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runtime/pprof: TestMutexProfile flakiness #19139

@randall77

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@randall77

On the builders, I see TestMutexProfile occasionally failing with

--- FAIL: TestMutexProfile (0.01s)
	pprof_test.go:532: expected 6 lines, got 3 "--- mutex:\ncycles/second=2362842166\nsampling period=1"
		--- mutex:
		cycles/second=2362842166
		sampling period=1
FAIL
FAIL	runtime/pprof	1.298s

Maybe freebsd only?

@pjweinb

Some builder logs:
https://build.golang.org/log/c625cca078dac40bc5f1f50b62891c04b52308c5
https://build.golang.org/log/118de984fc0903fe93c3e677962cd7965637a2a3

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    FrozenDueToAgeTestingAn issue that has been verified to require only test changes, not just a test failure.

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