unstable test TestCoprocessorPriority

[hawkingrei]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

     testkit.go:94: 
        	Error Trace:	/home/jenkins/.tidb/tmp/04446c229c5a73c16deb3edddcb4db34/sandbox/processwrapper-sandbox/5006/execroot/__main__/bazel-out/k8-fastbuild/bin/executor/seqtest/seqtest_test_/seqtest_test.runfiles/__main__/executor/seqtest/testkit.go:94
        	            				/home/jenkins/.tidb/tmp/04446c229c5a73c16deb3edddcb4db34/sandbox/processwrapper-sandbox/5006/execroot/__main__/bazel-out/k8-fastbuild/bin/executor/seqtest/seqtest_test_/seqtest_test.runfiles/__main__/executor/seqtest/panic.go:482
        	            				/home/jenkins/.tidb/tmp/04446c229c5a73c16deb3edddcb4db34/sandbox/processwrapper-sandbox/5006/execroot/__main__/bazel-out/k8-fastbuild/bin/executor/seqtest/seqtest_test_/seqtest_test.runfiles/__main__/executor/seqtest/testing.go:864
        	            				/home/jenkins/.tidb/tmp/04446c229c5a73c16deb3edddcb4db34/sandbox/processwrapper-sandbox/5006/execroot/__main__/bazel-out/k8-fastbuild/bin/executor/seqtest/seqtest_test_/seqtest_test.runfiles/__main__/executor/seqtest/testkit.go:94
        	            				/home/jenkins/.tidb/tmp/04446c229c5a73c16deb3edddcb4db34/sandbox/processwrapper-sandbox/5006/execroot/__main__/bazel-out/k8-fastbuild/bin/executor/seqtest/seqtest_test_/seqtest_test.runfiles/__main__/executor/seqtest/panic.go:482
        	            				/home/jenkins/.tidb/tmp/04446c229c5a73c16deb3edddcb4db34/sandbox/processwrapper-sandbox/5006/execroot/__main__/bazel-out/k8-fastbuild/bin/executor/seqtest/seqtest_test_/seqtest_test.runfiles/__main__/executor/seqtest/testing.go:864
        	            				/home/jenkins/.tidb/tmp/04446c229c5a73c16deb3edddcb4db34/sandbox/processwrapper-sandbox/5006/execroot/__main__/bazel-out/k8-fastbuild/bin/executor/seqtest/seqtest_test_/seqtest_test.runfiles/__main__/executor/seqtest/testkit.go:173
        	            				/home/jenkins/.tidb/tmp/04446c229c5a73c16deb3edddcb4db34/sandbox/processwrapper-sandbox/5006/execroot/__main__/bazel-out/k8-fastbuild/bin/executor/seqtest/seqtest_test_/seqtest_test.runfiles/__main__/executor/seqtest/testkit.go:167
        	            				/home/jenkins/.tidb/tmp/04446c229c5a73c16deb3edddcb4db34/sandbox/processwrapper-sandbox/5006/execroot/__main__/bazel-out/k8-fastbuild/bin/executor/seqtest/seqtest_test_/seqtest_test.runfiles/__main__/executor/seqtest/testkit.go:108
        	            				/home/jenkins/.tidb/tmp/04446c229c5a73c16deb3edddcb4db34/sandbox/processwrapper-sandbox/5006/execroot/__main__/bazel-out/k8-fastbuild/bin/executor/seqtest/seqtest_test_/seqtest_test.runfiles/__main__/executor/seqtest/seq_executor_test.go:1125
        	Error:      	Received unexpected error:
        	            	[tikv:9005]Region is unavailable
        	            	github.com/pingcap/errors.AddStack
        	            		external/com_github_pingcap_errors/errors.go:174
        	            	github.com/pingcap/errors.Trace
        	            		external/com_github_pingcap_errors/juju_adaptor.go:15
        	            	github.com/pingcap/tidb/structure.(*TxStructure).Inc
        	            		structure/string.go:67
        	            	github.com/pingcap/tidb/meta.(*Meta).GenGlobalIDs
        	            		meta/meta.go:173
        	            	github.com/pingcap/tidb/ddl.(*ddl).addBatchDDLJobs2Table.func1
        	            		ddl/ddl_worker.go:384
        	            	github.com/pingcap/tidb/kv.RunInNewTxn
        	            		kv/txn.go:128
        	            	github.com/pingcap/tidb/ddl.(*ddl).addBatchDDLJobs2Table
        	            		ddl/ddl_worker.go:382
        	            	github.com/pingcap/tidb/ddl.(*ddl).addBatchDDLJobs
        	            		ddl/ddl_worker.go:298
        	            	github.com/pingcap/tidb/ddl.(*ddl).limitDDLJobs
        	            		ddl/ddl_worker.go:284
        	            	github.com/pingcap/tidb/util.(*WaitGroupWrapper).Run.func1
        	            		util/wait_group_wrapper.go:33
        	            	runtime.goexit
        	            		GOROOT/src/runtime/asm_amd64.s:1571
        	Test:       	TestCoprocessorPriority
        	Messages:   	sql:drop table t, [], error stack [tikv:9005]Region is unavailable
        	            	github.com/pingcap/errors.AddStack
        	            		external/com_github_pingcap_errors/errors.go:174
        	            	github.com/pingcap/errors.Trace
        	            		external/com_github_pingcap_errors/juju_adaptor.go:15
        	            	github.com/pingcap/tidb/structure.(*TxStructure).Inc
        	            		structure/string.go:67
        	            	github.com/pingcap/tidb/meta.(*Meta).GenGlobalIDs
        	            		meta/meta.go:173
        	            	github.com/pingcap/tidb/ddl.(*ddl).addBatchDDLJobs2Table.func1
        	            		ddl/ddl_worker.go:384
        	            	github.com/pingcap/tidb/kv.RunInNewTxn
        	            		kv/txn.go:128
        	            	github.com/pingcap/tidb/ddl.(*ddl).addBatchDDLJobs2Table
        	            		ddl/ddl_worker.go:382
        	            	github.com/pingcap/tidb/ddl.(*ddl).addBatchDDLJobs
        	            		ddl/ddl_worker.go:298
        	            	github.com/pingcap/tidb/ddl.(*ddl).limitDDLJobs
        	            		ddl/ddl_worker.go:284
        	            	github.com/pingcap/tidb/util.(*WaitGroupWrapper).Run.func1
        	            		util/wait_group_wrapper.go:33
        	            	runtime.goexit
        	            		GOROOT/src/runtime/asm_amd64.s:1571 

https://prow.pingcap.net/view/gs/pingcapprow/logs/bazel_test_tidb/1555523766249852928

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

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

[tiancaiamao]

Is it on real TiKV? @hawkingrei

[hawkingrei]

@tiancaiamao No, it runs without tikv.