Golang internal/trace: TestTraceStressStartStop/Stress failures

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

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestTraceStressStartStop/Stress
    exec.go:213: test timed out while running command: /home/swarming/.swarming/w/ir/x/w/goroot/bin/go run testdata/testprog/stress-start-stop.go
    trace_test.go:620: signal: killed
--- FAIL: TestTraceStressStartStop/Stress (766.06s)

— watchflakes

Comment From: gopherbot

Found new dashboard test flakes for:

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

2025-06-10 23:37 go1.25-linux-386-longtest release-branch.go1.25@7fa2c736 internal/trace.TestTraceStressStartStop/Stress (log)

=== RUN TestTraceStressStartStop/Stress exec.go:213: test timed out while running command: /home/swarming/.swarming/w/ir/x/w/goroot/bin/go run testdata/testprog/stress-start-stop.go trace_test.go:620: signal: killed --- FAIL: TestTraceStressStartStop/Stress (766.06s)

— watchflakes