flaky test TestParallelCPUProfiler

[hawkingrei]

Bug Report

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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.com/pingcap/tidb/util/cpuprofile.(*parallelCPUProfiler).sendToConsumers\n\tutil/cpuprofile/cpuprofile.go:220\ngithub.com/pingcap/tidb/util/cpuprofile.(*parallelCPUProfiler).doProfiling\n\tutil/cpuprofile/cpuprofile.go:197\ngithub.com/pingcap/tidb/util/cpuprofile.(*parallelCPUProfiler).profilingLoop\n\tutil/cpuprofile/cpuprofile.go:174\ngithub.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