Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

6*tiflash-wn-16c/64g
1、run workload
sysbench --db-driver=mysql --mysql-user=root --mysql-host=xxx --mysql-port=4000 --mysql-password=xxx --mysql-db=xxx --order_tables=38 --update_ratio=0.1 --cop_read=0.0002 --batch_insert=0.0002 --threads=500 --report-interval=10 --time=0 c66_dc run

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

no oom

3. What did you see instead (Required)

tiflash wn oom

4. What is your TiFlash version? (Required)

sh-5.1# ./tiflash/tiflash --version
TiFlash
Release Version: v9.0.0-beta.2.pre-32-gc077d8bde
Edition: Enterprise
Git Commit Hash: c077d8b
Git Branch: HEAD
UTC Build Time: 2025-08-28 04:16:02
Enable Features: jemalloc sm4(GmSSL) mem-profiling asimd unwind thinlto next-gen hnsw.l2=sve hnsw.cosine=sve vec.l2=sve vec.cos=sve
Profile: RELWITHDEBINFO
Compiler: clang++ 17.0.6

Raft Proxy
Git Commit Hash: d467c7143a4c38ef4244647bf380f27fbd8ed78c
Git Commit Branch: HEAD
UTC Build Time: ""
Rust Version: rustc 1.77.0-nightly (89e2160c4 2023-12-27)
Storage Engine: tiflash
Prometheus Prefix: tiflash_proxy_
Profile: release
Enable Features: "raftstore-proxy/external-jemalloc" pprof-fp portable test-engine-kv-rocksdb test-engine-raft-raft-engine cloud-aws cloud-gcp cloud-azure pprof-fp portable test-engine-kv-rocksdb test-engine-raft-raft-engine cloud-aws cloud-gcp cloud-azure pprof-fp