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CI unit tests can take hours due to slow/flaky testcases

type/performance

Status: Open.

#65600 In pingcap/tidb;

· wjhuang2016 opened on Jan 16, 2026

metrics: TiDB Summary dashboard shows no data due to typo in tidb_cluster variable query

affects-6.1This bug affects the 6.1.x(LTS) versions.This bug affects the 6.1.x(LTS) versions.

affects-6.5This bug affects the 6.5.x(LTS) versions.This bug affects the 6.5.x(LTS) versions.

affects-7.1This bug affects the 7.1.x(LTS) versions.This bug affects the 7.1.x(LTS) versions.

affects-7.5This bug affects the 7.5.x(LTS) versions.This bug affects the 7.5.x(LTS) versions.

affects-8.1This bug affects the 8.1.x(LTS) versions.This bug affects the 8.1.x(LTS) versions.

affects-8.5This bug affects the 8.5.x(LTS) versions.This bug affects the 8.5.x(LTS) versions.

component/metrics

contributionThis PR is from a community contributor.This PR is from a community contributor.

first-time-contributorIndicates that the PR was contributed by an external member and is a first-time contributor.Indicates that the PR was contributed by an external member and is a first-time contributor.

severity/minor

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#65589 In pingcap/tidb;

· boltandrke opened on Jan 15, 2026

DDL: Refactor DDL related Grafana dashboards

type/enhancementThe issue or PR belongs to an enhancement.The issue or PR belongs to an enhancement.

Status: Open.

#65587 In pingcap/tidb;

· fzzf678 opened on Jan 15, 2026

Bad error message <code>runtime error: index out of range [0] with length 0</code> when using <code>LOAD DATA LOCAL INFILE</code> to a table with <code>AUTO_RANDOM</code> column without <code>allow_auto_random_explicit_insert</code>

affects-8.1This bug affects the 8.1.x(LTS) versions.This bug affects the 8.1.x(LTS) versions.

affects-8.5This bug affects the 8.5.x(LTS) versions.This bug affects the 8.5.x(LTS) versions.

component/executor

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#65585 In pingcap/tidb;

· kennytm opened on Jan 15, 2026

release: v8.5.6

Status: Open.

#65584 In pingcap/tidb;

· EmmaDuDu opened on Jan 15, 2026

planner: plan cache wrongly skipped when outer-join null-reject inference involves parameters

sig/plannerSIG: PlannerSIG: Planner

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#65583 In pingcap/tidb;

· Reminiscent opened on Jan 15, 2026

Slow unit tests need to be acceralated

type/enhancementThe issue or PR belongs to an enhancement.The issue or PR belongs to an enhancement.

Status: Open.

#65581 In pingcap/tidb;

· xzhangxian1008 opened on Jan 15, 2026

Cost Model v2: <code>IndexHashJoin</code> cost underestimation

epic/cost-modelthe optimizer cost modelthe optimizer cost model

report/customerCustomers have encountered this bug.Customers have encountered this bug.

sig/plannerSIG: PlannerSIG: Planner

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#65556 In pingcap/tidb;

· Reminiscent opened on Jan 13, 2026

Resource cannot be well limited in large transactions

type/enhancementThe issue or PR belongs to an enhancement.The issue or PR belongs to an enhancement.

Status: Open.

#65554 In pingcap/tidb;

· rleungx opened on Jan 13, 2026

TiDB will record <code>StmtReset</code> and <code>StmtClose</code> as the statement latency

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#65551 In pingcap/tidb;

· YangKeao opened on Jan 13, 2026

after restarting, DDL will be blocked for a while

component/ddlThis issue is related to DDL of TiDB.This issue is related to DDL of TiDB.

severity/minor

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#65543 In pingcap/tidb;

· lance6716 opened on Jan 13, 2026

index join probe index choosing can be prior to more index keys covered when two index is not comparable

sig/plannerSIG: PlannerSIG: Planner

type/enhancementThe issue or PR belongs to an enhancement.The issue or PR belongs to an enhancement.

Status: Open.

#65531 In pingcap/tidb;

· AilinKid opened on Jan 12, 2026