unstable test FAIL: prepare_test.go:448: testPrepareSerialSuite.TestPrepareCacheForPartition

[zhouqiang-cl]

Bug Report

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[stack="github.com/pingcap/tidb/domain.(*Domain).globalBindHandleWorkerLoop.func1\n\t/home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/src/github.com/pingcap/tidb/domain/domain.go:991"]
[2021-05-31T16:48:40.148Z] 
[2021-05-31T16:48:40.148Z] ----------------------------------------------------------------------
[2021-05-31T16:48:40.148Z] FAIL: prepare_test.go:448: testPrepareSerialSuite.TestPrepareCacheForPartition
[2021-05-31T16:48:40.148Z] 
[2021-05-31T16:48:40.148Z] prepare_test.go:570:
[2021-05-31T16:48:40.148Z]     ...
[2021-05-31T16:48:40.148Z] /home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/src/github.com/pingcap/tidb/util/testleak/leaktest.go:168:
[2021-05-31T16:48:40.148Z]     c.Errorf("Test %s check-count %d appears to have leaked: %v", c.TestName(), cnt, g)
[2021-05-31T16:48:40.148Z] ... Error: Test testPrepareSerialSuite.TestPrepareCacheForPartition check-count 50 appears to have leaked: github.com/pingcap/tidb/domain.(*Domain).globalBindHandleWorkerLoop.func1(0xc107ac6f00)
[2021-05-31T16:48:40.148Z] 	/home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/src/github.com/pingcap/tidb/domain/domain.go:985 +0x162
[2021-05-31T16:48:40.148Z] created by github.com/pingcap/tidb/domain.(*Domain).globalBindHandleWorkerLoop
[2021-05-31T16:48:40.148Z] 	/home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/src/github.com/pingcap/tidb/domain/domain.go:976 +0x5f

1. Minimal reproduce step (Required)

in https://ci.pingcap.net/blue/organizations/jenkins/tidb_ghpr_unit_test/detail/tidb_ghpr_unit_test/4136/pipeline

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

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

release-5.0 e0e4d62

[zhouqiang-cl]

Happends again https://ci.pingcap.net/blue/organizations/jenkins/tidb-unit-test-nightly/detail/tidb-unit-test-nightly/1447/pipeline

[zhouqiang-cl]

happends again https://ci.pingcap.net/blue/organizations/jenkins/tidb-unit-test-nightly/detail/tidb-unit-test-nightly/2494/pipeline

[ti-srebot]

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