flaky test TestParallelCPUProfiler

[hawkingrei]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

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

3. What did you see instead (Required)

=== RUN   TestParallelCPUProfiler
[2023/02/11 12:53:23.641 +08:00] [INFO] [cpuprofile.go:113] ["parallel cpu profiler started"]
[2023/02/11 12:53:23.642 +08:00] [ERROR] [cpuprofile.go:214] ["parallel cpu profiler panic"] [recover="send on closed channel"] [stack="github.com/pingcap/tidb/util/cpuprofile.(*parallelCPUProfiler).sendToConsumers.func1\n\tutil/cpuprofile/cpuprofile.go:214\nruntime.gopanic\n\tGOROOT/src/runtime/panic.go:884\nruntime.chansend\n\tGOROOT/src/runtime/chan.go:206\nruntime.selectnbsend\n\tGOROOT/src/runtime/chan.go:694\ngithub.mirror.nvdadr.com/pingcap/tidb/util/cpuprofile.(*parallelCPUProfiler).sendToConsumers\n\tutil/cpuprofile/cpuprofile.go:220\ngithub.mirror.nvdadr.com/pingcap/tidb/util/cpuprofile.(*parallelCPUProfiler).doProfiling\n\tutil/cpuprofile/cpuprofile.go:197\ngithub.mirror.nvdadr.com/pingcap/tidb/util/cpuprofile.(*parallelCPUProfiler).profilingLoop\n\tutil/cpuprofile/cpuprofile.go:174\ngithub.mirror.nvdadr.com/pingcap/tidb/util.WithRecovery\n\tutil/misc.go:96"]
    cpuprofile_test.go:117: 
        	Error Trace:	/home/jenkins/.tidb/tmp/63a9840cd0739f2c243bb46478607469/execroot/__main__/bazel-out/k8-fastbuild/bin/util/cpuprofile/cpuprofile_test_/cpuprofile_test.runfiles/__main__/util/cpuprofile/cpuprofile_test.go:117
        	Error:      	Received unexpected error:
        	            	cpu profiling already in use
        	Test:       	TestParallelCPUProfiler
[2023/02/11 12:53:24.058 +08:00] [INFO] [cpuprofile.go:130] ["parallel cpu profiler stopped"]
--- FAIL: TestParallelCPUProfiler (0.42s)
=== RUN   TestGetCPUProfile
[2023/02/11 12:53:24.058 +08:00] [INFO] [cpuprofile.go:113] ["parallel cpu profiler started"]
    cpuprofile_test.go:170: 
        	Error Trace:	/home/jenkins/.tidb/tmp/63a9840cd0739f2c243bb46478607469/execroot/__main__/bazel-out/k8-fastbuild/bin/util/cpuprofile/cpuprofile_test_/cpuprofile_test.runfiles/__main__/util/cpuprofile/cpuprofile_test.go:170
        	Error:      	An error is expected but got nil.
        	Test:       	TestGetCPUProfile
[2023/02/11 12:53:24.462 +08:00] [INFO] [cpuprofile.go:130] ["parallel cpu profiler stopped"]
--- FAIL: TestGetCPUProfile (0.40s)
FAIL

4. What is your TiDB version? (Required)

[hawkingrei]

https://do.pingcap.net/jenkins/blue/rest/organizations/jenkins/pipelines/pingcap/pipelines/tidb/pipelines/ghpr_unit_test/runs/16637/nodes/56/steps/61/log/?start=0