unstable test testPrepareSerialSuite.TestPrepareCacheWithJoinTable

[tidb-ci-bot]

Bug Report

prepare_test.go:976:
    ...
/home/jenkins/agent/workspace/tidb-unit-test-nightly/go/src/github.com/pingcap/tidb/util/testleak/leaktest.go:168:
    c.Errorf("Test %s check-count %d appears to have leaked: %v", c.TestName(), cnt, g)
... Error: Test testPrepareSerialSuite.TestPrepareCacheWithJoinTable check-count 50 appears to have leaked: github.com/pingcap/tidb/ddl.(*worker).start(0xc246a90f50, 0xc246ab8180)
	/home/jenkins/agent/workspace/tidb-unit-test-nightly/go/src/github.com/pingcap/tidb/ddl/ddl_worker.go:157 +0x36e
created by github.com/pingcap/tidb/ddl.(*ddl).Start
	/home/jenkins/agent/workspace/tidb-unit-test-nightly/go/src/github.com/pingcap/tidb/ddl/ddl.go:353 +0x6bb

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in ci https://ci.pingcap.net/blue/organizations/jenkins/tidb-unit-test-nightly/detail/tidb-unit-test-nightly/676/pipeline/

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master dc40a09

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