream to TS1
8. Run several queries to verify flash backup correctness

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

TiDB should not panic

3. What did you see instead (Required)

TiDB panic seen

{"level":"ERROR","container":"tidb","namespace":"brie-consistence-pitr-flashback-tps-7617650-1-320","pod":"upstream-tidb-0","log":"[misc.go:114] [\"panic in the recoverable goroutine\"] [label=domain] [funcInfo=updateStatsWorker] [r=\"runtime error: invalid memory address or nil pointer dereference\"] [stack=\"github.com/pingcap/tidb/pkg/util.Recover\\n\\t/workspace/source/tidb/pkg/util/misc.go:118\\nruntime.gopanic\\n\\t/usr/local/go/src/runtime/panic.go:914\\nruntime.panicmem\\n\\t/usr/local/go/src/runtime/panic.go:261\\nruntime.sigpanic\\n\\t/usr/local/go/src/runtime/signal_unix.go:861\\ngithub.com/pingcap/tidb/pkg/statistics/handle/util.(*DDLEvent).IsMemOrSysDB\\n\\t/workspace/source/tidb/pkg/statistics/handle/util/ddl_event.go:55\\ngithub.com/pingcap/tidb/pkg/statistics/handle/ddl.(*ddlHandlerImpl).HandleDDLEvent\\n\\t/workspace/source/tidb/pkg/statistics/handle/ddl/ddl.go:58\\ngithub.com/pingcap/tidb/pkg/domain.(*Domain).updateStatsWorker\\n\\t/workspace/source/tidb/pkg/domain/domain.go:2432\\ngithub.com/pingcap/tidb/pkg/domain.(*Domain).UpdateTableStatsLoop.func3\\n\\t/workspace/source/tidb/pkg/domain/domain.go:2236\\ngithub.com/pingcap/tidb/pkg/util.(*WaitGroupEnhancedWrapper).Run.func1\\n\\t/workspace/source/tidb/pkg/util/wait_group_wrapper.go:99\"]"}

4. What is your TiDB version? (Required)

["Welcome to TiDB."] ["Release Version"=v8.1.1] [Edition=Community] ["Git Commit Hash"=370bd5a5331b3c6fe51f7246f7e5e7c7efadaa58] ["Git Branch"=HEAD] ["UTC Build Time"="2024-08-07 02:23:48"]

[fubinzh]

/label affects-8.1

[Defined2014]

dup with https://github.com/pingcap/tidb/issues/52898, close this issue.