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We can observe a data race in tests when logging after a test is finished. `b.onHealthChange` is called in a goroutine after being registered with `health.Tracker.RegisterWatcher`, which calls callbacks in `setUnhealthyLocked` in a new goroutine. See: https://github.com/tailscale/tailscale/actions/runs/9672919302/job/26686038740 Updates #12054 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Ibf22cc994965d88a9e7236544878d5373f91229e