Unstable test testPlanSerialSuite.TestPlanCacheHitInfo

[zhouqiang-cl]

Bug Report

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[2021-06-20T22:18:06.839Z] FAIL: prepare_test.go:815: testPlanSerialSuite.TestPlanCacheHitInfo

[2021-06-20T22:18:06.839Z] 

[2021-06-20T22:18:06.839Z] prepare_test.go:856:

[2021-06-20T22:18:06.839Z]     ...

[2021-06-20T22:18:06.840Z] /home/jenkins/agent/workspace/tidb-unit-test-nightly/go/src/github.com/pingcap/tidb/util/testleak/leaktest.go:168:

[2021-06-20T22:18:06.840Z]     c.Errorf("Test %s check-count %d appears to have leaked: %v", c.TestName(), cnt, g)

[2021-06-20T22:18:06.840Z] ... Error: Test testPlanSerialSuite.TestPlanCacheHitInfo check-count 50 appears to have leaked: github.com/pingcap/tidb/ddl.(*worker).start(0xc2b56d3650, 0xc0f26e5200)

[2021-06-20T22:18:06.840Z] 	/home/jenkins/agent/workspace/tidb-unit-test-nightly/go/src/github.com/pingcap/tidb/ddl/ddl_worker.go:157 +0x315

[2021-06-20T22:18:06.840Z] created by github.com/pingcap/tidb/ddl.(*ddl).Start

[2021-06-20T22:18:06.840Z] 	/home/jenkins/agent/workspace/tidb-unit-test-nightly/go/src/github.com/pingcap/tidb/ddl/ddl.go:364 +0x6a5

1. Minimal reproduce step (Required)

in ci https://ci.pingcap.net/blue/organizations/jenkins/tidb-unit-test-nightly/detail/tidb-unit-test-nightly/1444/pipeline

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

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

master 712fb1c

[zimulala]

PTAL @eurekaka

[bb7133]

I believe that this has been fixed by #26514, so close it.

[ti-srebot]

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