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internal/trace: TestTraceCPUProfile/Default failures #76543

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@gopherbot
#!watchflakes
default <- pkg == "internal/trace" && test == "TestTraceCPUProfile/Default"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestTraceCPUProfile/Default
    trace_test.go:189: execution trace did not include all CPU profile samples for stack "main.cpuHog0:130|main.cpuHog1:120|main.cpuHogger:107|main.main.func1.1:44|runtime/pprof.Do:57|main.main.func1:43|main.main:50|runtime.main:289"; 8 in profile, 7 in trace
    trace_test.go:204: execution trace CPU samples:
    trace_test.go:206: 6: "main.cpuHog0:130|main.cpuHog1:120|main.cpuHogger:107|main.main.func1:49|main.main:50|runtime.main:289"
    trace_test.go:206: 1: "internal/runtime/atomic.(*Uint32).CompareAndSwap:236|runtime.casgstatus:1293|runtime.goschedImpl:4285|runtime.gosched_m:4310|runtime.mcall:313"
    trace_test.go:206: 2: "main.cpuHog0:126|main.cpuHog1:120|main.cpuHogger:107|main.main.func1:49|main.main:50|runtime.main:289"
    trace_test.go:206: 1: "runtime.traceStack:33|runtime.traceLocker.stack:66|runtime.traceLocker.GoStop:462|runtime.traceLocker.GoSched:452|runtime.goschedImpl:4282|runtime.gosched_m:4310|runtime.mcall:313"
    trace_test.go:206: 3: "main.cpuHog0:126|main.cpuHog1:120|main.cpuHogger:107|main.main.func1.1:44|runtime/pprof.Do:57|main.main.func1:43|main.main:50|runtime.main:289"
    trace_test.go:206: 1: "runtime.stdcall:962|runtime.cputicks:12|runtime.traceClockNow:60|runtime.traceWriter.event:82|runtime.traceEventWriter.event:59|runtime.traceLocker.GoStart:437|runtime.execute:3350|runtime.schedule:4190|runtime.goschedImpl:4305|runtime.gosched_m:4310|runtime.mcall:313"
    trace_test.go:206: 1: "main.cpuHog0:125|main.cpuHog1:120|main.cpuHogger:107|main.main.func1.1:44|runtime/pprof.Do:57|main.main.func1:43|main.main:50|runtime.main:289"
...
        String id=176
        	data="runtime.(*scavengerState).park"
        String id=177
        	data="C:/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgcscavenge.go"
        String id=178
        	data="runtime.bgscavenge"
        EndOfGeneration
        
    helpers.go:39: Convert this to a raw trace with `go test internal/trace/testtrace -convert in.tracetxt -out out.trace`
--- FAIL: TestTraceCPUProfile/Default (11.62s)

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NeedsInvestigationSomeone must examine and confirm this is a valid issue and not a duplicate of an existing one.compiler/runtimeIssues related to the Go compiler and/or runtime.

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