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Zoltán Papp
b0b52b6774
resolveOnDemand deduplicated the cache write but not the upstream lookup — a burst of concurrent queries for a freshly-learned pool-root subdomain (A + AAAA from a single getaddrinfo, or multiple peer workers dialing the same foreign relay) each hit the bypass resolver independently. Wrap the lookupRecords call in refreshGroup.Do with an 'ondemand:'- prefixed key so concurrent callers collapse into one request; the prefix namespaces this key off scheduleRefresh's keyspace so the two paths don't collide. Error and empty-result paths preserved; the cache write still runs under the existing TOCTOU-safe exists check + mutex so a winning refresh isn't clobbered.