internal/trace: TestTraceStacks/Stress failures

[gopherbot]

#!watchflakes
default <- pkg == "internal/trace" && test == "TestTraceStacks/Stress"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestTraceStacks/Stress
    trace_test.go:499: no match for StateTransition Match=Goroutine Running->Runnable Stack=[]trace_test.frame{trace_test.frame{fn:"main.syncPreemptPoint", line:0}, trace_test.frame{fn:"main.main.func12", line:0}}
    trace_test.go:668: found bad trace; dumping to test log...
    trace_test.go:679: Trace Go1.25
        EventBatch gen=1 m=18446744073709551615 time=60928360429 size=25
        Sync
        Frequency freq=15625000
        ClockSnapshot dt=182 mono=3899415079059 sec=1751401571 nsec=459196432
        EventBatch gen=1 m=391301 time=60928458845 size=156
        ProcStart dt=105 p=2 p_seq=1
...
        String id=77
        	data="/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mfinal.go"
        String id=78
        	data="runtime.(*cleanupQueue).dequeue"
        String id=79
        	data="/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mcleanup.go"
        String id=80
        	data="runtime.runCleanups"
        
--- FAIL: TestTraceStacks/Stress (2.37s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "internal/trace" && test == "TestTraceStacks/Stress"

2025-06-30 16:00 go1.25-linux-amd64-longtest-aliastypeparams release-branch.go1.25@03ad694d internal/trace.TestTraceStacks/Stress (log)

=== RUN   TestTraceStacks/Stress
    trace_test.go:499: no match for StateTransition Match=Goroutine Running->Runnable Stack=[]trace_test.frame{trace_test.frame{fn:"main.syncPreemptPoint", line:0}, trace_test.frame{fn:"main.main.func12", line:0}}
    trace_test.go:668: found bad trace; dumping to test log...
    trace_test.go:679: Trace Go1.25
        EventBatch gen=1 m=18446744073709551615 time=60928360429 size=25
        Sync
        Frequency freq=15625000
        ClockSnapshot dt=182 mono=3899415079059 sec=1751401571 nsec=459196432
        EventBatch gen=1 m=391301 time=60928458845 size=156
        ProcStart dt=105 p=2 p_seq=1
...
        String id=77
        	data="/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mfinal.go"
        String id=78
        	data="runtime.(*cleanupQueue).dequeue"
        String id=79
        	data="/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mcleanup.go"
        String id=80
        	data="runtime.runCleanups"
        
--- FAIL: TestTraceStacks/Stress (2.37s)

2025-06-30 20:32 go1.25-linux-amd64-longtest-aliastypeparams release-branch.go1.25@8002d283 internal/trace.TestTraceStacks/Stress (log)

=== RUN   TestTraceStacks/Stress
    trace_test.go:499: no match for StateTransition Match=Goroutine Running->Runnable Stack=[]trace_test.frame{trace_test.frame{fn:"main.syncPreemptPoint", line:0}, trace_test.frame{fn:"main.main.func12", line:0}}
    trace_test.go:668: found bad trace; dumping to test log...
    trace_test.go:679: Trace Go1.25
        EventBatch gen=1 m=18446744073709551615 time=22541578817 size=25
        Sync
        Frequency freq=15625000
        ClockSnapshot dt=149 mono=1442661053811 sec=1751400383 nsec=271163378
        EventBatch gen=1 m=283932 time=22541773631 size=110
        ProcStart dt=151 p=1 p_seq=1
...
        String id=95
        	data="/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/preempt_amd64.s"
        String id=96
        	data="main.syncPreemptPoint"
        String id=97
        	data="main.main.func12"
        String id=98
        	data="runtime.updateMaxProcsGoroutine"
        
--- FAIL: TestTraceStacks/Stress (2.22s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "internal/trace" && test == "TestTraceStacks/Stress"

2025-07-01 17:07 gotip-linux-amd64-longtest-noswissmap go@2f653a5a internal/trace.TestTraceStacks/Stress (log)

=== RUN   TestTraceStacks/Stress
    trace_test.go:499: no match for StateTransition Match=Goroutine Running->Runnable Stack=[]trace_test.frame{trace_test.frame{fn:"main.syncPreemptPoint", line:0}, trace_test.frame{fn:"main.main.func12", line:0}}
    trace_test.go:668: found bad trace; dumping to test log...
    trace_test.go:679: Trace Go1.25
        EventBatch gen=1 m=18446744073709551615 time=2383755173 size=24
        Sync
        Frequency freq=15625000
        ClockSnapshot dt=118 mono=152560338612 sec=1751390419 nsec=948924265
        EventBatch gen=1 m=25202 time=2383824267 size=113
        ProcStart dt=139 p=1 p_seq=1
...
        String id=71
        	data="main.main.func1"
        String id=72
        	data="runtime.chansend"
        String id=73
        	data="runtime.chansend1"
        String id=74
        	data="main.main.func2"
        
--- FAIL: TestTraceStacks/Stress (2.42s)

— watchflakes