unstable test testPrepareSerialSuite.TestConstPropAndPPDWithCache #25640
Description
Bug Report
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[2021-06-22T00:38:23.539Z] FAIL: prepare_test.go:604: testPrepareSerialSuite.TestConstPropAndPPDWithCache
[2021-06-22T00:38:23.539Z]
[2021-06-22T00:38:23.539Z] prepare_test.go:709:
[2021-06-22T00:38:23.539Z] ...
[2021-06-22T00:38:23.539Z] /home/jenkins/agent/workspace/tidb-unit-test-nightly/go/src/github.com/pingcap/tidb/util/testleak/leaktest.go:168:
[2021-06-22T00:38:23.539Z] c.Errorf("Test %s check-count %d appears to have leaked: %v", c.TestName(), cnt, g)
[2021-06-22T00:38:23.540Z] ... Error: Test testPrepareSerialSuite.TestConstPropAndPPDWithCache check-count 50 appears to have leaked: github.com/pingcap/tidb/ddl.(*worker).start(0xc323698000, 0xc321886cc0)
[2021-06-22T00:38:23.540Z] /home/jenkins/agent/workspace/tidb-unit-test-nightly/go/src/github.com/pingcap/tidb/ddl/ddl_worker.go:157 +0x315
[2021-06-22T00:38:23.540Z] created by github.com/pingcap/tidb/ddl.(*ddl).Start
[2021-06-22T00:38:23.540Z] /home/jenkins/agent/workspace/tidb-unit-test-nightly/go/src/github.com/pingcap/tidb/ddl/ddl.go:364 +0x6a5
[2021-06-22T00:38:23.540Z]
[2021-06-22T00:38:23.540Z] prepare_test.go:709:
[2021-06-22T00:38:23.540Z] ...
[2021-06-22T00:38:23.540Z] /home/jenkins/agent/workspace/tidb-unit-test-nightly/go/src/github.com/pingcap/tidb/util/testleak/leaktest.go:168:
[2021-06-22T00:38:23.540Z] c.Errorf("Test %s check-count %d appears to have leaked: %v", c.TestName(), cnt, g)
[2021-06-22T00:38:23.540Z] ... Error: Test testPrepareSerialSuite.TestConstPropAndPPDWithCache check-count 50 appears to have leaked: github.com/pingcap/tidb/ddl.(*worker).start(0xc323698070, 0xc321886cc0)
[2021-06-22T00:38:23.540Z] /home/jenkins/agent/workspace/tidb-unit-test-nightly/go/src/github.com/pingcap/tidb/ddl/ddl_worker.go:157 +0x315
[2021-06-22T00:38:23.540Z] created by github.com/pingcap/tidb/ddl.(*ddl).Start
[2021-06-22T00:38:23.540Z] /home/jenkins/agent/workspace/tidb-unit-test-nightly/go/src/github.com/pingcap/tidb/ddl/ddl.go:364 +0x6a5
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master 3a1f65a