TiDB panic index out of range [4294967295] after long time tiup bench run #26832
Description
Bug Report
1. Minimal reproduce step (Required)
run command tiup bench tpcc --warehouses 10 --parts 10 run -T 128 -p "xxxxx" -D bench -U bencher
2. What did you expect to see? (Required)
tiup bench runs smoothly and works fine.
3. What did you see instead (Required)
TiDB is down and stderr outputs this
panic: runtime error: index out of range [4294967295] with length 1
goroutine 114089996 [running]:
github.com/pingcap/tidb/store/tikv/unionstore.(*nodeAllocator).getNode(...)
/home/jenkins/agent/workspace/optimization-build-tidb-linux-amd/go/src/github.com/pingcap/tidb/store/tikv/unionstore/memdb_arena.go:192
github.com/pingcap/tidb/store/tikv/unionstore.(*MemDB).getNode(...)
/home/jenkins/agent/workspace/optimization-build-tidb-linux-amd/go/src/github.com/pingcap/tidb/store/tikv/unionstore/memdb.go:733
github.com/pingcap/tidb/store/tikv/unionstore.memdbNodeAddr.getRight(...)
/home/jenkins/agent/workspace/optimization-build-tidb-linux-amd/go/src/github.com/pingcap/tidb/store/tikv/unionstore/memdb.go:765
github.com/pingcap/tidb/store/tikv/unionstore.(*MemDB).traverse(0xc048215c70, 0xc074bfaf90, 0x13, 0x13, 0x0, 0x60, 0x7fbc4cc25a48)
/home/jenkins/agent/workspace/optimization-build-tidb-linux-amd/go/src/github.com/pingcap/tidb/store/tikv/unionstore/memdb.go:354 +0xd31
github.com/pingcap/tidb/store/tikv/unionstore.(*MemDB).GetFlags(0xc048215c70, 0xc074bfaf90, 0x13, 0x13, 0x3569680, 0x3b9f101, 0xc074a0bb60)
/home/jenkins/agent/workspace/optimization-build-tidb-linux-amd/go/src/github.com/pingcap/tidb/store/tikv/unionstore/memdb.go:202 +0x52
github.com/pingcap/tidb/store/tikv/unionstore.(*KVUnionStore).HasPresumeKeyNotExists(0xc0005908b8, 0xc074bfaf90, 0x13, 0x13, 0x13)
/home/jenkins/agent/workspace/optimization-build-tidb-linux-amd/go/src/github.com/pingcap/tidb/store/tikv/unionstore/union_store.go:120 +0x4c
github.com/pingcap/tidb/store/tikv.actionPessimisticLock.handleSingleBatch(0xc074f003f0, 0xc0479f89a0, 0xc010b6c700, 0x2465, 0x5, 0x1bd, 0x3c05678, 0xc074c0cfc0, 0x0, 0x112fee5, ...)
/home/jenkins/agent/workspace/optimization-build-tidb-linux-amd/go/src/github.com/pingcap/tidb/store/tikv/pessimistic.go:79 +0x1c7
github.com/pingcap/tidb/store/tikv.(*batchExecutor).startWorker.func1(0xc012715dc0, 0xc074c0d0e0, 0x2465, 0x5, 0x1bd, 0x3c05678, 0xc074c0cfc0, 0x0)
/home/jenkins/agent/workspace/optimization-build-tidb-linux-amd/go/src/github.com/pingcap/tidb/store/tikv/2pc.go:1641 +0x187
created by github.com/pingcap/tidb/store/tikv.(*batchExecutor).startWorker
/home/jenkins/agent/workspace/optimization-build-tidb-linux-amd/go/src/github.com/pingcap/tidb/store/tikv/2pc.go:1624 +0x19e
4. What is your TiDB version? (Required)
Release Version: v5.1.0
Edition: Community
Git Commit Hash: 8acd5c88471cb7b4d4c4a8ed73b4d53d6833f13e
Git Branch: heads/refs/tags/v5.1.0
UTC Build Time: 2021-06-24 07:10:32
GoVersion: go1.16.4
Race Enabled: false
TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306
Check Table Before Drop: false