internal/trace: TestTraceFutileWakeup/Stress failures

[gopherbot]

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

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestTraceFutileWakeup/Stress
    trace_test.go:293: found futile wakeup on goroutine 17
--- FAIL: TestTraceFutileWakeup/Stress (2.46s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

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

2025-12-20 15:49 gotip-linux-386-longtest go@7ecb1f36 internal/trace.TestTraceFutileWakeup/Stress (log)

=== RUN   TestTraceFutileWakeup/Stress
    trace_test.go:293: found futile wakeup on goroutine 17
--- FAIL: TestTraceFutileWakeup/Stress (2.46s)

— watchflakes